Description Alphagan (brimonidine tartrate) is a prescription eye drop commonly used to treat glaucoma or ocular hypertension by reducing elevated intraocular pressure (IOP). It works by decreasing the production of aqueous humor (fluid in the eye) and increasing its drainage. Key Information: Dosage: Typically, one drop in the affected eye(s) twice or three times daily, as directed by your doctor. Common Side Effects: Eye redness or irritation Dry mouth Blurred vision Fatigue or drowsiness Precautions: Avoid using if allergic to brimonidine or any of its components. Inform your doctor if you have conditions like severe heart disease, depression, or Raynaud’s disease. Avoid driving or operating heavy machinery if it causes drowsiness or blurred vision. Always follow your doctor’s instructions and consult them if you experience unusual or severe side effects.