There is no rule against repeating a prescription as often as may be desired by the patient, but a conscientious dispenser will see that he does not acquire a pernicious habit. The majority of prescriptions may be repeated without warning or comment; but there are some, such as those containing arsenic, digitalis, strychnine, etc, which, from their cumulative tendency, may produce serious consequences if repeated too frequently ; and in such cases it is, we believe, not more to the interest of the patient than of the dispenser that the suggestion be made to consult again the physician as to their continuance. There are other prescriptions, such as those containing chloral hydrate, morphine, and cocaine, the repetition of which is apt to engender the worst of vices on the part of the patient. A little reflection will show the responsibility incurred where repetition may lead to the formation of a bad habit. In regard to the repetition of medicines containing poisons, see the comments on page 5.