Decongestants

Decongestants are generally effective at reducing symptoms of pink eye, such as itchiness, burning, and tearing. However, they will not cure an infection and cannot stop the spread of pink eye. Decongestants work by shrinking blood vessels in the conjunctiva, thus reducing redness and swelling. Decongestants are available as eyedrops or ointments. They are safe for use in children and adults.
However, people with glaucoma or other conditions that cause increased pressure in the eye should not use decongestant eyedrops because they can further increase pressure. People with heart conditions should also avoid decongestant eyedrops because they may raise blood pressure.
While anyone can develop pink eye from decongestants, those with pre-existing conditions such as allergies or dry eye are at an increased risk. In some cases, individuals with existing pink eye and using a decongestant may also worsen the symptoms.
If you experience these symptoms after using a decongestant product, discontinue use immediately and consult a doctor. To avoid developing pink eye from decongestants in the first place, it is recommended to follow the instructions on the product label carefully. Do not use the product for longer than directed, and do not apply it more often than directed.