Hyoscyamine is a medical term used to define a medication that is used to treat various medical conditions. This medication is synthesized from the extracts of the plants belonging to the nightshade family. Some of the synonyms for hyoscyamine include the generic name of the medication - atropine, as well as belladonna alkaloids and anticholinergics. Atropine is commonly used in the treatment of heart rhythm disorders and dilation of the pupil during ophthalmic surgery. Belladonna alkaloids are used in the treatment of gastrointestinal disorders, while anticholinergics are used in the management of muscle spasms and tremors. Overall, these medications are used to alleviate symptoms associated with a variety of medical conditions, including nerve disorders, gastrointestinal disorders, and others.