Doxycycline for Chest Infection
Doxycycline 100mg capsules are a prescription-only tetracycline antibiotic used to treat bacterial chest infections such as bronchitis and pneumonia. It works by stopping the growth of bacteria causing the infection. This medication requires an online consultation with a UK-registered clinician to ensure it's safe and appropriate for your condition.
Select Pack Size:
| Product Name: | Doxycycline 100mg Capsules |
|---|---|
| Manufacturer: | Waymade PLC |
| Active Ingredient: | Doxycycline Hyclate |
| Administration: | Oral |
| Presentation: | Hard Capsule |
| Strength: | 100mg |
| Prescription Required: | Yes |
| Dosage Frequency: | Usually once or twice daily |
| Suitable for pregnancy? | Contraindicated |
| Use with alcohol: | Not recommended. Alcohol may reduce effectiveness and worsen side effects. |
| Strength | Package | Current Price |
|---|---|---|
| Doxycycline 100mg | 14 capsules (14 day course) Dosage: 200mg on day one (two capsules), then 100mg once daily for 12 days |
£8.95 |
| Doxycycline 100mg | 50 capsules Dosage: Flexible dosage for longer treatment courses or multiple infections |
£35.00 |
| Doxycycline 100mg | 100 capsules (2 x 50 capsules) Dosage: For extended treatment or multiple courses as prescribed |
£66.99 |
| Doxycycline 100mg is a tetracycline antibiotic prescribed to treat bacterial infections, including chest infections like bronchitis and pneumonia. It works by stopping the growth of bacteria. | ||
| This treatment requires an online consultation for review by our medical team. The decision to supply the specific treatment and quantity requested will be based on whether our medical team are satisfied that it will be safe, appropriate, and effective. | ||
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Table of Contents
- What is Doxycycline 100mg?
- What is Doxycycline 100mg Used For?
- Before Using Doxycycline 100mg
- Doxycycline Contraindications
- Special Population Considerations
- Doxycycline and Other Medicines
- Pregnancy & Breastfeeding
- Driving & Machine Operation
- Doxycycline 100mg Ingredients
- How to Use Doxycycline 100mg
- Doxycycline 100mg Dosage Guidelines
- Administration Instructions
- Missed Dose Management
- Overdose Information
- Doxycycline Side Effects
- How to Store Doxycycline
- Doxycycline 100mg Pack Information
- Doxycycline FAQs
What is Doxycycline 100mg?
Doxycycline 100mg is a broad-spectrum antibiotic belonging to the tetracycline group. Its active ingredient, doxycycline hyclate, works by inhibiting bacterial protein synthesis. Think of bacteria as factories that need to produce proteins to survive and multiply; doxycycline enters and jams the assembly line (bacterial ribosomes), preventing bacteria from building essential proteins. This action is primarily bacteriostatic (stops growth) rather than directly killing bacteria.
Mechanism of Action
Doxycycline 100mg binds to the 30S ribosomal subunit of susceptible bacteria, preventing the attachment of aminoacyl-tRNA to the mRNA-ribosome complex. This inhibits protein synthesis, which is essential for bacterial growth and reproduction. The antibiotic achieves this at concentrations that are readily achievable in human tissues while having minimal effect on mammalian cells.
Important Distinction
It is important to understand that antibiotics like doxycycline 100mg only work against bacterial infections and are ineffective against viral infections like the common cold or flu. Using them unnecessarily contributes to antibiotic resistance, a serious global health threat where bacteria become resistant to antibiotics.
What is Doxycycline 100mg Used For?
Doxycycline 100mg is prescribed to treat infections caused by susceptible bacteria. For chest infections, it is commonly used for:
Approved Indications for Chest Infections
| Condition | Typical Symptoms | Role of Doxycycline 100mg |
|---|---|---|
| Acute worsening of chronic bronchitis | Increased cough, sputum production, breathlessness in COPD patients | Treats bacterial exacerbations in patients with underlying COPD |
| Community-acquired pneumonia | Cough, fever, breathlessness, chest pain | First-line or alternative treatment, especially for atypical pneumonia |
| Acute bacterial sinusitis | Facial pain/pressure, nasal congestion, purulent nasal discharge | For moderate-severe cases or when first-line treatment fails |
Bacterial Spectrum
Doxycycline 100mg is effective against common bacteria causing chest infections including:
- Streptococcus pneumoniae
- Haemophilus influenzae
- Mycoplasma pneumoniae (atypical pneumonia)
- Chlamydophila pneumoniae
- Legionella pneumophila
EMERGENCY NOTE
Stop taking Doxycycline and seek immediate medical attention if you experience symptoms of a severe allergic reaction (swelling of face/lips/throat, difficulty breathing, severe rash), severe persistent or bloody diarrhoea, severe headache with visual changes, or a widespread severe blistering rash.
