How to calculate the number of tablets to dispense to a patient weighing 147 lb?

Question

Fluconazole tabs 100 mg

Disp. tabs

Sig: tab ii stat, then 3 mg/kg b.i.d. × 7 days thereafter

Answer 1

To start, 2 tabs.

Then, 3 mg/kg twice a day for 7 days. How many tabs is this?

147 lbs x 1 kg/2.2 lbs = 66.8 kg

66.8 kg x 3 mg/kg = 200 mg twice a day. Since each tab is 100 mg, this is 2 tabs twice a day = 4 tabs per day

4 tabs/day x 7 days = 28 tabs

Number of tabs to dispense = 2 tabs + 28 tabs = 30 tabs.