Key takeaways
Gentak (gentamicin) and Flagyl (metronidazole) are both antibiotics, but they treat different types of infections and are used in different ways. Gentak (gentamicin) is an aminoglycoside antibiotic used as eye drops or ointment to treat bacterial infections of the eye or eyelid, such as pink eye or blepharitis. It works by blocking bacteria from making proteins they need to survive. On the other hand, Flagyl (metronidazole) is a nitroimidazole antibiotic taken by mouth to treat various bacterial and parasitic infections, including trichomoniasis and bacterial vaginosis. It kills bacteria and parasites by damaging their genetic material. While Gentak is applied directly to the eye and starts working right away, Flagyl is taken orally and can cause side effects like nausea and a metallic taste. Additionally, you must avoid alcohol while taking Flagyl and for three days after, as it can cause a serious reaction. Both medications are available in lower-cost generic forms and require a prescription.
