Cosopt is a solution used to reduce intraocular pressure in those with open-angle glaucoma and ocular hypertension who do not respond to beta-blockers.
Full prescribing information is available at:
http://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?id=8551
Check out Wikipedia for more user-friendly information:
http://en.wikipedia.org/wiki/Cosopt