Dosage Calculations

Mrs. Zegin has a gram-negative bacterial infection. The physician prescribes Amikin (amikacin sulfate) 250 mg IM. The pharmacy dispenses Amikin 500 mg/2mL. How many mL's do you administer?

1 mL

Mrs. Slater has a migraine headache. The physician prescribes promethazine 12.5 mg IM. The pharmacy dispenses a prefilled syringe of promethazine 25mg/mL. How much promethazine do you administer?

0.5 mL

The physician prescribes meperidine (Demerol) 50mg IM now for acute pain. Meperidine 100mg/mL for IM injection is available in a prefilled syringe. How much Demerol do you give the patient?

0.5 mL

Mr. Hill has the following prescription: Ativan 4 mg PO daily; divide he total dose so that the equal amounts are given every 6 hrs. You mark the times on the medication sheet according to hospital policy to be 0600, 1200, 1800, and 2400 hours. What is the dose of Lorazepam to be given at each of those times?

1 mg

6 year old Ursela has a fever, and the nurse practitioner has prescribed Tylenol 160 mg orally q6h x 24 hr. The pharmacy dispenses acetaminophen 80 mg per 1/2 tsp. How much Tylenol do you tell Urselas mother to give her child every 6 hrs?

1 tsp

Mrs Gutierrez is 88 years old and has a fever of 101.4 F (taken orally). She is prescribed acetaminophen 320 mg orally. The pharmacy dispenses the medication as 160 mg/5mL. How much acetaminophen do you administer?

10 mL

Your pt., Mrs Wollenstein, needs her blood pressure maintained below 110/70 mm Hg due to increased intercranial pressure. She is alert and oriented and able to take oral medications. Her physician prescribes 50 mg metoprolol tartrate if her systolic BP is between 111 and 125 mm Hg, 75 mg if her systolic BP is between 125 and 150 mm Hg, and 100 mg if her systolic BP is more than 151 mm Hg. Mrs Wellensteins BP is currently 226/128 mm Hg. How much Lopressor do you administer?

100 mg

Jared Brown has been dx with male hypogonadism. He comes to the clinic every 4 weeks to receive an IM injection of 400 mg of testosterone enanthate. On this visit, the pharmacy dispenses testosterone enanthate 200 mg/mL. How much medication do you draw up to give Jared?

2 mL

Mr. Horner has been dx with syphilis, and the physician has prescribed penicillin G benzathine 600,000 units IM. The pharmacy dispenses the penicillin G in 300,000 units/mL. How many mL's do you give Mr. Horner?

2 mL

Ms. Chambers has isoniazid-induced vitamin B6 deficiency and is prescribed pyridoxine hydrochloride 200 mg IM. The pharmacy dispenses vitamin B6 as 100 mg/mL. How many mL's do you give Ms. Chambers?

2 mL

Mr. Heinz has been bitten by a spider and has an infection. The physician prescribes Rocephin 250mg IM. The pharmacy dispenses ceftriaxone sodium 1g/10mL. How much of the medicine do you administer?

2.5 mL

Mr. Lolitto requires a daily dose of phenobarbital to prevent seizures by maintaining a consistent blood level of the medication. He is prescribed phenobarbital elixir 80 mg orally at bedtime. The pharmacy sends up an elixir consisting of 20 mg of phenobarbital per 5 mL. What volume do you administer to Mr. Lolitto at bedtime?

20 mL

Jane Doe is admitted with severe psychotic disorder and prescribed prochlorperazine edisylate 20 mg IM STAT. The pharmacy dispenses Compazine as 5 mg/mL. How many mL's should you prepare to give Jane Doe?

4 mL

You should inject air into ampules before withdrawing the desired amount of medication. T/F

False, you inject air into a vial not an ampule