Qlaira Side Effects: Complete Safety Guide
When Do Side Effects Start? How Long Do They Last? Timeline, Contraindications & Food Interactions
Key Takeaways: Qlaira Side Effects
- Common side effects (1‑10%): Headache, nausea, breast discomfort, irregular bleeding, acne, weight gain. Usually improve within 3 months.
- Serious but rare: Blood clots (VTE), stroke, heart attack, liver tumours. Know the warning signs.
- Onset: Most side effects begin in the first few weeks; bleeding irregularities can occur early and settle.
- Duration: Transient side effects often resolve by cycle 3. If they persist or worsen, consult your doctor.
- Contraindications: History of blood clots, migraine with aura, liver disease, hormone‑sensitive cancer, unexplained bleeding.
Qlaira is an effective combined contraceptive pill, but like all medicines, it can cause side effects. Understanding what to expect and when to seek help ensures safe use.
When to Seek URGENT Medical Attention
Stop Qlaira and contact a doctor immediately if you experience: sudden leg swelling/pain (possible DVT), chest pain or breathlessness (possible PE), severe headache, vision loss, or severe upper abdominal pain. These could be signs of a blood clot or other serious condition.
What are Qlaira Side Effects?
Side effects are categorised by how often they occur. The following frequencies are based on clinical trial data and post‑marketing experience (from the PIL).
Common (affects 1 to 10 in 100 users)
- Headache
- Abdominal pain, nausea
- Acne
- Breast discomfort, painful periods, irregular bleeding (including heavy irregular bleeding)
- Weight gain
Uncommon (affects 1 to 10 in 1,000 users)
- Fungal infections, vaginal infections
- Increased appetite
- Depression, mood swings, decreased libido
- Dizziness, migraine
- Hot flushes, high blood pressure
- Diarrhoea, vomiting
- Hair loss, excessive sweating, itching, rash
- Muscle cramps
- Swollen breasts, ovarian cyst, pelvic pain
- Fatigue, irritability, ankle swelling (oedema)
Rare (affects 1 to 10 in 10,000 users)
- Serious blood clots: deep vein thrombosis (DVT), pulmonary embolism (PE), heart attack, stroke, transient ischaemic attack (TIA)
- Liver tumours (benign or malignant)
- Gallbladder inflammation
- Chloasma (brown patches on skin)
- Angioedema (sudden swelling of face, lips, throat)
- Breast cancer (very rare; studies show slight increased risk in pill users)
🗒️ Note: The overall risk of a serious blood clot with Qlaira is small but higher than non‑users. See section 2 of the PIL for detailed risk information.
When Do Qlaira Side Effects Start?
Most side effects appear within the first few cycles as your body adjusts to the hormones.
- Immediate (first days): Nausea, headache, breast tenderness may occur within the first week of starting.
- First 1‑3 months: Irregular bleeding, spotting, mood changes, and acne are common during this adjustment period.
- Later (after 3 months): If side effects persist beyond 3 months, they are less likely to resolve spontaneously; discuss with your doctor.
Serious side effects like blood clots can occur at any time, but the risk is highest during the first year of use or when restarting after a break of 4+ weeks.
How Long Do Qlaira Side Effects Last?
The duration varies by individual and the specific side effect.
- Transient effects: Nausea, headache, and breast tenderness usually improve within a few days to weeks as your body acclimatises.
- Bleeding irregularities: Spotting or breakthrough bleeding often settles by cycle 3. If it continues beyond 3 months, further investigation may be needed.
- Mood changes: May persist or fluctuate; if depression becomes severe, consult your doctor.
- Weight gain: Can be gradual; if rapid or excessive, consider other causes.
- Serious events (blood clots): Require immediate treatment and stopping Qlaira permanently.
Most non‑serious side effects resolve within 3 cycles. If they bother you or persist, your doctor may suggest an alternative pill.
