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Nitrates are one of a type of drug known as vasodilators, that are used to treat angina in people with coronary artery disease or chest pain caused by blocked blood vessels of the heart. They work to control angina by relaxing the coronary arteries so blood can flow more easily to the heart.
There are direct-acting cholinergic drugs and indirect cholinergic drugs. The direct-acting cholinergic drugs act on the receptors to activate a tissue response and the indirect-acting cholinergic drugs inhibit the action of the enzyme cholinesterase by forming a chemical complex.here are direct-acting cholinergic drugs and indirect cholinergic drugs. The direct-acting cholinergic drugs act on the receptors to activate a tissue response and the indirect-acting cholinergic drugs inhibit the action of the enzyme cholinesterase by forming a chemical complex.