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Histamine is a chemical released when the body detects something harmful, such as an infection.

It causes blood vessels to expand and the skin to swell (known as inflammation), which helps protect the body.

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Speak to a pharmacist or your GP before taking antihistamines if you're already taking other medicines.

Food and other drinks don't affect most antihistamines, but check the leaflet that comes with your medicine to make sure.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.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.

Always read the leaflet that comes with your medicine to check it's safe for you before taking it or giving it to your child.