Buy Oxycodone Online is another strong pain medicine used for serious pain (like after surgery or with cancer). It comes in quick-acting or slow-release forms. It is also found in Percocet (with acetaminophen). It works like hydrocodone blocks pain and helps you feel calm, but it’s even stronger. It is very addictive and can cause an overdose easily, especially if taken with alcohol or sleeping pills. It can also make it hard to breathe.