Oxycodone is a drug that is taken to relieve moderate-to-severe pain. If you are looking for oxycodone, you will find that it is available in 5, 10, 15, 20, 30, 40, 60, and 80 mg pills. If you buy oxycodone online, you will need a prescription that will help you take the drug in the right manner and also help you combat the side effects and withdrawal symptoms of the drug when they occur in the first place.