Sedating over the counter
Agents blocking H2 receptors, used to inhibit gastric secretion in peptic ulcer, are usually called substance capable of reducing the physiological and pharmacological effects of histamine, including a wide variety of drugs that block histamine receptors.Many such drugs are readily available as over-the-counter medicines for the management of allergies.These side effects present a special hazard in driving an automobile or operating heavy machinery.Other side effects include dryness of the mouth and throat and insomnia.) an agent that counteracts the action of histamine; usually used for agents blocking H1 receptors (H) and used to treat allergic reactions and as components of cough and cold preparations.See hypersensitivity; mast cell stabilizers.a drug that counteracts the effects of histamine by acting on histamine receptors without activating them but preventing their accessibility to histamine. There are two types: receptors are commonly referred to as the antihistamines and are widely used to relieve the symptoms of allergic reactions, especially urticaria.
Many are ingredients of compound preparations used to treat coughs or the common cold.Patients for whom an antihistamine has been prescribed should be instructed about the side effects of these drugs, including drowsiness, dizziness, and muscular weakness.Antihistamine drugs fall into two groups-those that block H receptor blockers include diphenhydramine, chlorpheniramine (chlorphenamine) (Piriton), terfenadine (Triludan), promethazine (Phenergan), cyproheptadine (Periactin), mequitazine (Primalan) and phenindamine (Thephorin).HAny substance that reduces the effect of histamine or blocks histamine receptors, usually the histamine 1 (H1) receptor.
Toxicity resulting from the overuse of antihistamines and their accidental ingestion by children is common and sometimes fatal.
These substances do not completely stop the release of histamine, and the ways in which they act on the central nervous system are not completely understood.