- Antihistamines (H1 receptor antagonists) are commonly found in over-the-counter and prescription medications used for motion sickness, control of allergy-related itching, and cough and cold palliation and used as sleep aids
- Antihistamines are structurally related to histamine and thus inhibit the effects of histamine on H1 receptor sites.
- Antihistamines are divided into sedating and lesser sedating (previously called non-sedating including cetirizine and loratadine) types. In general, the lesser sedating antihistamines have less serious central anticholinergic symptoms because of poor penetration into the CNS and have a lower binding affinity for the . . .
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