AANP Family Nurse Practitioner (FNP) Certification ExamEvaluationHard
A 50-year-old female with newly diagnosed fibromyalgia is started on duloxetine 30 mg daily. After 4 weeks, she reports a 20% improvement in pain but continues to have significant fatigue and widespread body aches. She tolerates the medication well. What is the most appropriate next step in her management?
- AIncrease duloxetine to 60 mg daily.
- BAdd pregabalin 75 mg BID.
- CSwitch to amitriptyline 10 mg at bedtime.
- DRefer to a pain specialist for interventional therapies.
Show answer & explanationAnswer & explanation
Correct answer: A. Increase duloxetine to 60 mg daily.
Duloxetine typically starts at 30 mg daily and can be titrated to 60 mg daily for fibromyalgia. Given her partial response and good tolerance, increasing the dose is the next logical step before adding or switching medications.
Why the other options are wrong
- B. Adding pregabalin is a valid augmentation strategy, but typically considered after optimizing the first-line monotherapy dose.
- C. Switching to amitriptyline (a tricyclic antidepressant) is usually considered if the patient fails to respond or tolerates duloxetine poorly at its maximal dose.
- D. Interventional pain therapies are not typically first-line for fibromyalgia, which is primarily managed with pharmacotherapy and non-pharmacologic approaches.
Fibromyalgia Pharmacotherapy Titration
For fibromyalgia, if a patient has a partial response to an initial dose of a first-line medication (e.g., duloxetine, pregabalin, milnacipran) and tolerates it well, the dose should be increased to the next therapeutic level.
- Duloxetine, pregabalin, and milnacipran are FDA-approved for fibromyalgia.
- Titrate medications slowly to minimize side effects.
- Aim for maximal tolerated and effective dose before switching or augmenting.
Memory trick: With fibromyalgia, start low, but if pain still shows, raise the dose, then consider more.