It is used in the form of atropine sulfate because this compound has much greater solubility in water.
Atropine sulfate is an anticholinergic drug.
The tablets also contain corn starch, lactose, magnesium stearate, sucrose, and talc. The most important therapeutic action is the inhibition of smooth muscle and glands innervated by postganglionic cholinergic nerves. This effect is manifested by mild central vagal excitation and moderate respiratory stimulation. In addition to its effect on the central nervous system, atropine sulfate acts peripherally as a competitive antagonist of the muscarinic actions of acetylcholine. It does not prevent the release of acetylcholine but antagonizes the effect of acetylcholine on the effector cells.