Salagen, generically known as pilocarpine hydrochloride, is a medication primarily used to treat dry mouth (xerostomia) resulting from radiation therapy for cancer or Sjögren's syndrome, a long-term autoimmune disease that affects the body's moisture-producing glands. It belongs to a class of drugs known as cholinergic agonists, which work by stimulating the secretion of saliva and sweat. Salagen helps alleviate the discomfort associated with dry mouth by increasing the natural production of saliva, thereby improving the ability to speak, swallow, and taste. It is typically administered in tablet form and taken several times a day, as prescribed by a healthcare provider. Patients are advised to follow their doctor's instructions closely when taking Salagen, as the dosage may need to be adjusted based on individual response and any potential side effects.