Laudanum by pharmacists in preparing Paregoric from Laudanum, and to note that the dosages in this article refer to Apothecaries weight and fluid measure. In particular, "the difference between a minim and a drop should be borne in mind when figuring doses. A minim is always a sixtieth part of a fluidrachm regardless of the character of the substance, while a drop varies from a forty-fifth to a two-hundred-and-fiftieth part, according to the surface tension of the fluid." Tincture of Opium (Laudanum) and Camphorated Tincture of Opium (Paregoric) each have 50.9 drops per gram; 50.0 drops per cc; 185.0 drops per
Drug their knowledge) arose later and invokes the psychoactive rather than medicinal properties of a substance. A "medication" or "medicine" is a drug taken to cure or ameliorate any symptoms of an illness or medical condition. The use may also be as preventive medicine that has future benefits but does not treat any existing or pre-existing diseases or symptoms. Dispensing of medication is often regulated by governments into three categories—"over-the-counter" medications, which are available in pharmacies and supermarkets without special restrictions; "behind-the-counter" medicines, which are dispensed by a pharmacist without needing a doctor's prescription, and "prescription only medicines", which must be