Before Using Doxycycline 100mg
During your online consultation, you will be asked about your medical history. This is crucial for safety. Please be prepared to discuss:
Medical History Assessment Checklist
- ✓ Any history of allergy to tetracyclines, doxycycline, or any medication
- ✓ Problems with your kidneys or liver
- ✓ History of intracranial hypertension (high pressure in the skull)
- ✓ Diagnosis of myasthenia gravis, systemic lupus erythematosus (SLE), or porphyria
- ✓ Tendency to get diarrhoea when taking antibiotics
- ✓ Planned surgery or dental procedures requiring anaesthetic
- ✓ Planned significant exposure to sunlight or UV light (sunbeds)
Required Baseline Considerations
Your clinician will assess whether doxycycline 100mg is appropriate for you based on:
- Age verification: Must be 8 years or older
- Pregnancy status: Must not be pregnant or planning pregnancy
- Allergy confirmation: Must not be allergic to tetracyclines
- Liver/kidney function: Assessment based on medical history
- Infection severity: Assessment through symptom description
- Previous antibiotic use: History of recent antibiotic courses
Doxycycline Contraindications
Absolute Contraindications (DO NOT USE)
- Pregnancy
- Breastfeeding
- Children under 8 years old
- Hypersensitivity to doxycycline or other tetracyclines
Relative Contraindications (Use with Extreme Caution)
| Condition | Risk Level | Precautions Required |
|---|---|---|
| Severe hepatic impairment | High | Dose adjustment required; monitor liver function |
| History of oesophagitis or swallowing difficulties | Medium | Take with plenty of water; remain upright after administration |
| Systemic lupus erythematosus (SLE) | High | Increased risk of photosensitivity; may exacerbate SLE symptoms |
| Patients taking retinoids (e.g., isotretinoin) | High | Increased risk of intracranial hypertension; avoid combination |
Special Population Considerations
Elderly Patients (≥65 years)
No specific dose adjustment is usually needed for age alone, but consider age-related kidney function decline. Age-related changes to note:
- Increased likelihood of reduced kidney function (though doxycycline is primarily excreted via GI tract)
- Side effects like oesophageal irritation may be more problematic
- Increased risk of drug interactions due to polypharmacy
- May require closer monitoring for effectiveness and side effects
Renal Impairment
- Doxycycline can be used in renal impairment as it is primarily excreted via the gastrointestinal tract
- Dose adjustment is not usually required
- No accumulation occurs in renal failure
- Considered safer than many other antibiotics in renal impairment
Hepatic Impairment
- Use with caution in severe impairment
- Dose adjustment may be necessary
- Monitor liver function during treatment
- Increased risk of hepatotoxicity in severe liver disease
Pediatric Patients
Doxycycline 100mg is contraindicated in children under 8 years due to risk of permanent tooth discolouration. For children 8-12 years (over 45kg): adult dose. Under 45kg: dose is calculated by the prescriber based on weight (2.2 mg/kg to 4.4 mg/kg per day). Use only when other antibiotics are unsuitable.
Doxycycline and Other Medicines
Always inform your clinician about ALL medicines you take, including prescriptions, over-the-counter drugs, vitamins, and herbal supplements.
High-Risk Medication Combinations
| Medication Class | Interaction with Doxycycline | Recommendation |
|---|---|---|
| Penicillin antibiotics | Can antagonise each other's antibacterial effect | Avoid concurrent use; choose one appropriate antibiotic |
| Antacids containing aluminium, calcium, magnesium | Reduces absorption of doxycycline | Take doxycycline 2 hours before or 4-6 hours after these products |
| Iron/zinc/bismuth preparations | Reduces absorption of doxycycline | Take doxycycline 2 hours before or 4-6 hours after these products |
| Warfarin/Anticoagulants | May enhance anticoagulant effect, increasing bleeding risk | Monitor INR closely; may need dose adjustment |
| Oral retinoids (e.g., isotretinoin) | Increased risk of intracranial hypertension | Avoid combination if possible; monitor for symptoms |
| Oral Contraceptives | May reduce effectiveness of hormonal contraceptives | Use additional barrier contraception during treatment and for 7 days after |
| Anticonvulsants (carbamazepine, phenytoin) | Reduce doxycycline effectiveness | May need higher doxycycline dose or alternative antibiotic |
Timing Recommendations
- Take doxycycline at least 2 hours before or 4-6 hours after antacids, iron, calcium, or magnesium supplements
- Take with plenty of water and remain upright for 30 minutes after administration
- Can be taken with food if stomach upset occurs (though absorption may be slightly reduced)
Pregnancy & Breastfeeding
Pregnancy Safety
Doxycycline 100mg is contraindicated throughout pregnancy. It can cross the placenta and cause permanent discolouration (yellow-grey-brown) of the baby's developing teeth and affect bone growth. It should not be used at any stage of pregnancy.
