Whoever adulterates any drug or medical preparation in such a manner as to lessen the efficacy, or change the operation, of such drug or medical preparation, or to make it noxious, intending that it shall be sold or used for, or knowing it to be likely that it will be sold or used for any medicinal purpose, as if it had not undergone such adulteration, shall be punished with imprisonment for a term which may extend to 6 months, or with fine which may extend to $3,000, or with both.