General Info:

Brimonidine (Alphagan) reduces the amount of fluid in the eye, which decreases pressure inside the eye.

Brimonidine is used to treat open-angle glaucoma or ocular hypertension (high pressure inside the eye). Brimonidine (Alphagan) is also used to induce miosis for people suffering from poor night vision after Lasik or PRK surgery. Brimonidine may also be used for other purposes not listed in this medication guide.

Brimonidine acts via decreasing synthesis of aqueous humor, and increasing the amount that drains from the eye. Brimonidine stimulates alpha receptors found on the blood vessels that supply the ciliary body. This causes the blood vessels to constrict, and reduces the amount of watery fluid that filters out of the blood vessels to form aqueous humour.

Brimonidine (Alphagan) eye drops are used to treat glaucoma in people who cannot use beta-blocker eye drops.