A Patient Who Has Migraine Headaches Has Begun Taking Timolol

A patient who has migraine headaches has begun taking timolol and 2 months after beginning this therapy reports no change in frequency of migraines.The patient's current dose is 30 mg once daily.The primary care NP should:

A) change the medication to propranolol.
B) increase the dose to 40 mg once daily.
C) obtain serum drug levels to see if the dose is therapeutic.
D) tell the patient to continue taking the timolol and return in 1 month.

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