Final answer:
Latanoprost, a prostaglandin analog, is often the first line of treatment for open angle glaucoma to reduce intraocular pressure, not pilocarpine.
Step-by-step explanation:
The first line of treatment for a patient with open angle glaucoma and raised intraocular pressure (IOP) is often a prostaglandin analog, such as latanoprost. Prostaglandin analogs work by increasing the outflow of aqueous humor from the eye, thereby reducing IOP. Although pilocarpine can also be used for glaucoma treatment, as it contracts the ciliary muscle and facilitates aqueous humor drainage, it is not typically the first-line treatment due to its short duration of action and side effects. Timolol, a beta-blocker, and apraclonidine, an alpha agonist, are alternatives but are also not usually first-line options.