The least sedating of the antihistamines, and the one used at higher doses for stubborn hives.
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Fexofenadine is a second-generation antihistamine that blocks H1 receptors, preventing histamine from producing itching, sneezing, runny nose and hives.
It is the active metabolite of an older drug, terfenadine, which was withdrawn over heart rhythm effects. Fexofenadine has none of those effects, which is part of why it has such a clean safety record.
It crosses into the brain less than any other common antihistamine, which makes it the least sedating of the group — a genuine advantage for drivers, shift workers and students.
UK and European guidance supports increasing antihistamines up to four times the standard dose for chronic urticaria that has not responded. That is a deliberate, evidence-based step — but it should be done on advice rather than by taking extra packets.
Begin two weeks before your season starts and take it daily, rather than reacting to symptoms. Antihistamines work far better as prevention.
Fexofenadine is among the best tolerated medicines in common use.
Even at the higher doses used for hives, tolerability generally remains good.
There are very few restrictions. In pregnancy, loratadine and cetirizine have the larger safety datasets and are usually preferred, so tell us if you are or might be pregnant.
No monitoring is required.
Chronic hives with weight loss, fever, joint pain or bruising warrants blood tests rather than dose escalation, since it can occasionally reflect something systemic.
Fexofenadine 120mg is available over the counter, so for straightforward hay fever a pharmacy is cheaper and faster. We will say so rather than take a fee for it.
Where a consultation is genuinely worth it is chronic hives — urticaria lasting more than six weeks. That warrants a different approach: higher doses than the packet allows, a check for underlying causes, and a plan rather than a repeat purchase.
It is also worth a conversation if hay fever is not responding, because the usual reason is that a steroid nasal spray is missing or being used wrongly, not that the antihistamine is too weak.
Fexofenadine 120mg is sold over the counter and own-brand versions are inexpensive. The 180mg strength for hives requires a prescription in some circumstances.
Branded versions cost several times more than generic ones for the identical drug.
Buying a season's supply at once is considerably cheaper than a packet at a time, and hay fever treatment is meant to be taken daily through the season rather than occasionally.
Can be stopped at any time without tapering. For seasonal hay fever, continue through your season rather than stopping when symptoms briefly settle.
The answer is usually not a stronger antihistamine. Work through this order instead:
Individual response varies more than the drug classification suggests. Cetirizine, loratadine and fexofenadine are all reasonable, and someone who does poorly on one often does well on another.
Not on your own initiative — but for chronic hives, a doctor may well advise exactly that.
The distinction matters. For hay fever, doubling the dose does not help; 120mg daily is the ceiling of useful effect and more simply costs more. If hay fever is not controlled, the missing piece is almost always a steroid nasal spray, not more antihistamine.
For chronic urticaria — hives lasting more than six weeks — UK and European guidance explicitly supports increasing a non-sedating antihistamine to up to four times the standard dose, so 180mg twice daily is within recognised practice, and 720mg daily is the documented ceiling. Fexofenadine is one of the safest antihistamines to escalate because it barely enters the brain, so drowsiness does not climb with the dose the way it would with cetirizine.
Why it still needs a conversation: hives lasting six weeks with weight loss, fever, joint pain or bruising is a different problem that needs blood tests, not a bigger dose. And the packet will tell you not to exceed one tablet, because off-label escalation is a prescribing decision rather than a consumer one.
Fexofenadine. Cetirizine causes drowsiness in a minority; loratadine sits between the two.
Fruit juices block the transporter that absorbs it, and can reduce the amount reaching your bloodstream substantially. Water is the sensible choice.
Loratadine and cetirizine have more pregnancy data and are usually preferred. Ask before continuing.
Most often because treatment started late. Once the nose is inflamed it takes far longer to settle than it takes to prevent — which is the entire argument for starting two weeks early.
Clinically reviewed by Dr Mohammad Zubair Khan, GMC 7563469
Last reviewed
August 30, 2026
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