Question

PHARMACOLOGY

• solve the following problems using the formula Basic formula, ratio and proportion and Dimensional analysis.
• Write your answer on the space provided

1. Order: Ranitidine 150 mg PO q12h

                Available     :     Ranitidine 75 mg per tablet

                Administer how many tablets per dose?_______________________

2. Order: Furosemide 20 mg IM stat

                Available     :     Furosemide 10 mg per ml

                Administer how many ml per dose?___________________________

3. Order: Phenytoin oral solution 0.25 g PO bid

                Available     :   Phenytoin oral solution 125 mg per 5 ml

                Administer how many ml per dose?_________________________________

Order:                   Valproic acid oral solution PO 15 mg per kg per day in two divided doses for a

pediatric patient who weighs 66 lb.

Available:            Valproic acid oral solution 250 mg per 5 ml

1. How many kilograms does the child weigh?______________________________
2. How many milligrams per day should the child receive?____________________
3. How many milligrams per dose should the child receive?___________________
4. How many millilliters per dose should the child receive?____________________

Order:                   Gentamycin 2.5 mg per kg q8h IV for a pediatric patient who weighs 38 lb.

Available:            Gentamycin 10 mg per ml

1. How many kilograms does the child weigh?______________________________
2. How many milligrams per dose will the child receive?___________________
3. How many millilliters per dose will the child receive?____________________

Answer 1

Question no 1

Ordered dose(D) = 150 mg

Dose in hand ( H) = 75 mg

Quantity it is in ( Q) = 1 tablet

Amount to be administered (A) = ?

A= D×Q/ H

A= 150×1/75= 2

So 2 tablets has to be Given

Question no 2

Ordered dose(D) = 20 mg

Dose in hand ( H) = 10 mg

Quantity it is in ( Q) = 1 ml

Amount to be administered (A) = ?

A= D×Q/ H

A= 20×1/10

A= 2 ml is to be given to the patient

Question no 3

Ordered dose(D) = .25 grams( 0.25 gram =250 milligrams) that is × 1000

Dose in hand ( H) = 125 mg

Quantity it is in ( Q) = 5 ml

Amount to be administered (A) = ?

A= D×Q/ H

A= 250×5/125= 10

10 ml is to be administered