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Bethanechol [Urecholine]
Bethanechol [Urecholine] is given orally for treating glaucoma. Direct-acting cholinergic drugs such as carbachol [Carboptic] are also used to treat increased intraocular pressure in conditions such as glaucoma and have positive effects when administered topically in the form of eye drops but are poorly absorbed when administered orally. Pilocarpine [Salagen, Pilocar] also has poor absorption capacity when administered orally for the treatment of intraocular pressure. However, it can be used orally for treating dry mouth (xerostomia). Drugs such as donepezil [Aricept] and galantamine [Razadyne] are indirect-acting drugs and are mostly used to treat neurological disorders such as Alzheimer's disease.