Buy Codeine Online is used to help relieve mild to moderate pain. Codeine belongs to a class of drugs known as opioid analgesics. It works in the brain to change how your body feels and responds to pain. Read the Medication Guide provided by your pharmacist before you start taking codeine and each time you get a refill. If you have any questions, ask your doctor or pharmacist. If you are using the liquid form of this medication, carefully measure the dose using a special measuring device/spoon. Do not use a household spoon because you may not get the correct dose.