Category: FDA Pregnancy Category D (Positive evidence of risk)
Breastfeeding Considerations
- Doxycycline is excreted in breast milk and can affect the infant's teeth and bone development
- Do not breastfeed while taking this medicine
- If treatment is essential, breastfeeding should be discontinued during therapy
- Consider pumping and discarding milk during treatment if you wish to continue breastfeeding afterward
- Use of effective contraception is advised during treatment
Contraception Requirements
Doxycycline may reduce the effectiveness of hormonal contraceptives. Use additional barrier contraception (condoms) during doxycycline treatment and for 7 days after completion to ensure contraceptive protection.
Driving & Machine Operation
Doxycycline 100mg itself does not usually affect the ability to drive. However, some potential side effects could impair your ability to drive safely:
- Dizziness or lightheadedness
- Visual disturbances
- Severe headache (possible intracranial hypertension)
- Severe allergic reactions affecting breathing or consciousness
RECOMMENDATION: Do not drive if you feel unwell, dizzy, or experience any impairment. Wait until you know how doxycycline affects you before operating machinery or driving. If you experience severe side effects, avoid all potentially dangerous activities.
Doxycycline 100mg Ingredients
Active Ingredients
| Medication | Active Ingredient | Strength | Function |
|---|---|---|---|
| Doxycycline Capsules | Doxycycline Hyclate | 100mg per capsule | Tetracycline antibiotic - inhibits bacterial protein synthesis |
Other Ingredients (Excipients)
- Hypromellose
- Sodium lauryl sulphate
- Microcrystalline cellulose
- Magnesium stearate
- Capsule shell: Gelatin, Titanium Dioxide (E171), Brilliant Blue (E133), Iron Oxide Yellow (E172)
Allergen Warnings
TETRACYCLINE ALLERGY: Contains doxycycline, a tetracycline derivative. DO NOT USE if allergic to tetracyclines.
GELATIN: Contains gelatin derived from animals.
COLOURANTS: Contains colourants (E171, E133, E172) which may cause allergic reactions in susceptible individuals.
How to Use Doxycycline 100mg
IMPORTANT: Always follow your prescription exactly. Do not stop early even if you feel better. Incomplete courses contribute to antibiotic resistance.
Step-by-Step Administration Guide
- Wash your hands before handling medication
- Take the capsule at the time(s) instructed by your clinician
- Swallow the capsule whole with a full glass of water (at least 200ml)
- Do not chew, crush, or break the capsule
- Take while sitting or standing upright
- Do not lie down for at least 30 minutes after taking the capsule to prevent irritation or ulceration of the oesophagus
- Complete the entire prescribed course (typically 5-14 days for chest infections)
Optimal Timing Strategy
- For once daily dosing: Take at the same time each day
- For twice daily dosing: Take every 12 hours (e.g., 8am and 8pm)
- Try to take at consistent times each day
- Set reminders if needed to maintain regular dosing
Doxycycline 100mg Dosage Guidelines for Chest Infection
These are general guidelines. Your prescribed dose will be determined by the clinician based on infection severity, your weight, and medical history.
Standard Dosage Schedule
| Patient Group | Standard Dose for Chest Infection | Severe Infection Dose | Maximum Daily Dose | Duration |
|---|---|---|---|---|
| Adults, Elderly & Children ≥45kg | 200mg on day one, then 100mg once daily | 100mg twice daily | 200mg | 5-14 days typically |
| Children 8-12 years, <45kg (Dose calculated per kg) | 2.2mg - 4.4mg per kg of body weight per day, divided into 1-2 doses. | 4.4mg per kg per day | 5-14 days typically | |
Special Population Dosage Adjustments
- Renal Impairment:
- No dose adjustment typically required
- Can be used safely in renal impairment
- Monitor for side effects as usual
- Hepatic Impairment:
- Mild-moderate: Standard dose
- Severe: Use with caution; may need dose reduction
- Elderly: Standard adult dose unless severe hepatic impairment
Administration Instructions
For Optimal Effectiveness and Safety
- Complete the Course: Finish all capsules as prescribed to ensure all bacteria are killed and prevent recurrence or resistance development
- Hydration: Always take with plenty of water (at least 200ml) to help the capsule reach your stomach and prevent oesophageal irritation
- Upright Position: Remain sitting or standing for at least 30 minutes after taking to prevent capsule sticking in oesophagus
- Timing: Keep to regular intervals to maintain a constant therapeutic level of antibiotic in your body
- With Food: Can be taken with or without food. Taking with food may help reduce stomach upset
- Monitoring: Watch for improvement in symptoms and report any worsening or new symptoms to your doctor
What to Expect
- Improvement usually begins within 2-3 days
- Fever should reduce within 48 hours if antibiotic is effective
- Cough and sputum production may take longer to resolve
- Complete resolution of symptoms may take 7-14 days
STOPPING ANTIBIOTICS: Never stop antibiotics early even if you feel better. Incomplete courses allow surviving bacteria to multiply and may lead to recurrent infection or antibiotic resistance.
