Brimonidine

Brimonidine (bri-MOE-ni-deen) is a drug used as eye drops under the brand names Alphagan and Alphagan-P to treat open-angle glaucoma or ocular hypertension, and as a gel, Mirvaso, for facial skin redness in rosacea.

It acts via decreasing synthesis of aqueous humor, and increasing the amount that drains from the eye through uveoscleral outflow; brimonidine treats reddened skin (erythema) by causing narrowing of blood vessels (vasoconstriction).