Scopolamine, also known as hyoscine, is a tropane alkaloid drug obtained from plants of the family Solanaceae (nightshades), such as henbane or jimson weed (Datura species). It is part of the secondary metabolites of plants.

It is structurally similar to the neurotransmitter acetylcholine and acts by blocking the muscarinic acetylcholine receptors; it is thus classified as an anticholinergic.

In medicine, it is usually used in the form scopolamine hydrobromide. It can be used as a depressant of the central nervous system, though it can cause delirium in the presence of pain, mydriasis (pupillary dilation), and cycloplegia (paralysis of the eye muscles). When combined with morphine, it produces a tranquilized state known as twilight sleep and amnesia. Although originally used in obstetrics, it is now considered dangerous for that purpose. Sometimes it can be mistaken for symptoms of cancer because of the nausea and anisocoria associated with brain tumors. However, scopolamine induced anisocoria clears up usually within 3 days.

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