Missed Dose Management
It is important to take the medication as prescribed, but if you forget:
| Situation | Action | Example |
|---|---|---|
| Forgot dose, less than 6 hours late | Take as soon as remembered, then continue normal schedule | Forgot 8am dose, take at 11am, next dose at 8pm (if twice daily) |
| Forgot dose, more than 6 hours late | Skip missed dose, take next dose at regular time | Realise at 3pm you missed 8am dose, but 8pm dose due soon |
| Multiple missed doses | Contact healthcare provider for advice | Missed 2 consecutive doses |
⚠️ Important Rules
- NEVER take double dose to make up for missed dose
- NEVER take extra doses
- Take your next dose at the regular time
- If you miss multiple doses, contact your healthcare provider
Overdose Information
Symptoms of Overdose
- Severe gastrointestinal upset: nausea, vomiting, diarrhoea
- Dizziness
- Headache
- Photosensitivity reactions
- In severe cases: liver damage symptoms (jaundice, dark urine)
Immediate Actions
- Do NOT induce vomiting unless instructed by poison control
- Call 111 for NHS advice or 999 for emergency symptoms
- Contact your local poison control center
- Go to nearest A&E if advised or if severe symptoms develop
- Take medication packaging with you to hospital
EMERGENCY: If someone collapses, has seizures, or stops breathing after taking medication, call 999 immediately.
Treatment of Overdose
Management is supportive and symptomatic:
- Gastric lavage or activated charcoal if recent ingestion
- IV fluids for hydration
- Monitoring of liver function
- Symptom management as they arise
- No specific antidote exists
Doxycycline Side Effects
Like all medicines, doxycycline can cause side effects, although not everyone gets them. Most side effects are mild and temporary. Side effects are categorised by frequency:
Frequency-Based Categorisation
Common (affects up to 1 in 10 people)
- Nausea, vomiting
- Diarrhoea
- Skin sensitivity to sunlight (photosensitivity)
Uncommon (affects up to 1 in 100 people)
- Heartburn, indigestion
- Vaginal thrush (fungal infection)
- Difficulty swallowing, mouth ulcers
Rare (affects up to 1 in 1000 people)
- Visual disturbances, tinnitus (ringing in ears)
- Transient liver function changes
- Allergic skin reactions
Very Rare (affects up to 1 in 10,000 people)
- Severe allergic reactions (anaphylaxis)
- Severe skin reactions (Stevens-Johnson syndrome, DRESS)
- Intracranial hypertension (severe headache with blurred vision)
- Blood disorders
- Severe liver problems
Rare but Serious (Require Immediate Medical Attention)
STOP medication and seek URGENT medical help if you experience:
- Severe allergic reactions: Swelling of face/lips/tongue/throat, difficulty breathing, severe skin itching or rash (hives)
- Severe skin reactions: Widespread rash with blisters, peeling, mouth sores, fever (e.g., Stevens-Johnson syndrome)
- Persistent watery or bloody diarrhoea: May indicate pseudomembranous colitis
- Yellowing of skin/eyes (jaundice), dark urine, pale stools: Signs of liver problems
- Severe headache with blurred/double vision: May indicate intracranial hypertension
- Difficulty swallowing, severe heartburn: Possible oesophageal ulceration
Managing Common Side Effects
- Nausea: Take with food, eat smaller frequent meals
- Diarrhea: Stay hydrated with water or oral rehydration solutions, eat bland foods (bananas, rice, toast), consider probiotics after antibiotic course
- Photosensitivity: Use high-factor sunscreen (SPF 30+), wear protective clothing, avoid excessive sun exposure and sunbeds while taking and for a few days after stopping
- Heartburn/oesophageal irritation: Take with plenty of water, remain upright for 30 minutes after taking
Reporting Side Effects
You can report suspected side effects via the UK Yellow Card Scheme. Reporting helps improve medication safety for everyone.
