Non sedating antihistamine syrup
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.
Antihistamines work by physically blocking the H1 receptors, stopping histamine from reaching its target.
This decreases your body's reaction to allergens and therefore helps to reduce the troublesome symptoms associated with allergy.
Antihistamines are a group of medicines which act by blocking the action of the chemical called histamine in the body.
Either H1 or H2 histamine receptors can be blocked by medicines, but the group commonly known as antihistamines blocks the H1 receptor.
For example: For other conditions, specific antihistamines may be used.
If you have hay fever you may take the medicine throughout the pollen season.
(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.