Can i substitute cipro (ciprofloxacin) for keflex to treat an eye infection related to a stye?

Speak to your doctor: Keflex is an older antibiotic but is extremely effective (and liekly moreso than cipro) against the bacteria that tend to be involved in eyelid infections. It is advisable to stick with the medication that your doctor prescribes, rather than trying to save money by using a medication that you have left over from a previous infection.