OpTIviral Eye Ointment is an antiviral medicine which treats eye infections caused by Herpes simplex virus. It works by preventing the multiplication of the virus on the surface of your eyeball (cornea). This stops the production of new viruses and clears up your eye infection. OpTIviral Eye Ointment should be taken in the dose and duration as advised by your doctor. Do not skip any doses and finish the full course of treatment even if you feel better. Dissolve it in a glass of water before taking it. It may be taken with or without food, but it is better to take it at a fixed time. If you miss a dose, take it as soon as possible. However, if it is almost time for your next dose, skip the missed dose and go back to your regular schedule. Do not double the dose. You should drink plenty of water while on treatment with this medicine as it helps to prevent dehydration and kidney damage.Some side effects of this medicine include nausea, vomiting, diarrhea and headache. Inform your doctor if these side effects persist for a longer duration. Please consult your doctor if you are pregnant, planning to conceive or breastfeeding.