how long to take it for – some types can be used for a long time, but some are only recommended for a few days.when to take it – including how many times a day you can take it and when to take it (some types should be taken before bedtime).how much to take (the dose) – this can vary depending on things such as your age and weight.
how to take it – including whether it needs to be taken with water or food, or how to use it correctly (if eyedrops or a nasal spray).Take your medicine as advised by the pharmacist or doctor, or as described in the leaflet that comes with it.īefore taking an antihistamine, you should know: But types that make you feel sleepy may be better if your symptoms stop you sleeping.Īsk a pharmacist for advice if you're unsure which medicine to try as not all antihistamines are suitable for everyone. Non-drowsy antihistamines are generally the best option, as they're less likely to make you feel sleepy. You may need to try several types to find one that works for you. Some people find certain types work well for them and others do not. There's not much evidence to suggest any particular antihistamine is better than any other at relieving allergy symptoms. They also come in several different forms – including tablets, capsules, liquids, syrups, creams, lotions, gels, eyedrops and nasal sprays. non-drowsy antihistamines that are less likely to make you feel sleepy – such as acrivastine, cetirizine, fexofenadine and loratadine.antihistamines that make you feel sleepy – such as chlorphenamine (Piriton), cinnarizine, diphenhydramine, hydroxyzine and promethazine.They're usually divided into 2 main groups: Most antihistamines can be bought from pharmacies and shops, but some are only available on prescription. They're also sometimes used to prevent motion sickness and as a short-term treatment for insomnia. Antihistamines are medicines often used to relieve symptoms of allergies, such as hay fever, hives, conjunctivitis and reactions to insect bites or stings.