Walk into a community pharmacy in late April or early May and you will find a wall of hay fever tablets. Same symptoms, same outcome promised, very different prices. The choice of antihistamine is one of the most common questions pharmacists field each spring, and the honest answer is that the differences between the leading options are smaller than the packaging suggests — but they do matter for some patients.
This guide compares the main over-the-counter antihistamines available in UK pharmacies in 2026, explains how to choose, and points to when your pharmacist's input is worth asking for.
Two generations
Antihistamines are divided into two generations. First-generation antihistamines, such as chlorphenamine (Piriton) and promethazine (Phenergan), readily cross into the brain and cause drowsiness. Second-generation antihistamines, such as cetirizine, loratadine and fexofenadine, were designed to minimise that effect.
The NHS and NICE Clinical Knowledge Summary on allergic rhinitis both recommend a second-generation, non-sedating oral antihistamine as first-line treatment for most people with hay fever. First-generation products have specific niche uses but are not the first choice.
The main second-generation options
Here is how the four most commonly bought non-sedating antihistamines compare on the criteria patients ask about most.
| Name | Typical adult dose | Onset | Drowsiness | Notes |
|---|---|---|---|---|
| Cetirizine (Zirtek, Benadryl Allergy One-a-Day) | 10 mg daily | ~60 minutes | Small but real — more than loratadine | Very effective for skin itch and urticaria |
| Loratadine (Clarityn) | 10 mg daily | 1–3 hours | Minimal in most people | Long-standing first-line option |
| Fexofenadine (Telfast) | 120 mg daily (180 mg for chronic urticaria) | ~1 hour | Very low | Now available over the counter; strongest non-sedating option for many people |
| Acrivastine (Benadryl Allergy Relief) | 8 mg three times daily | ~30 minutes | Low | Faster onset, shorter duration — useful on an as-needed basis |
Dosages, onsets and drowsiness profiles are drawn from the British National Formulary and manufacturer summaries of product characteristics. Individual responses vary — what works for one person may not be the best choice for another.
How to choose
If this is your first hay fever season and you want something simple: cetirizine or loratadine as a once-daily tablet. Both cost less than a takeaway coffee for a month's supply in most UK pharmacies.
If you find cetirizine or loratadine barely helpful: ask the pharmacist about fexofenadine. It was prescription-only until a few years ago and is often the strongest non-sedating option people have tried.
If you have flare-ups rather than constant symptoms: acrivastine three times a day works faster but wears off faster. Some people prefer it for unpredictable pollen days.
If you want to stop a reaction that has already started and you are ready to sit down: chlorphenamine (Piriton) is a first-generation antihistamine that works fast but causes noticeable drowsiness. Not a choice before driving or work; sometimes useful at night.
If nasal symptoms dominate: antihistamine tablets are only one option. Intranasal steroid sprays such as fluticasone or beclometasone are often more effective for a blocked, streaming nose and can be combined with an oral antihistamine. Your pharmacist can discuss both routes.
Cost
Prices vary widely between brand and generic equivalents. In a typical 2026 UK pharmacy, a month's supply of generic cetirizine or loratadine is usually well under £5. Branded equivalents can cost several times more for the same active ingredient at the same dose. For fexofenadine, branded Telfast and generic equivalents are available, with generics generally the cheaper option.
Ask your pharmacist whether a generic version is suitable. For antihistamines, the answer is almost always yes.
Who should not self-select an antihistamine
The pharmacist will ask before supplying:
- Pregnancy or breastfeeding — loratadine and cetirizine are both commonly used in pregnancy where an antihistamine is clinically indicated, but the pharmacist will confirm.
- Children under 2 — the available over-the-counter options are limited; a pharmacist or GP referral is usually the right route.
- Severe kidney or liver disease — dose adjustments may be needed.
- Existing sedating medicines — care with combining first-generation antihistamines and other CNS depressants.
- Driving for a living — even "non-sedating" antihistamines cause drowsiness in a minority of people; occupational drivers should sample the medicine on a day off first.
Patients with uncontrolled hay fever despite several antihistamine tries, or those whose symptoms include significant asthma flare-ups, should be referred back to their GP for a broader review.
Nasal sprays, eye drops and combinations
Antihistamine tablets are rarely enough by themselves for severe hay fever. The NICE stepped approach is:
- An intranasal corticosteroid (fluticasone, beclometasone, mometasone) applied consistently through the season
- Plus an oral second-generation antihistamine for itch, sneezing and eye symptoms
- Plus eye drops (sodium cromoglicate or similar) where eye symptoms persist
For the eye-drop side of that combination, see the conjunctivitis treatment guide.
Chronic urticaria and other uses
Antihistamines are not only for hay fever. They are also the first-line treatment for chronic urticaria — long-standing hives of unknown cause — and are used in a range of other allergy-related conditions. Fexofenadine at 180 mg daily is specifically licensed for chronic urticaria in adults.
If you have recurrent, unexplained hives rather than seasonal hay fever, your pharmacist may recommend a longer trial of a second-generation antihistamine and a GP review to investigate the underlying cause.
The pharmacy conversation
A 60-second chat with the pharmacist is often more useful than a 20-minute scroll through product reviews. You get:
- a steer on which active ingredient matches your symptom pattern
- confirmation of whether a generic is identical to the brand
- a check against any other medicines you take
- an honest answer on what to do if the first try does not work
For most hay fever sufferers, the pharmacist's most common recommendation in 2026 is a generic once-daily loratadine or cetirizine, plus an intranasal steroid spray if nasal symptoms dominate. For the minority who do not get enough relief from that combination, fexofenadine is the usual step-up. Anything more than that is a conversation with a GP.
To find a pharmacy near you, use the PharmSee directory.
Sources
- NHS — Antihistamines (nhs.uk)
- NICE Clinical Knowledge Summary — Allergic rhinitis
- British National Formulary — Second-generation antihistamines
- Manufacturer Summaries of Product Characteristics for cetirizine, loratadine, fexofenadine, acrivastine
PharmSee provides UK pharmacy consumer health guides based on NHS and NICE clinical information.