Fexofenadine — Drug Interactions, Alcohol & Pregnancy Guide
Last reviewed: · Source: US FDA drug label database · 247CanITakeWith Editorial Team
- Fexofenadine is a Second-generation antihistamine used for Hay fever.
- Alcohol: Fexofenadine is one of the least sedating antihistamines and is generally safe with moderate alcohol — it is much less likely to cause drowsiness than older antihistamines.
- Pregnancy: Fexofenadine has limited human pregnancy data — loratadine or cetirizine are preferred choices; use fexofenadine only if these haven't worked.
About Fexofenadine
Fexofenadine is a non-sedating antihistamine. Unlike cetirizine and loratadine, its absorption is significantly reduced by fruit juices (grapefruit, orange, apple). Take with water, not juice.
Also sold as: Allegra, Telfast
Fexofenadine at a glance
Fexofenadine is classed as second-generation antihistamine and is used for hay fever, allergic rhinitis, urticaria. It can be bought over the counter in the UK, but that does not mean it is safe with everything — check the label and ask a pharmacist if you take other medicines.
Typical adult dosing guidance: 120mg once daily (hay fever); 180mg once daily (urticaria). Your own label or prescription always takes priority over general figures.
Interactions most often flagged
- Grapefruit juice
- Antacids
Before you combine Fexofenadine with anything new
- Read the patient information leaflet for both products.
- Keep one up-to-date list of every medicine and supplement you take.
- Ask a pharmacist — it is free and takes a couple of minutes.
- Seek urgent medical help if you feel seriously unwell after combining medicines.
Fexofenadine and Alcohol
Fexofenadine is one of the least sedating antihistamines and is generally safe with moderate alcohol — it is much less likely to cause drowsiness than older antihistamines.
Full guide →Fexofenadine in Pregnancy
Fexofenadine has limited human pregnancy data — loratadine or cetirizine are preferred choices; use fexofenadine only if these haven't worked.
Full guide →More in this category: allergy
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Frequently Asked Questions
What is Fexofenadine used for?
Fexofenadine is a Second-generation antihistamine used for Hay fever, Allergic rhinitis, Urticaria.
What is the maximum adult dose of Fexofenadine?
The maximum adult dose is 120mg once daily (hay fever); 180mg once daily (urticaria). This is general guidance — always follow the dose on your prescription or product label, and check with a pharmacist if you're unsure.
Can I drink alcohol with Fexofenadine?
Fexofenadine is one of the least sedating antihistamines and is generally safe with moderate alcohol — it is much less likely to cause drowsiness than older antihistamines.
Is Fexofenadine safe to take during pregnancy?
Fexofenadine has limited human pregnancy data — loratadine or cetirizine are preferred choices; use fexofenadine only if these haven't worked.
Is Fexofenadine available over the counter in the UK?
Yes, Fexofenadine is available over the counter in the UK.
What should I check before taking Fexofenadine with other medicines?
The interactions most often flagged for Fexofenadine are: grapefruit juice, antacids. Tell your pharmacist or prescriber about everything you take, including over-the-counter products, supplements and herbal remedies, before combining it with anything new.
What are the brand names for Fexofenadine?
Fexofenadine is sold under brand names including Allegra, Telfast. The active ingredient is the same, so check labels carefully to avoid doubling up on it.
Do I need a prescription for Fexofenadine?
Fexofenadine does not need a prescription in the UK, but a pharmacist can still advise whether it suits you alongside your other medicines.
Not sure if Fexofenadine is safe with your other medications?
HealthLabs.com lets you check liver enzyme or kidney function levels before combining medications long-term — no GP referral needed.
Check your levels at HealthLabs →Always speak to your pharmacist or GP for personalised medical advice. Affiliate link — we may earn a commission.