most helpful answer i always recommend that people use the antibiotic eye drop in both eyes from the beginning since it can definitely spread to the other eye. an antibiotic eye drop would only be effective for pink eye caused by a bacterial pathogen. many cases of pink eye are viral or even allergic so in this case the antibiotic would not likely help. a viral conjunctivitis (pink eye) can spread even when you are on antibiotic eye drops.
after on antibiotics for 24 hours to treat pinkeye in one eye if then get pinkeye in other eye is one contagious again?