How to Store Doxycycline
Storage Requirements
- Temperature: Store below 25°C
- Location: Keep in the original package to protect from moisture
- Access: Store out of sight and reach of children
- Light & Moisture: Store in a dry place; protect from light
- Security: Store in a secure place to prevent accidental ingestion
Expiry Date Check
DO NOT USE if past expiry date. Check date before starting treatment. Expired antibiotics may be ineffective or harmful. The expiry date refers to the last day of that month.
Disposal Protocol
- Return unused/expired medication to your pharmacy for safe disposal
- Do NOT flush down toilet or throw in household waste
- Keep away from pets and children
- If opened but unused, still return to pharmacy - do not save for future use
Travel Considerations
- Keep medication in original packaging when traveling
- Carry a copy of your prescription when traveling abroad
- Check airline regulations for carrying medications
- Store appropriately during travel (avoid extreme temperatures)
- Be extra cautious with sun exposure while taking doxycycline in sunny climates
Doxycycline 100mg Pack Information
Pack Sizes Available
| Strength | Pack Size | Typical Course | Price |
|---|---|---|---|
| Doxycycline 100mg | 14 capsules | 14 days (200mg day 1, then 100mg daily for 12 days) | £8.95 |
| Doxycycline 100mg | 50 capsules | Extended treatment or multiple courses | £35.00 |
| Doxycycline 100mg | 100 capsules (2 x 50) | Long-term treatment or multiple prescriptions | £66.99 |
Packaging Features
- Appearance: Green coloured hard capsules
- Pack Types: Blister packs in cardboard cartons
- Clearly labeled with medication name and strength
- Expiry date and batch number prominently displayed
- Patient information leaflet included
- Storage instructions provided
Identification
If you're unsure about your medication:
- Check the colour (green capsules)
- Verify with your pharmacist
- Never take medication that looks different than expected
- Keep in original packaging until use
Where Can I Buy Doxycycline 100mg Online in the UK
Secure Doxycycline 100mg Prescription & Next-Day Delivery Service
Order Doxycycline 100mg with confidence through our UK-registered medical prescribers, who review all requests within 4 working hours. We guarantee same-day prescription approval for eligible patients and dispatch orders placed before 3pm for next-day tracked delivery.
Our Doxycycline 100mg service combines strict adherence to NICE guidelines with competitive pricing, ensuring your antibiotic prescription is dispensed through GPhC-registered pharmacies. Every purchase includes discreet packaging and a GDPR-compliant consultation process.
Our clinical team ensures:
- Comprehensive assessment of chest infection symptoms
- Verification that bacterial infection is likely (antibiotics are not effective against viral infections)
- Drug interaction and allergy checks (especially tetracycline allergy)
- Appropriate dosage and duration prescription
- Clear instructions for use and when to seek further medical help
- Screening for contraindications (pregnancy, breastfeeding, age under 8)
Doxycycline 100mg is a prescription-only medicine. It cannot be bought over the counter in the UK. Always complete the full course as prescribed. Do not share antibiotics with others. If symptoms worsen or don't improve within 3 days, contact your doctor.
Doxycycline 100mg FAQs
Can I drink alcohol while taking Doxycycline 100mg for a chest infection?
It is not recommended. Alcohol may reduce the effectiveness of the antibiotic and could potentially worsen certain side effects like stomach upset or dizziness. It's best to avoid alcohol while taking doxycycline and while you have an active infection.
How quickly does Doxycycline 100mg work for a chest infection?
For bacterial chest infections, you should start to feel better within 2 to 3 days. However, it's crucial to complete the entire prescribed course, even if you feel better sooner, to ensure the infection is fully cleared and to prevent antibiotic resistance.
Why must I not lie down after taking the capsule?
To prevent the capsule from getting stuck or irritating your oesophagus (food pipe), which can cause painful inflammation or ulcers. Taking it with plenty of water and staying upright helps it reach your stomach quickly. Remain sitting or standing for at least 30 minutes after taking.
What should I do if I get diarrhoea while taking Doxycycline 100mg?
Mild diarrhoea is common. Ensure you drink plenty of fluids to avoid dehydration. However, if diarrhoea becomes severe, persistent, watery, or bloody, stop taking doxycycline and contact your doctor immediately, as this could be a sign of a serious bowel condition (pseudomembranous colitis).
Can I take Doxycycline 100mg if I'm allergic to penicillin?
Yes, Doxycycline is chemically unrelated to penicillin, so a penicillin allergy does not automatically mean you're allergic to Doxycycline. However, always inform your clinician of all your allergies during the consultation.
