Acetazolamide, sold under the trade name Diamox®, is a carbonic anhydrase inhibitor that is used to treat glaucoma, epileptic seizures, benign intracranial hypertension and altitude sickness. For glaucoma sufferers, the drug decreases fluid formation around the eye resulting in lower internal pressure on the eye. Acetazolamide can only be obtained by prescription and is available as a generic drug.