MENU
You receive an order for 40mg/kg/dose of Amoxicillin every 12 hours. Pt's weight is 18 lbs. You have 250mg/5ml of amoxicillin suspension.
Calculate the total amount in milliliters needed for 10-day supply. Round up your answer to the nearest 1.
If 40mg of amoxicillin are needed per kg of body weight, then the dose of amoxicillin is 40mg multiplied by the
patient's body weight. This patient weighs 18 lbs, based on the conversion of 2.2 lbs = 1 kg, the patient weighs
8.2 kg. 40 mg multiplied by 8.2 kg is equal to 328 mg, this is one dose of amoxicillin. If the amoxicillin comes in 250 mg/5 mL, then it needs to be determined how many mLs it will take to get 328 mg of amoxicillin. In order to do this 328 mg needs to be divided by 250 mg to get a ratio. This comes out to be 1.312. This ratio can be multiplied by the number of mLs it takes to make up 250 mg, which is 5 mLs. 1.312 multiplied by 5 mLs is 6.56 mL, this is how many mLs it will take to have 328 mg. This volume is for 1 single dose of amoxicillin. The patient is receiving 2 doses per day and for a total of 10 days, this means the patient will be receiving 20
doses. 20 doses multiplied by 6.56 mL doses equals the total volume the patient will be receiving, which is
131.2 mL.