In an adult without known contraindications, can alprazolam (Xanax) cause headaches?

Can Xanax Cause Headaches?

Yes, alprazolam (Xanax) can cause headaches both during active use and especially during withdrawal or discontinuation. According to FDA labeling data, headache occurred in 17.0% of patients discontinuing Xanax compared to lower rates in placebo-treated patients 1.

Headaches During Active Use

The FDA-approved prescribing information for Xanax does not list headache as a common adverse reaction during active treatment in the standard adverse event tables for generalized anxiety disorder or panic disorder 1. The most common side effects during active use include:

• Drowsiness (41-77% depending on indication)
• Fatigue and tiredness (49%)
• Dizziness and light-headedness (19-21%)
• Cognitive impairment (29-33%)

Headaches During Discontinuation (Withdrawal)

The more clinically significant concern is discontinuation-emergent headaches. In a database of 641 patients treated with Xanax, headache was reported as a discontinuation-emergent symptom in 17.0% of patients—occurring at rates greater than placebo-treated patients 1. This places headache among the top withdrawal symptoms alongside:

• Insomnia (29.5%)
• Anxiety (19.2%)
• Light-headedness (19.3%)
• Fatigue (18.4%)

Clinical Context: Benzodiazepines and Migraine

An important caveat exists regarding the relationship between short-acting benzodiazepines like alprazolam and headaches. A 2017 population-based study found that exposure to short-acting benzodiazepines was associated with increased migraine occurrence (adjusted OR = 1.69,95% CI = 1.59-1.80) 2. This suggests a potential bidirectional relationship where:

1. Patients with anxiety disorders (who receive alprazolam) may have higher baseline rates of migraine
2. Short-acting benzodiazepines themselves may trigger or worsen migraines
3. Withdrawal between doses of short-acting agents may precipitate rebound headaches

Medication Overuse Headache Risk

While the migraine guidelines focus primarily on analgesics, NSAIDs, triptans, and opioids as causes of medication overuse headache 3, 4, the principle of rebound headaches from frequent medication use applies broadly. Benzodiazepines used regularly can lead to interdose withdrawal symptoms, including headaches, particularly with short-acting agents like alprazolam which has a relatively brief half-life.

Clinical Recommendations

If a patient on Xanax develops new or worsening headaches:

1. Assess timing relative to dosing: Headaches occurring before the next scheduled dose suggest interdose withdrawal
2. Evaluate for medication overuse pattern: Daily or near-daily benzodiazepine use increases risk
3. Consider discontinuation syndrome: If headaches emerged during dose reduction, this represents a withdrawal symptom requiring slower taper
4. Rule out other causes: New headaches warrant standard evaluation per clinical context

For patients requiring benzodiazepine therapy who develop headaches, consider switching to a longer-acting agent (e.g., clonazepam, diazepam) which may reduce interdose withdrawal phenomena, though the 2017 study found that long-acting benzodiazepines alone were not associated with increased migraine risk 2.

Avoid using benzodiazepines to treat primary headache disorders. While older literature suggested potential benefit in tension-type headache 5 or refractory migraine 6, current evidence does not support this practice, and the risks of dependence, withdrawal, and potential worsening of headaches outweigh any theoretical benefits 7, 8.