Common complaints

Headache

Adults with migraine. No dose: the Canadian sources here print none.

Investigate

  • CWC Choosing Wisely Canada
DecisionGuideline
S, systemic
Fever and meningismus.

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N, neurologic
Unexplained focal neurological signs.Papilloedema.

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O, onset
Thunderclap onset.

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O, older
Onset after age 50.

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P, precipitants
Unusual attack triggers.

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Radiology red flags
Recent onset, rapidly worse.Wakes from sleep. Dizziness, incoordination, tingling or numbness, new neurologic deficit. New headache with cancer or immunodeficiency.

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Episodic migraine
No brain or sinus imaging if the exam is normal and there is no red flag.

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Uncomplicated headache
No imaging unless red flags.

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Treat

  • CWC Choosing Wisely Canada
  • CHS Canadian Headache Society
DecisionGuideline
Acute migraine
NSAIDs or a triptan first.No opioid or opioid/barbiturate combination first-line.

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Frequent attacks
Headache diary first.Overuse risk: opioids, triptans, ergots or combinations 10 or more days a month; NSAIDs or acetaminophen 15 or more.

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Lifestyle
Regular meals and sleep, trigger and stress management.Relaxation training, pacing, how to take acute drugs.

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Prevention, strong
Most CGRP-blocking drugs (episodic and chronic).Propranolol (episodic and chronic). OnabotulinumtoxinA (chronic). Candesartan, Metoprolol, Amitriptyline, Nadolol, Riboflavin, Coenzyme Q10, Magnesium citrate, Butterbur (episodic).

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Prevention, weak
Episodic:Topiramate, Memantine, Levetiracetam, Enalapril, Melatonin, Divalproex, Flunarizine, Pizotifen, Venlafaxine, Verapamil, Lisinopril. Topiramate (chronic). Against Gabapentin, Statins (alone or add-on). Rimegepant weak; not approved in Canada as prevention.

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Do not use
Episodic:OnabotulinumtoxinA, Feverfew, Ginger.

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Reviewed 18 October 2026 against the official sources below.

Sources