Is a 5-day or 7-day course of Doxycycline 100mg enough for a chest infection?
The duration depends on the severity and type of infection. For mild to moderate chest infections, a 5-7 day course is typical. More severe infections like pneumonia may require 7-14 days. Always follow the course length prescribed by your clinician. Never stop antibiotics early even if you feel better.
Can I get Doxycycline 100mg over the counter in the UK?
No. Doxycycline 100mg is a Prescription-Only Medicine (POM) in the UK. It cannot be bought over the counter. You must have a prescription from a qualified prescriber, such as a GP or a clinician following an online consultation, as offered by Chemist Doctor. This regulation helps prevent antibiotic misuse and resistance.
Should I take Doxycycline 100mg with food or on an empty stomach?
Doxycycline 100mg can be taken with or without food. If you experience stomach upset, taking it with food may help reduce these symptoms. However, avoid taking with dairy products, antacids, or iron supplements as they can reduce absorption. Take doxycycline 2 hours before or 4-6 hours after these products.
What should I do if I miss a dose of Doxycycline 100mg?
If you forget a dose and it's less than 6 hours late, take it as soon as you remember. If it's more than 6 hours late, skip the missed dose. Do not take a double dose to make up for a missed one. Take your next dose at the regular time. If you miss multiple doses, contact your healthcare provider.
How should I store Doxycycline 100mg capsules?
Store below 25°C in the original package to protect from moisture. Keep out of sight and reach of children. Do not use after the expiry date. Do not dispose of via wastewater or household waste. Return any unused medicine to your pharmacy for safe disposal.
Does Doxycycline 100mg affect contraceptive pills?
Yes, Doxycycline can reduce the effectiveness of combined oral contraceptive pills. You should use an additional non-hormonal method of contraception (e.g., condoms) during treatment and for 7 days after completing the course. If these 7 days run beyond the end of your pill pack, start the next pack without a break.
Why is Doxycycline not suitable for children under 8 or pregnant women?
Doxycycline binds to developing teeth and bone tissue. In children under 8 (and unborn babies), it can cause permanent yellow-grey-brown discolouration of the teeth and may temporarily slow bone growth. It is contraindicated in pregnancy and breastfeeding for these reasons.
Can I take ibuprofen or paracetamol with Doxycycline 100mg?
Generally, yes. There is no known significant interaction between Doxycycline and common painkillers like paracetamol or ibuprofen. They can be used to relieve fever or pain associated with the infection. Always check with your clinician if you're unsure about any medication combinations.
Why do I need to avoid sunlight while taking Doxycycline 100mg?
Doxycycline can make your skin more sensitive to ultraviolet (UV) light, leading to an exaggerated sunburn reaction (photosensitivity). Use a high-factor sunscreen (SPF 30+), wear protective clothing, and avoid excessive sun exposure and sunbeds while taking it and for a few days after stopping.
When should I contact a doctor while taking Doxycycline 100mg?
Contact a doctor if: symptoms don't improve within 3 days, they worsen at any time, you develop severe diarrhoea (especially if watery or bloody), you develop a rash, swelling, or breathing difficulties, you experience severe headache with visual changes, or you have any other severe side effects.
What is antibiotic resistance and how can I help prevent it?
Antibiotic resistance occurs when bacteria develop the ability to survive antibiotics. You can help prevent it by: only taking antibiotics when prescribed, completing the full course even if you feel better, never sharing antibiotics, not using leftover antibiotics, and following infection prevention measures like hand hygiene.
How is Doxycycline 100mg different from other antibiotics for chest infections?
Doxycycline 100mg is a tetracycline antibiotic effective against a broad range of bacteria including atypical organisms. It's often used for penicillin-allergic patients or for specific infections like atypical pneumonia. Unlike penicillin antibiotics, it can be taken once daily after the first day and doesn't require dose adjustment in renal impairment.
Can I travel while taking Doxycycline 100mg?
Yes, but with precautions: carry medication in original packaging, take a copy of your prescription, continue taking at regular intervals despite time zone changes, stay well-hydrated, and be extra careful about sun exposure. If traveling to sunny destinations, use high-SPF sunscreen consistently.
Medical Content Manager
Nabeel is a co-founder, and medical content manager of Chemist Doctor. He works closely with our medical team to ensure the information is accurate and up-to-date.
Medical Doctor
Dr. Talal is a GMC registered doctor and medical reviewer at Chemist Doctor. He ensures clinical accuracy and reliability across health content.
