It is the most frequent eye disease and the pharmacist plays an important role in solving the problems that patients present. Conjunctivitis Conjunctivitis is inflammation of the conjunctiva, which is the mucous membrane that covers the anterior part of the eye and the inside of the eyelids. It usually affects both eyes at the same time, although it can start in one eye and spread to the other in one or two days. Infectious conjunctivitis, caused by an infectious agent (bacteria, viruses or chlamydiae), usually manifests itself acutely. They can be asymmetrical, affecting one eye more than another. There are numerous causes of conjunctivitis, so the treatment depends on the established diagnosis. The different types of infectious conjunctivitis are bacterial, viral and chlamydial. Bacterial conjunctivitis It is characterized by abundant purulent secretion with intense conjunctival edema and conjunctival hyperemia. It starts in one eye, to subsequently pass to the other.