Used primarily in the treatment of dry mouth (xerostomia), especially in patients with Sjögren's syndrome. It stimulates salivary flow by activating muscarinic receptors in the salivary glands. Also prescribed for dry eyes and dry mouth associated with autoimmune disorders. Due to its ability to cross the blood-brain barrier, it may have effects on central nervous system functions, though clinical use focuses on exocrine gland stimulation. Typically administered orally in tablet form, it provides symptomatic relief and improves quality of life by restoring moisture in oral and ocular tissues.