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Your cat patient weighs 11#. You wish to give Catbiotic, which is dosed at 3 mg/kg PO BID. Catbiotic comes as 5 mg, 15 mg and 50 mg tablets. Your dispensing directions read thus.
What is 1 15 mg tablet by mouth twice daily.
11#/2.2#/kg = 5 kg 5 kg x 3 mg/kg = 15 mg