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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.
The recommended intravenous dosage in adults is 500 mg every 6 hours or 1000 mg every 12 hours, with modification to achieve a therapeutic range as needed. The recommended oral dosage in the treatment of antibiotic-induced pseudomembranous enterocolitis is 125 to 500 mg every 6 hours for 7 to 10 days.
For women with a high-risk penicillin allergy and whose GBS isolate is not susceptible to clindamycin intravenous vancomycin (20 mg/kg intravenously every 8 hours, with a maximum of 2 gm per single dose) is the only valid option.
An example for a simple case (mono-compartmental) would be to administer D=8 mg/kg to a human. A human has a blood volume of around V b l o o d = {\displaystyle V_{blood}=} 0.08 L/kg . [ 7 ] This gives a C 0 = {\displaystyle C_{0}=} 100 μg/mL if the drug stays in the blood stream only, and thus its volume of distribution is the same as V b l o ...
For instance, if the ADI is based on data from humans the safety factor is usually 10 instead of 100. The ADI is usually given in mg per kg body weight. [5] The ADI is considered a safe intake level for a healthy adult of normal weight who consumes an average daily amount of the substance in question.
For comparison, those with a V d L/kg body weight of less than 0.2 are mainly distributed in blood plasma, 0.2-0.7 mostly in the extracellular fluid and those with more than 0.7 are distributed throughout total body water.
In adults and children over the age of 12, linezolid is usually given every 12 hours, whether orally or intravenously. [54] [62] In younger children and infants, it is given every eight hours. [63] No dosage adjustments are required in the elderly, in people with mild-to-moderate liver failure, or in those with impaired kidney function. [64]
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.