A nurse is preparing to administer amitriptyline 300 mg PO dally divided equally every 12 hr to a client who has post-traumatic stress disorder. Available is amitriptyline 75 mg tablets. How many tablets should the nurse administer in each dose? (Round the answer to the nearest whole number. Use a leading zero if it applies. Do not use a trailing, zero.)
The Correct Answer is ["2"]
Calculate the dose per administration:
The total daily dose is 300 mg, divided equally every 12 hours.
There are 24 hours in a day, so there are 24 hours / 12 hours = 2 doses per day.
Each dose is 300 mg / 2 doses = 150 mg.
Calculate the number of tablets per dose:
Each tablet contains 75 mg of amitriptyline.
The required dose is 150 mg.
150 mg / 75 mg per tablet = 2 tablets per dose
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
A) Clonazepam 0.5 mg PO three times daily: This prescription is appropriate. Clonazepam, a benzodiazepine, is often used for short-term management of anxiety or agitation, which can be associated with manic episodes. The prescribed dose of 0.5 mg three times daily is within the typical therapeutic range and is commonly used in the acute management of mania.
B) Lithium 300 mg PO three times daily: This prescription is appropriate. Lithium is a first-line medication used to treat mania in bipolar disorder. The prescribed dose of 300 mg three times daily falls within the typical dosing range for managing mania. Lithium requires regular blood level monitoring due to its narrow therapeutic window, but the prescription itself is reasonable.
C) Risperidone 3.0 mg PO daily: This prescription is appropriate. Risperidone, an atypical antipsychotic, is commonly prescribed for the management of mania or psychosis in bipolar disorder. The prescribed dose of 3.0 mg daily is within the usual therapeutic range and is often effective for controlling symptoms of mania.
D) Divalproex 1.5 g PO twice daily: This prescription should be clarified. The prescribed dose of 1.5 g twice daily is unusually high for divalproex, which is commonly used for mood stabilization in bipolar disorder. A more typical starting dose for divalproex would be 750 mg to 1 g daily, and it is usually titrated based on the client’s response and serum drug levels. A dose of 3 g daily could increase the risk of side effects, including hepatotoxicity and thrombocytopenia, and should be clarified with the provider.
Correct Answer is ["1.6"]
Explanation
Identify the desired dose:
The doctor has ordered 40 mg of chlorpromazine hydrochloride.
Identify the concentration of the available medication:
The available chlorpromazine hydrochloride injection is 25 mg/mL.
Set up the calculation:
We need to find out how many mL are needed to administer 40 mg of the medication. We can use the following formula:
(Desired dose) / (Concentration) = Volume to administer
Plug in the values and calculate:
(40 mg) / (25 mg/mL) = 1.6 mL
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