ChEBI

Histamine antagonists are the drugs that bind to but do not activate histamine receptors, thereby blocking the actions of histamine or histamine agonists.

Any drug that binds to but does not activate cholinergic receptors, thereby blocking the actions of acetylcholine or cholinergic agonists.

A loosely defined group of drugs that tend to reduce the activity of the central nervous system.

Any member of a group of drugs that reversibly inhibit the propagation of signals along nerves. Wide variations in potency, stability, toxicity, water-solubility and duration of action determine the route used for administration, e.g. topical, intravenous, epidural or spinal block.

Histamine antagonists are the drugs that bind to but do not activate histamine receptors, thereby blocking the actions of histamine or histamine agonists.

Any drug that binds to but does not activate cholinergic receptors, thereby blocking the actions of acetylcholine or cholinergic agonists.

A drug used to prevent nausea or vomiting. An antiemetic may act by a wide range of mechanisms: it might affect the medullary control centres (the vomiting centre and the chemoreceptive trigger zone) or affect the peripheral receptors.