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They're usually divided into two main groups: They also come in several different forms – including tablets, capsules, liquids, syrups, creams, lotions, gels, eye drops and nasal sprays.
There's not much evidence to suggest any particular antihistamine is better than any other at relieving allergy symptoms.
There are two kinds of histamine receptors, H1 and H2.
These receptors both receive histamine as a messenger, but the meaning conveyed is different.
Antihistamines are medicines often used to relieve symptoms of allergies, such as hay fever, hives, conjunctivitis and reactions to insect bites or stings.
They're also sometimes used to prevent motion sickness and as a short-term treatment for sleeping difficulties (insomnia).
Skin sensations local itching or burning sensation, flushing and a disagreeable heat.
You may need to try more than one type to find one that works for you.
As with any medication you take, it pays to know more about what you're putting into your body.
This discussion focuses on how antihistamines can help you, how they do it, how best to use them, and what adverse effects you may encounter in their use.
The first antihistamines were developed during World War II.
These drugs have been around for as long as penicillin and fifteen years longer than TylenolÂ®.
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First-generation antihistamines, which include diphenydramine (Benadryl) and clemastine (Tavist) cause more severe side effects (such as drowsiness) than most newer second-generation antihistamines.