Not Medical Advice: The Pill with an imprint K 57 has been identified as Oxycodone hydrochloride 20 mg.
It is used in the treatment of chronic pain and belongs to the drug class narcotic analgesics. It has a high potential for abuse, as it contains oxycodone, an opioid agonist and Schedule II controlled substance.
Oxycodone - the active ingredient in OxyContin - and hydrocodone are the most popular drugs among Americans who abuse prescription painkillers, a new study finds. Find out more at WebMD.