Medical Director
Usman is a co-founder, and medical director of Chemist Doctor. He leads the organisation's strategic vision, bridging clinical and operational priorities.
Review Date: 09 February 2026
Next Review: 15 August 2026
Published on: 08 February 2026
Last Updated: 09 February 2026
Getting your Doxycycline 100mg prescription is quick and easy with our simple 4-step process:
Complete Online Consultation
Fill out our secure medical questionnaire about your symptoms, medical history, allergies (especially tetracycline allergy), current medications, and pregnancy status. This takes approximately 10-15 minutes and helps us assess if doxycycline 100mg is appropriate for you.
Clinician Review
A UK-registered doctor reviews your consultation. They assess whether your symptoms suggest a bacterial chest infection requiring antibiotics and check for contraindications like pregnancy, breastfeeding, tetracycline allergy, or age under 8 years.
Prescription Decision
If appropriate, the clinician will issue a prescription for Doxycycline 100mg based on infection severity and your medical history. If not suitable, you'll receive advice on alternative options or be directed to seek in-person care.
Delivery to Your Door
Our pharmacy dispenses your Doxycycline 100mg capsules and sends them via discreet next-day delivery with full instructions for use, sun protection advice, and important safety information.
What does the online consultation involve for Doxycycline 100mg?
You'll answer questions about your chest infection symptoms (cough, sputum, fever, breathlessness), duration of symptoms, medical history, allergies (especially tetracycline allergy), current medications, pregnancy status, and any previous antibiotic use. Honest responses are vital for safe antibiotic prescribing.
How quickly will my consultation be reviewed?
Consultations are typically reviewed within a few hours during working hours (Monday-Friday 9am-5pm). Outside these hours, reviews occur the next working day. In urgent cases, we recommend contacting NHS 111 or your GP.
What if I'm not prescribed Doxycycline 100mg?
If our clinician determines that doxycycline 100mg is not appropriate (e.g., viral infection, pregnancy, tetracycline allergy, or need for different antibiotic), you'll receive a full explanation and may be offered an alternative treatment if suitable. The consultation fee will be refunded if no prescription is issued.
At Chemist Doctor, we respect your privacy and ensure complete discretion at every step of your healthcare journey.
Discreet Packaging
All orders are sent in tamper-evident, plain white boxes sealed within anonymous grey mailing bags with no external indication of medical contents. The return address shows only our pharmacy details, not medication information.
Secure Data Protection
Your personal and medical information is kept strictly confidential with end-to-end encryption and NHS Digital standard security protocols. We comply fully with UK GDPR and data protection regulations.
Private Consultations
All consultations are conducted privately by UK-registered clinicians. Your medical information is only accessible to healthcare professionals directly involved in your care and is never shared for marketing purposes.
Anonymous Billing
Credit card statements show a neutral descriptor with no reference to medications or medical services for complete privacy. We use secure payment processors with PCI DSS compliance.
Will my GP be informed about my Doxycycline 100mg prescription?
We strongly recommend informing your GP for continuity of care and safety. With your consent, we can write to your NHS GP to inform them of any prescription issued. This ensures your full medical team is aware of your treatment, which is especially important for antibiotics to avoid duplication or interactions.
How is my medical information stored and protected?
Your information is stored on secure UK-based servers with encryption both in transit and at rest. Access is restricted to authorised healthcare professionals only. We retain records in accordance with medical record-keeping requirements but you can request access or deletion in line with GDPR rights.
Can family members access my medical information?
No. Your medical information is confidential between you and your healthcare providers. We do not share information with family members unless you provide specific written consent, except in emergency situations where it is in your vital interests.
We offer reliable, tracked delivery options throughout the UK for your Doxycycline 100mg prescription:
| Service Type | Delivery Speed | Order Cut-off | Cost |
|---|---|---|---|
| Royal Mail Tracked 48 | 2-3 business days | 4pm | Free |
| Royal Mail Tracked 24 | 1-2 business days | 4pm | £3.99 |
| Next-Day Special Delivery | Next business day by 1pm | 2pm | £6.99 |
Delivery areas: We deliver to all UK mainland addresses including England, Scotland, Wales, and Northern Ireland. Deliveries require a signature upon receipt for security.
Is packaging discreet for prescription medications?
Yes. All orders are shipped in plain, unmarked packaging via tracked courier services. There is no external indication that the package contains medications, ensuring complete privacy. The package requires a signature to ensure secure delivery.
Do you deliver on weekends or bank holidays?
Standard deliveries occur Monday–Friday only. We do not ship on weekends or UK bank holidays. Next-day delivery orders placed after 2pm Friday or on weekends will be dispatched Monday for Tuesday delivery. Plan ahead to ensure you receive your medication when needed.
