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Anonymous
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Lithium doses are usually not calculated by weight alone, and it may be quite tricky to calculate the apporporiate dosage for an individual. According to www.russellcottrell.com/md/lithium/shtm "A number of methods predicting lithium dosage have been published. One of the simplest is that of Zetin and colleagues: Lithium Carbonate, mg/day = 486.8 + (746.83 + level) - (10.08 X age) + (5.95 X weight) + (147.8 X sex) +(92.01 X inpatient) - (74.73 X TCA) where "level" is the target serum concentration in meg/L; "age" is in number of years; "weight" is in kg; sex: 1 for male, 0 female; "inpatient": 1 for yes, 0 no; and "TCA" is 1 for concurrent tricyclic antidepressant use, 0 for not." So the short answer to your question is that the dose is 5.95 X patient's weight in kg; but that's only a small part of the equation.
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