Codeine 30 mg is a prescription opioid that helps manage moderate pain and a persistent cough. It works by targeting opioid receptors in the brain and central nervous system, which helps to lessen the feeling of pain and calm the cough reflex. Often, it's paired with other medications like paracetamol or aspirin. It's really important to take Codeine 30 mg exactly as your doctor prescribes, since it can come with side effects like drowsiness, constipation, and the potential for dependence.