High eye pressures may damage the optic nerve, resulting in damage to vision, a condition called glaucoma. Once diagnosed, doctors often begin by prescribing eye drops to lower eye pressure. One such drop, Alphagan P, the brand name for brimonidine eye drops, is typically used three times a day. Like any medication, Alphagan P can have side effects that may lead to serious complications if not addressed.
Irritation
Alphagan P belongs to a group of eye drops that has a high likelihood of an allergic response, states the Glaucoma Research Foundation. Surface irritation of the eye is one of the most common allergic reactions. Many people who use Alphagan P will experience burning and stinging when they put in the eye drops. For some, the irritation continues long after they use the drops. Redness and tearing may also result from using the eye drop. If you experience irritation from the eye drops, discuss the reaction with your eye doctor. In some cases, the doctor will recommend continued use, so long as symptoms do not worsen.
Vision
Using Alphagan P may also result in changes in vision. After putting a drop in your eye, blurred vision---which gradually improves---may result from the surface irritation caused by the eye drop. Alphagan P may also result in light sensitivity. However, more serious changes in vision may occur, such as flashes of light, floaters or blind spots, warns MedlinePlus. If you experience vision changes, stop using the eye drops and contact your eye doctor immediately.
Systemic Effects
Eye drops can cause systemic effects when some of the drops drain through the tear ducts, into the throat and down to the stomach. Alphagan P may cause minor symptoms, such as headaches, tiredness and dry mouth, explains MedlinePlus. If you experience problems breathing, dizziness or fainting, stop using the drops and contact the eye doctor.
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