**Example : **

Calculate the dose of Amoxicillin suspension in mLs for a patient weighing 20 pounds. The dose required is 50 mg/kg/day divided three times daily and the suspension comes in a concentration of 250 mg / 5 ml

**Step 1 : If the patient weight is in pounds convert it to kilograms**

22 pounds × 0.45359237 = 9.979 kilograms

**Step 2 : Calculate the daily dose in milligram**s

50 × 9.979 = 498.951 mg per day

**Step 3 : Check if the calculated daily dose exceeds the maximum daily dose**

498.951 mg per day does not exceed the maximum daily dose

**Step 4 : Divide the daily dose by the frequency**

498.951 ÷ 3 = 166.317 mg per dose repeated three times daily

**Step 5 : Convert the milligrams dose to milliliters volume**

166.317 × 5 ÷ 250 = 3.3263 ml per dose repeated three times daily

**Step 6 : Rounding the volume**

The final answer is

Amoxicillin 250 mg / 5 ml Suspension

Give 3.3 ml three times daily