Antihistamines are commonly used to treat the symptoms of allergies and reactions to bites and stings.Antihistamines generally come as tablets, creams, ointments and eye drops to reduce conditions such as watering, itchy eyes, running, itchy nose, sneezing, swelling and irritation of the eys, and to reduce hives, nettle rash and other allergic reactions.But types that make you feel sleepy may be better if your symptoms affect your sleep.Ask a pharmacist for advice if you're unsure which medicine to try, not all antihistamines are suitable for everyone.
It then produces histamine, which causes symptoms such as rashes, a runny nose and/or sneezing.
Most antihistamines can be bought from pharmacies and shops, but some are only available on prescription.
They also come in several different forms – including tablets, capsules, liquids, syrups, creams, lotions, gels, eye drops and nasal sprays.
You may need to try more than one type to find one that works for you.
Non-drowsy antihistamines are generally the best option, as they're less likely to make you feel sleepy.
The NICE British National Formulary (BNF) sites is only available to users in the UK, Crown Dependencies and British Overseas Territories.