Pill with imprint 30 M is Blue, Round and has been identified as Oxycodone Hydrochloride 30 mg. Here you can buy Oxycodone Over the counter . Oxycodone is used in the treatment of chronic pain; pain and belongs to the drug class narcotic analgesics. FDA has not classified the drug for risk during pregnancy. Oxycodone 30 mg is classified as a Schedule 2 controlled substance under the Controlled Substance Act Oxycodone has both analgesic and central nervous system depressant effects, making it effective for the treatment of moderate to severe pain. It works by binding to specific opioid receptors in the brain and spinal cord, which helps to block pain signals and provide relief.