show it to a pharmacist. many will be able to identify it immediately if it is a common prescription pill. if it is a generic or a vitamin maybe not. there are drug identification sites on the internet but without a number or imprint to go on a blue-oblong pill could be anything.
found a blue oblong pill in my friends place. he has been dating a person that uses drugs. blue oblong pill with no imprint. not a vitamin. could be linked to drug abuse trying to find out what it could possibly be.