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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.
For example: For other conditions, specific antihistamines may be used.
For example, cyclizine and promethazine teoclate are used for feeling sick (nausea) and being sick (vomiting), not for hay fever.
Generally, antihistamines have been classified into two groups: All antihistamines work pretty well to reduce symptoms of allergy.
Some of these medicines are available to buy over the counter from your pharmacist. These medicines come in a variety of forms, as mentioned above.Antihistamines are also used in the treatment of feeling sick (nausea) and being sick (vomiting).However, the exact way that they ease these symptoms is not fully understood.(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.