Which medication on the patient's medication list would the nurse know is being used to treat the patient's primary open-angle glaucoma (POAG)?

Latanoprost is a medication specifically indicated for the treatment of primary open-angle glaucoma (POAG). It belongs to a class of drugs known as prostaglandin analogs, which work by increasing the outflow of aqueous humor, the fluid that fills the front part of the eye. This helps to lower intraocular pressure, which is crucial in managing glaucoma and preventing damage to the optic nerve.

The other medications listed do not have indications for the treatment of POAG. Lisinopril, for instance, is an antihypertensive medication used primarily to treat high blood pressure and heart failure, while simvastatin is utilized for lowering cholesterol levels. Ceftriaxone is an antibiotic used to treat various bacterial infections. Therefore, these medications have no direct role in managing glaucoma, making latanoprost the appropriate choice for this condition.