| http://www.w3.org/ns/prov#value | - Between 17 and 29 percent of patients discontinue medication because of adverse effects such as anxiety, nausea, vomiting, sleep time reduction, drowsiness, or weakness.26, 27 Drug choices are based on efficacy and adverse effects, doctors??? beliefs about off-label medications, patient preferences, headache frequency, presence of aura, and comorbid conditions.10, 21, 22, 28-32 Some guidelines rec
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