# Oral Medication Dosage Calculations | Pharmacology NCLEX & Nursing School Exams Like A Boss

Oral Medication Dosage Calculations – Slides

Pharmacology Dosage Calculation and Conversions

### ORAL MEDICATION DOSAGE CALCULATIONS NCLEX QUIZ QUESTIONS

Question 1: You are caring for a patient at home who must take magnesium hydroxide/aluminum hydroxide (Maalox) 30 mL PO. How will you instruct the patient to measure the does using ordinary household measuring devices?

Question 2: A patient has a bottle of warfarin (Coumadin) 5mg tablets at home. After his most recent international normalized ratio (INR), the doctor calls and tells him to take 7.5 mg/day. How many tablets (scored) should the patient take?

Question 3: The physician orders alprazolam (Xanax) 0.5 mg PO. You have on hand Xanax 0.25 mg tablets. How many tablets will you give?

Question 4: You need to administer 250 mg of erythromycin (Erythrocin) PO. You have on hand 0.5 gram tablets. How many tablets will you give?

Question 5: You have available lorazepam (Ativan) 0.5 mg tablets, and you need to administer 1 mg PO. How many tablet(s) will you administer?

Question 6: A patient with heart failure has a daily order for digoxin (Lanoxin) 0.25 mg PO. Digoxin 0.125 mg tablets are available. How many tablet(s) should you give?

Question 7: You have an order to administer 40 mg of methadone (Dolophine) SC for opioid detoxification. You have on hand 30 mg/mL. How much should you draw into the syringe?

### ORAL MEDICATION DOSAGE CALCULATIONS NCLEX QUIZ ANSWERS

Question 1: You are caring for a patient at home who must take magnesium hydroxide/aluminum hydroxide (Maalox) 30 mL PO. How will you instruct the patient to measure the does using ordinary household measuring devices?

One tablespoon is equal to 15 mL. Convert 30 mL to tablespoon by multiplying it by one tablespoon. Then divide 30 by 15 mL to get the final answer of 2 tbsp.

Computation: 30 mL x 1 tbsp/15 mL = 2 tbsp

Question 2: A patient has a bottle of warfarin (Coumadin) 5mg tablets at home. After his most recent international normalized ratio (INR), the doctor calls and tells him to take 7.5 mg/day. How many tablets (scored) should the patient take?

Using desired over have times quantity. Divide desired dose (7.5 mg) by medication on hand (5mg) multiplied by 1 tablet.

Computation: 7.5 mg/5mg x 1 tablet = 1.5 tablets

Question 3: The physician orders alprazolam (Xanax) 0.5 mg PO. You have on hand Xanax 0.25 mg tablets. How many tablets will you give?

Using desired over have times quantity. Divide desired dose (0.5 mg) by medication on hand (0.25mg) multiplied by 1 tablet.

Computation: 0.5 mg/0.25mg x 1 tablet = 2 tablets

Question 4: You need to administer 250 mg of erythromycin (Erythrocin) PO. You have on hand 0.5 gram tablets. How many tablets will you give?

1 gram is equal to 100mg Convert 250 mg to grams first by multiplying 250 mg to 1 gram, then divide the answer by 100 mg to 0.25 grams. Using desired over have times quantity. Divide desired dose (0.25 grams) by medication on hand (0.5 grams) multiplied by 1 tablet.

Computation: 0.25 grams/0.5 grams x 1 tablet = 0.5 tablets

Question 5: You have available lorazepam (Ativan) 0.5 mg tablets, and you need to administer 1 mg PO. How many tablet(s) will you administer?

Using desired over have times quantity. Divide desired dose (1 mg) by medication on hand (0.5 mg) multiplied by 1 tablet.

Computation: 1 mg/0.5mg x 1 tablet = 2 tablets

Question 6: A patient with heart failure has a daily order for digoxin (Lanoxin) 0.25 mg PO. Digoxin 0.125 mg tablets are available. How many tablet(s) should you give?

Using desired over have times quantity. Divide desired dose (0.25 mg) by medication on hand (0.125 mg) multiplied by 1 tablet.

Computation: 0.25 mg/0.125 mg x 1 tablet = 2 tablets

Question 7: You have an order to administer 40 mg of methadone (Dolophine) SC for opioid detoxification. You have on hand 30 mg/mL. How much should you draw into the syringe?