Look up and away from the dropper. Squeeze out a drop and close your eye. If you are using more than one drop in the same eye or drops in both eyes, repeat the process with about 5 minutes between drops. Tetrahydrozoline ophthalmic can be used up to four times a day. Do not use tetrahydrozoline ophthalmic more often or over a longer period than is recommended.
Overuse can cause increased redness and irritation in the eye and can even lead to permanent damage.
Do not touch the dropper to any surface, including your eyes or hands. The dropper is sterile. If it becomes contaminated, it could cause an infection in your eye. Do not use any eye drop that is discolored or has particles in it. Store tetrahydrozoline ophthalmic at room temperature away from moisture and heat.