If i used polytrim (polymyxin b and trimethoprim) in eye last month and got pink eye again this month i used polytrim (polymyxin b and trimethoprim) again would that be considered prolonged use?

No: However, recurrent eye infections should make you wonder why this is happening. If you are a contact lens user, perhaps there is a problem with your lens hygiene. Also, this time of year allergic conjunctivitis is common and can simulate or bring on infection. Finally, be sure to clean your eyelashes and lids daily with a washcloth and warm water.