Qlaira Side Effects Timeline
| Time period | Common experiences | What to do |
|---|---|---|
| Week 1‑2 | Nausea, headache, breast tenderness, mild spotting | Take with food; use pain relief if needed; spotting usually harmless |
| Month 1‑3 | Irregular bleeding, mood swings, acne, bloating | Track symptoms; most settle by month 3; use condoms if bleeding causes concern |
| Month 4‑6 | Cycle should become regular; bleeding lighter | If still irregular, see GP |
| Long‑term (over 6 months) | Possible weight changes, persistent acne, or mood issues | Discuss alternative pill with doctor |
This timeline is a guide; every woman's response is unique. Always report any severe or persistent symptoms.
Contraindications: Who Should NOT Take Qlaira
Qlaira should not be used if any of the following apply (adapted from the PIL):
- Current or past blood clot in a vein (DVT) or artery (heart attack, stroke).
- Known clotting disorder (e.g., protein C/S deficiency, Factor V Leiden).
- Need for major surgery or prolonged immobilisation.
- Angina pectoris or transient ischaemic attack (TIA).
- Migraine with aura (focal neurological symptoms).
- Severe diabetes with vascular changes, very high blood pressure, or severe dyslipidaemia.
- Liver disease (if liver function not yet normal).
- Liver tumours (benign or malignant).
- Known or suspected hormone‑sensitive cancer (e.g., breast, genital).
- Unexplained vaginal bleeding.
- Hypersensitivity to any ingredient.
- Pregnancy or suspected pregnancy.
Also, discuss with your doctor if you have conditions like depression, Crohn’s disease, SLE, or are overweight (BMI >30).
Food & Drug Interactions
Food interactions
Qlaira can be taken with or without food. However, grapefruit juice may increase oestrogen levels by inhibiting CYP3A4, potentially increasing side effects. It's best to avoid large quantities.
Drug interactions that reduce efficacy
- Liver enzyme inducers (e.g., rifampicin, carbamazepine, phenytoin, barbiturates, griseofulvin, St John's wort): May accelerate hormone breakdown, reducing contraceptive effect and causing breakthrough bleeding. Use additional contraception during and for 28 days after stopping.
- Some HIV/HCV medications: (e.g., ritonavir, boceprevir, telaprevir) – may affect hormone levels.
Drug interactions that increase side effects
- CYP3A4 inhibitors (e.g., ketoconazole, itraconazole, erythromycin): May increase hormone levels, possibly worsening side effects like nausea, breast tenderness.
Other interactions
- Lamotrigine (anti‑epileptic): Qlaira may reduce lamotrigine levels, increasing seizure risk. Monitor levels.
- Cyclosporin: Levels may increase; monitor.
Always tell your doctor or pharmacist about all medicines and herbal products you take.
Qlaira Side Effects FAQs
Will I definitely gain weight on Qlaira?
Not necessarily. Weight gain is a common side effect (1‑10% of users), but many women do not experience it. If you do, it's usually modest and may stabilise.
Can Qlaira cause depression?
Some women report mood changes or depression. If you feel persistently low, anxious, or have thoughts of self‑harm, speak to your doctor immediately.
When should I worry about irregular bleeding?
Spotting is normal in the first 3 months. If bleeding is heavy, prolonged, or occurs after you've been regular, see your doctor to rule out other causes.
Can I take antibiotics with Qlaira?
Most antibiotics (except rifampicin/rifabutin) do not affect Qlaira. However, if you get diarrhoea or vomiting with antibiotics, follow missed pill advice. Use condoms for 7 days after illness.
Does Qlaira increase my risk of blood clots?
Yes, like all combined pills, Qlaira slightly increases the risk of VTE compared to non‑users. The risk is highest in the first year. Your doctor will assess your personal risk before prescribing.
Need a Prescription or Advice on Qlaira?
Our UK‑registered doctors can review your suitability for Qlaira or help manage side effects if you're already taking it.
Secure Prescription & Next‑Day Delivery
MHRA‑compliant | GPhC‑registered pharmacy | Discreet packaging | UK‑registered doctors
Start Contraception ConsultationRelated Qlaira Guides
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. Feroz is a GMC-registered doctor and a medical reviewer at Chemist Doctor. He oversees acute condition and urgent care guidance.
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: 17 March 2026
Next Review: 17 September 2026
Published on: 17 March 2026
Last Updated: 17 March 2026