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The BNF for Children developed from the British National Formulary (BNF), which prior to 2005 had provided information on the treatment of children, with the doses largely determined by calculations based on the body weight of the child. The guidance was provided by pharmacists and doctors whose expertise was in the care of adults.
The procedure is to take the child's weight in pounds, divide by 150 lb, and multiply the fractional result by the adult dose to find the equivalent child dosage.For example, if an adult dose of medication calls for 30 mg and the child weighs 30 lb, divide the weight by 150 (30/150) to obtain 1/5 and multiply 1/5 times 30 mg to get 6 mg.
Paracetamol's bioavailability is dose-dependent: it increases from 63 % for 500 mg dose to 89 % for 1000 mg dose. [6] Its plasma terminal elimination half-life is 1.9–2.5 hours, [ 6 ] and volume of distribution is roughly 50 L. [ 132 ] Protein binding is negligible, except under the conditions of overdose, when it may reach 15–21 %. [ 6 ]
The concentration in serum after a typical dose of paracetamol usually peaks below 30 mg/L, which equals 200 μmol/L. [45] Levels of 30–300 mg/L (200–2000 μmol/L) are often observed in overdose patients. Postmortem blood levels have ranged from 50 to 400 mg/L in persons dying due to acute overdosage.
The active ingredient of its original flagship product is paracetamol (known in the United States, Canada, and various other countries as acetaminophen), an analgesic and antipyretic. Like the words paracetamol and acetaminophen, the brand name Tylenol is derived from a chemical name for the compound, N-acetyl-para-aminophenol (APAP). [1]
Ibuprofen/paracetamol, sold under the brand name Combogesic among others, is a fixed-dose combination of two medications, ibuprofen, a non-steroidal anti-inflammatory drug (NSAID); and paracetamol (acetaminophen), an analgesic and antipyretic. [6] It is available as a generic medication. [9] [10] [11]
Simply switching the patient from 40 mg of morphine to 10 mg of levorphanol would be dangerous due to dose accumulation, and hence frequency of administration should also be taken into account. There are other concerns about equianalgesic charts. Many charts derive their data from studies conducted on opioid-naive patients.
The term dosage form may also sometimes refer only to the pharmaceutical formulation of a drug product's constituent substances, without considering its final configuration as a consumable product (e.g., capsule, patch, etc.). Due to the somewhat ambiguous nature and overlap of these terms within the pharmaceutical industry, caution is ...