 [ Symptoms ] how long should we usesulfacetamide sodium ophthalmic [ Disease ] i assume you are treating pink eye conjunctivitis the course of therapy can be anywhere from 5 10 days depending on the severity and response to this antibiotic a good average would be a week but it is best to use it for a day or two longer than it takes your problem to completely resolve this stuff tends to burn so my heart goes out to you