Codeine 30 mg is a prescription medication; used to work as narcotic analgesics. It is an FDA-approved medication that works well for injuries, muscles, food pain, etc. Codeine 30 mg is an opioid medication that is used in the clock treatment of mild to moderately severe pain. This medication is legal, if you are suffering from various types of pain. This is an FDA-approved medication; which you can take twice per day. In case skip the first dose, do not take a double dose in the second dose; because it produces side effects.