Ensure that you are not touching the dropper together with your hands directly or the dropper isn’t touching any part of your eye. Doing so will contaminate the infections and dropper could be caused to your eyes. You can easily buy Alphagan online. It is offered by all online drug shops and also you can purchase generic Alphagan or buy brimonidine over the counter as this medication is a non prescription drugs. You can select to buy Alphagan online as they sell the medicine for a cheaper price than when compared to local drug shops but be careful when you are selecting a cheaper drug store ad they may sell duplicate medicine also.