Codeine is an opioid derived medication which is approved by Food and Drug Association (FDA) for the treatment of cough, diarrhoea and contains the chemical properties which can suppress form mild to moderately severe pain as well. The molecules of the medicinal drug interact with the central nervous system and block those receptors which generate a signal of pain to the body. The scientific studies suggest that when an optimum dose of this drug is taken in combination with paracetamol tablets then it can match the efficacy of morphine. You can buy codeine pills from any physical pharmacy but due to the protocols set by the medical establishments, the pharmacist would ask numerous questions before handing over the drug to avoid its misuse. If you want to avoid that bothersome scenario, you can buy codeine pills from any online drug store which appears to be legit.