Well, generally speaking, erythromycin is a frequently prescribed antibiotic that's available in many forms, including tablets, capsules and suspensions for oral use. According to some experts, the most common side effects involve irritation to the surface of the eye and it can lead to conjunctivitis. Also, it can affect the eyelids, leading to blepharitis. And then redness, itching, tearing and light sensitivity can occur. By the way, you should know that contamination of the ointment in the tube can occur from contact with unwashed hands or from contact with any part of the eye. This can result in a secondary bacterial infection and requires medical attention. So just pay more attention to it.