How To Use Levocetirizine
Complete Step‑by‑Step Usage Guide, Dosage Instructions & Safety Information
Table of Contents
Key Takeaways: How to Use Levocetirizine Correctly
- Standard dose: Adults and children over 6 years: one 5 mg tablet once daily.
- Renal adjustment: Reduce dose if creatinine clearance below 50 mL/min; contraindicated if on dialysis.
- Administration: Swallow whole with water; can be taken with or without food.
- Missed dose: Skip the missed dose – never double the next dose.
- Special groups: Use in pregnancy only if clearly needed; caution in breastfeeding, epilepsy, or urinary retention.
Levocetirizine is a once‑daily non‑sedating antihistamine. Using it correctly ensures optimal symptom control and minimises side effects. Follow this guide for safe and effective use.
Important Medical Advice
If you accidentally take more than the prescribed dose and experience drowsiness (especially in children, who may show agitation then drowsiness), contact your doctor or NHS 111 immediately. Stop levocetirizine and seek urgent help if you develop swelling of the lips, face, or throat, or difficulty breathing – these are signs of a serious allergic reaction.
How to Take Levocetirizine: Step‑by‑Step Guide
- Check the tablet: Levocetirizine 5 mg film‑coated tablets are white, oval, and may have a break line (for splitting only if your doctor advises; usually the whole tablet is taken).
- Swallow whole: Take the tablet with a glass of water. Do not crush or chew it – the film coating ensures correct release and masks taste.
- Timing: Take at the same time each day. Many people prefer the evening to reduce awareness of any mild drowsiness.
- With or without food: Levocetirizine can be taken either way. If you notice stomach discomfort, take it with a meal.
- If you forget: Skip the forgotten dose. Take the next dose at the regular time. Never take two doses together.
🗒️ Practical tip: Setting a daily alarm can help you remember your dose. The tablet can be taken on an empty stomach for faster absorption if quick relief is needed.
Levocetirizine Dosage Guide
Always follow your doctor’s prescription. The following are standard doses based on the PIL and BNF NICE.
| Population | Dose | Notes |
|---|---|---|
| Adults (≥18 years) | 5 mg once daily | If no response after a few days, review by doctor needed |
| Children 6–17 years | 5 mg once daily | For children under 6 years, alternative formulations (drops) are available – consult doctor |
| Elderly (with normal renal function) | 5 mg once daily | No dose adjustment required |
| Renal impairment (CrCl 30–50 mL/min) | 5 mg every other day | Reduce frequency based on CrCl |
| Renal impairment (CrCl <30 mL/min) | 5 mg twice weekly | Severe impairment – avoid if possible |
| End‑stage renal disease (dialysis) | Contraindicated | Not removed by dialysis |
| Hepatic impairment only | Standard dose | No change needed |
⚠️ Important: Dose adjustments for renal impairment are based on creatinine clearance. Your doctor may calculate this from a recent blood test.
Who Should Use Levocetirizine
Levocetirizine is suitable for adults and children aged 6 years and older who need relief from:
- Allergic rhinitis (seasonal hay fever or perennial allergies) – symptoms include sneezing, runny or itchy nose, and itchy/watery eyes.
- Chronic urticaria (nettle rash) – to reduce itching and the number of hives.
It is particularly useful for people who require a once‑daily, non‑sedating antihistamine with a fast onset (within 1 hour) and 24‑hour duration.
Who Should NOT Use Levocetirizine
- Allergy to levocetirizine, cetirizine, hydroxyzine, or any tablet ingredient (e.g., lactose – see section 6 of PIL).
- Severe kidney disease requiring dialysis (contraindicated).
- Children under 6 years (tablet strength not suitable; use paediatric drops under medical supervision).
- Epilepsy or risk of seizures – use with caution, as antihistamines may rarely aggravate seizures.
- Urinary retention conditions (e.g., spinal cord lesions, enlarged prostate) – levocetirizine may worsen retention.
Always discuss your full medical history with your doctor before starting.
Should Levocetirizine Be Taken with Food or Without?
Levocetirizine can be taken either with food or on an empty stomach. Food delays the time to peak concentration (Tmax increases by about 1.5 hours) but does not reduce the total amount absorbed (AUC unchanged). For most people, this delay is clinically insignificant. If you have a sensitive stomach, taking it with a meal may reduce any mild gastrointestinal discomfort.
Alcohol: Although levocetirizine has minimal interaction with alcohol, it may potentiate sedation in susceptible individuals. It is advisable to limit alcohol intake while taking this medicine.
Special Conditions: Pregnancy, Breastfeeding & Specific Populations
Pregnancy: Data on levocetirizine use in pregnant women are limited. Animal studies do not indicate direct or indirect harmful effects. As a precaution, it is best to avoid use during pregnancy unless the benefit clearly outweighs the risk. Discuss with your doctor.
Breastfeeding: Levocetirizine passes into breast milk in small amounts. Because of the potential for sedation in the infant, it should be used with caution in nursing mothers, and only after consulting a healthcare professional.
Elderly: With normal kidney function, no dose adjustment needed. However, elderly patients are more likely to have reduced renal function, so a dose check is prudent.
Children: Licensed from 6 years. For younger children, alternative formulations (oral drops) are available – consult your GP or pharmacist.
Driving and machinery: Some individuals may experience drowsiness. Do not drive or operate tools until you know how levocetirizine affects you.
Levocetirizine FAQs
How long does it take for levocetirizine to start working?
Levocetirizine begins to relieve symptoms within 1 hour of taking the tablet. Maximum effect is usually reached after 2‑4 hours.
Can I take levocetirizine every day?
Yes, levocetirizine is safe for long‑term daily use in persistent allergies, such as perennial rhinitis or chronic urticaria, under medical supervision.
What should I do if I miss a dose?
If you forget to take your dose, skip it completely. Take your next dose at the regular time. Do not take two doses to make up for a missed one.
Can I drink alcohol while on levocetirizine?
Alcohol is best avoided or limited, as it may increase the chance of drowsiness or reduced alertness in sensitive individuals.
Is levocetirizine the same as cetirizine?
Levocetirizine is the purified active component (R‑enantiomer) of cetirizine. It is twice as potent at the H1 receptor and has slightly faster onset, but both are effective antihistamines.
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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: 11 March 2026
Next Review: 11 September 2026
Published on: 11 March 2026
Last Updated: 11 March 2026