Key takeaways
Gentak (gentamicin) and Tobrex (tobramycin) are both aminoglycoside antibiotics used to treat bacterial infections of the eye or eyelid. Both medications are available as an eye drop and an eye ointment. Both medications require a prescription and are not available over-the-counter. Gentak and Tobrex work by blocking bacteria from making proteins necessary for their protective covering. However, Gentak is noted for its affordability and availability in a lower-cost generic in both forms, while Tobrex only has a generic solution. Tobrex is suitable for people as young as 2 months old. Common side effects for both include temporary eye irritation, but Tobrex may also cause eyelid itching and swelling. Both medications should be used for the full prescribed duration to prevent the infection from returning or becoming harder to treat.
