Side effects of sedating antihistamines

Generally, antihistamines have been classified into two groups: All antihistamines work pretty well to reduce symptoms of allergy.Your doctor or pharmacist may advise or prescribe a particular antihistamine depending on the cause of your allergy and on whether you require a sedating or non-sedating medicine.The brain has several key areas which control vomiting.It is thought that antihistamines block H1 receptors in the area of the brain which creates nausea in response to chemicals in the body.

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For example, cyclizine and promethazine teoclate are used for feeling sick (nausea) and being sick (vomiting), not for hay fever.

Chlorphenamine is the antihistamine most used in an emergency situation such as anaphylaxis, and may be given by injection in this situation.

Diphenhydramine (Nytol®) is sold over the counter as a sleep remedy.

(Mucosae are membranes lining body cavities such as your mouth, nose and digestive tract.) If your skin is damaged or your immune system detects a foreign substance, histamine is released from mast cells.

The histamine binds to special sites (receptors) on other cells, called H1 receptors.

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