Side effects that have been reported in more than 1 in 10 persons treated with generic Brimonidine include dry eyes, red eyes, irritation of the eyes, headache, blurred vision, a feeling of a foreign body in the eye, and drowsiness. Less ordinary side effects include corneal staining, increased sensitivity to light, eyelid redness, eye pain, tearing, and eyelid swelling. Consult a local doctor if you experience any of these side effects after you buy Brimonidine.