a substance that is used as a medicine or narcotic, any substance intended for use in the treatment, prevention, diagnosis, or cure of disease, especially one listed in the official pharmacopoeia published by a national authority, A drudge, verb_ use recreational drugs, administer a drug to, intransitive verb_ obsolete To drudge; to toil laboriously, To prescribe or administer drugs or medicines, transitive verb_ To affect or season with drugs or ingredients; esp, to stupefy by a narcotic drug Also Fig, To dose to excess with, or as with, drugs