Levocetirizine
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Reviewed on Jan 20, 2026. by Dr Alexandra Cristina Cowell Writer & Clinical Content Reviewer Registered with GPhC (No. 2241935) Next review due on Nov 27, 2028.
Dr Alexandra Cristina Cowell

Last updated on Jan 20, 2026.

Product info

  • Levocetirizine is a once-a-day tablet used for allergies like hay fever and hives.

  • It works by binding to your histamine receptors to stop them from causing symptoms.
  • It starts working within an hour and lasts for up to 28 hours.

Price checker

5mg
£30.95
  • Prices include:
    Express shipping

    24 hour shipping by secure courier.

  • Consultation + Access to our clinicians

    Ask our experts anything you like, any time you want.

  • Total
    £30.95
    Save £0.00 each order
Levocetirizine Levocetirizine

What is Levocetirizine?

Levocetirizine is a tablet that you take once a day to help you with common allergy conditions and symptoms, such as hay fever and hives. It’s an antihistamine, which means that it can get to work quickly to help you with your symptoms, and stays in your system for the full day.

Levocetirizine is a second generation antihistamine, so, unlike early antihistamines, it’s less unlikely that it’ll make you drowsy (although some people still do feel drowsy when they take Levocetirizine).

How does Levocetirizine work?

When your body detects something that it considers a threat, it produces a chemical called histamine to try and keep it out. In the case of allergic reactions, your body is reacting to something that it wrongly considers a threat, such as pollen.

Antihistamines, like Levocetirizine, work by binding to your histamine receptors and stopping histamine from causing your symptoms.

What doses of Levocetirizine are there?

There’s only one dose of Levocetirizine: 5mg. If it’s not working for your symptoms at this dose, please let our clinician know. You might need to try another treatment.

treated.com This page was written by The Treated Content Team.
Dr Alexandra Cristina Cowell 1218322
This page was medically reviewed by Dr Alexandra Cristina Cowell on November 27, 2025. Next review due on November 27, 2028.

How we source info.

When we present you with stats, data, opinion or a consensus, we’ll tell you where this came from. And we’ll only present data as clinically reliable if it’s come from a reputable source, such as a state or government-funded health body, a peer-reviewed medical journal, or a recognised analytics or data body. Read more in our editorial policy.

Levocetirizine Levocetirizine

How to take Levocetirizine

You should always take Levocetirizine exactly as prescribed by our clinician. It’s not recommended for children under six. To use Levocetirizine:

  • swallow the tablet whole with water
  • take it with or without food
  • the recommended dose is one tablet per day

How long does it take Levocetirizine to work?

Levocetirizine gets to work pretty quickly to treat your symptoms. You should start feeling the effects after around an hour, and it reaches its peak approximately six hours after taking it. [1] It stays in your system for around 28 hours as well, so if you take it around the same time each day it should prevent your symptoms from setting in.

What should I do if I make a mistake when taking Levocetirizine?

Taking too much Levocetirizine can be harmful for your health and give you some unpleasant side effects. Seek medical help and advice if you’ve accidentally taken too much. If you forget your dose of Levocetirizine then skip it and take your next dose at the usual time. Don’t double up on doses to make up for missed ones.

Treated trusted sources:

  1. Nettis, E., et al. (2008). Once daily levocetirizine for the treatment of allergic rhinitis and chronic idiopathic urticaria. Journal of Asthma and Allergy, 2, pp.17–23.
treated.com This page was written by The Treated Content Team.
Dr Alexandra Cristina Cowell 1218322
This page was medically reviewed by Dr Alexandra Cristina Cowell on November 27, 2025. Next review due on November 27, 2028.

How we source info.

When we present you with stats, data, opinion or a consensus, we’ll tell you where this came from. And we’ll only present data as clinically reliable if it’s come from a reputable source, such as a state or government-funded health body, a peer-reviewed medical journal, or a recognised analytics or data body. Read more in our editorial policy.

Levocetirizine Levocetirizine

Levocetirizine isn’t suitable for everyone, and there are some things that you need to be aware of when taking it.

Here’s all the official info on it. If anything is unclear, let our clinician know, and they can talk with you about it.

Levocetirizine Levocetirizine

FAQ: Levocetirizine

Have something specific you want to know? Search our info below, or ask our experts a question if you can’t find what you’re looking for.

Does Levocetirizine make you drowsy?

Answer:
Because it’s a second generation antihistamine, Levocetirizine has been formulated in a way so that it doesn’t easily cross the blood-brain barrier. As a result, unlike first generation antihistamines, it doesn’t interrupt histamine receptors in your brain, making it far less likely to cause drowsiness.[1]

Some people still get drowsy when they take Levocetirizine, though. So if you’ve taken it and feel drowsy, you should avoid driving or operating heavy machinery.

How is Levocetirizine different from other allergy treatments?

Answer:
Some allergy treatments come in the form of corticosteroids rather than antihistamines, which you may find suit you better if antihistamines make you drowsy. You can also get some hay fever or allergy treatments that come in the form of a nasal spray or eye drops, which might be more effective for you if you mainly get symptoms in either of those areas.

Is Levocetirizine similar to any other treatments?

Answer:
There is a branded equivalent of Levocetirizine, called Xyzal. This means that it contains the same active ingredient, in the same dosage. So it’ll work in much the same way as Levocetirizine to treat your symptoms, but because it’s branded, it’s usually more expensive.

Can you get Levocetirizine over the counter?

Answer:
No. Levocetirizine is a ‘prescription only medicine’. This means that you’ll need a prescription from a clinician before you can get it. If our clinician decides it’s safe and suitable for you, they can prescribe Levocetirizine to you once you’ve talked to us about your health.

Treated trusted sources:

  1. Philpot, E.E. (2000). Safety of Second Generation Antihistamines. Allergy and Asthma Proceedings, 21(1), pp.15–20.

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