Codeine is a pain relief medicine used to treat moderate to severe pain. It also helps in treating cough. You can use Codeine in combination with acetaminophen, aspirin etc. you can buy codeine at any pharmacy or can order online without any delivery charges. It comes in various doses i.e 15mg, 30mg and 60 mg. It also has several side effects like Constipation, Nausea, Drowsiness and Sweating.