Can I specify delivery instructions or safe place?
Yes, you can add delivery instructions during checkout (safe place, neighbour, etc.). We recommend choosing a secure location since this contains prescription medication. For certain medications, we may require direct signature and cannot leave in safe places.
What if I'm not home when delivery is attempted?
The courier will leave a card with instructions for redelivery or collection from a local depot. You can usually rearrange delivery online or via the courier's app. Medications cannot be left with neighbours unless you have specified this in your delivery instructions.
Do you offer international delivery?
No. We only deliver within the United Kingdom. We cannot ship prescription medications internationally due to regulatory restrictions and customs regulations. If you're traveling, ensure you have sufficient medication and necessary documentation for carrying prescription medicines abroad.
Credit/Debit Cards
Visa, Mastercard, Maestro, American Express
Secure 3D authentication for all transactions
Google Pay/Apple Pay
Quick checkout using your mobile payment methods
Enhanced security with tokenisation technology
PayPal
Pay with your PayPal balance or linked cards
PayPal Pay in 3 available (subject to eligibility)
Pay in 3 by Klarna UK
3 interest-free payments based on selected pack size
First payment at checkout, then every 30 days
Subject to eligibility checks by Klarna
Clearpay Pay in 4
4 interest-free payments over 6 weeks
First payment at checkout, then every 2 weeks
Subject to eligibility checks by Clearpay
Bank Transfer
Select at checkout for unique reference details
Order processes once payment clears (1-3 business days)
We use SSL encryption and PCI DSS compliance to secure all transactions. Your payment information is protected according to the highest industry standards. Learn more in our Privacy Policy.
How long do refunds take to process for prescription medications?
Important: Due to UK regulations, dispensed prescription medications cannot be returned or refunded once dispatched. If your consultation does not result in a prescription, any consultation fee will be refunded within 3–5 business days to your original payment method. For payment issues, contact our customer service team.
Why was my order declined?
Declined orders are not charged. Common reasons include: insufficient funds, suspected fraud prevention, or failed address verification. Card authorisations release funds within 3–5 days (contact your bank for details). For instalment plans, eligibility is determined by the provider based on their credit assessment.
Can I return prescription medication?
No. UK law prohibits returns of dispensed prescription treatments for safety reasons. Once medication has been dispatched, it cannot be returned or refunded. If there is a genuine issue with your order (wrong item, damaged), contact our customer service team immediately for resolution.
How do instalment payment plans work for prescription medications?
Klarna Pay in 3: Split your purchase into 3 equal payments. First payment at checkout, remaining two collected every 30 days.
Clearpay Pay in 4: Split into 4 equal payments. First payment at checkout, remaining three collected every 2 weeks.
PayPal Pay in 3: Available through PayPal. Split into 3 payments with first at checkout and remaining two monthly.
All instalment plans are interest-free when paid on time and subject to eligibility checks by the respective providers. Late payments may incur fees.
Is my payment information secure for medical purchases?
Yes. All payments are processed through PCI DSS compliant gateways with bank-level encryption. For card payments, we never store your full card details on our servers. For digital wallets (Apple Pay/Google Pay), your actual card numbers are never shared with merchants, providing an extra layer of security through tokenisation.
Do you offer any discounts or loyalty programs?
We occasionally run promotions which will be displayed on our website. We also offer free delivery on orders over £40. For regular patients, we recommend signing up for our newsletter to receive updates on offers. We do not currently have a formal loyalty program but are considering options for future implementation.
Quick and efficient service for chest infection
"I developed bronchitis while away on business. The online consultation was straightforward, and I received my doxycycline 100mg prescription the same day. The medication arrived the next morning, and I started feeling better within 48 hours. Much quicker than trying to get a GP appointment."
Professional service with clear instructions
"The consultation asked all the right medical questions. The clinician contacted me for clarification about my symptoms before prescribing. The packaging was discreet, and instructions were clear about completing the full course and sun protection. Only minor issue was the delivery was a day later than expected."
Lifesaver when GP was fully booked
"My GP surgery had no appointments for a week. I had all the symptoms of a chest infection - fever, green phlegm, chest pain. The online service was efficient, and I was prescribed doxycycline 100mg appropriately as I'm allergic to penicillin. The clinician also advised when to seek urgent care if symptoms worsened. Very professional."
Important: These reviews are for the Chemist Doctor service overall. We do not permit individual medication reviews for prescription-only medicines as effectiveness varies by individual condition. Doxycycline 100mg is recommended by NICE guidelines for appropriate bacterial chest infections. Contact us if you have feedback about our service.
