Lithium (an active substance) is a drug, Priadel (a brand version of lithium carbonate) is a medicine. Drug and medicine is specifically distinguished in medic

Lithium (an active substance) is a drug, Priadel (a brand version of lithium carbonate) is a medicine. Drug and medicine is specifically distinguished in medical science. But again, in many contexts this distinction doesn't matter and most people don't even know the difference. It doesn't mean that we have no idea what is a drug or what is a medicine.