Used primarily in ophthalmology to treat glaucoma, this compound helps reduce intraocular pressure by enhancing the outflow of aqueous humor. It acts as a long-acting cholinesterase inhibitor, increasing cholinergic activity at neuroeffector sites in the eye. This results in prolonged miosis and improved drainage of fluid from the eye, making it useful in chronic management of open-angle glaucoma. Its sustained effect allows for less frequent dosing compared to shorter-acting agents.