How many mg should be administered to a patient weighing 44lbs taking amikacin sulfate?

Amikacin: The usual dose is 5 mg per kg. 44 pound is about 20 kg. So the answer is 100 mg. But amikacin dose must be proportioned to kidney function. So 100 mg would be optimal IF the kidney function is normal

Amikacin dose: Unfortunately there is more that I don't know about this patient than I do know. Amikacin is dosed based on a patient's kidney function and that is not provided. Assuming labs are normal, dosing would be 7.5mg/kg every 12 hours. I am questioning if the weight is correct. A 19 y/o female weighing only 41 lbs? If true this patient would receive 150 mg every 12 hours.

Depends on reason: Pediatric dosing is usually 15-30 mg/kg/day, divided in 1-3 doses a day, so total daily dose 300-600mg for someone weighing 44 lbs. Low or high dose depends on the severity of infection. Adult dose for uncomplicated UTI is only 250 mg twice a day, and max adult daily dose is 1.5 grams a day.