What are the recommended dosages of sumatriptan (oral, nasal spray, subcutaneous) for adults and adolescents, and what are its contraindications?

Sumatriptan Dosing Recommendations

For adults with acute migraine, use sumatriptan 6 mg subcutaneously for fastest and most effective relief, or 50-100 mg orally if subcutaneous administration is not feasible; intranasal 10-20 mg is an alternative when nausea/vomiting is prominent. 1, 2

Adult Dosing by Route of Administration

Subcutaneous (Most Effective)

• Initial dose: 6 mg - provides pain relief in 70-82% of patients within 15 minutes 1
• May repeat once after 1 hour if needed
• Maximum: 12 mg per 24 hours 1, 2
• This route achieves peak blood concentration fastest (approximately 15 minutes) and has the highest efficacy 1

Oral (Most Commonly Used)

• Initial dose: 25 mg, 50 mg, or 100 mg 2
• 50-100 mg doses are more effective than 25 mg, though 100 mg may not provide greater benefit than 50 mg 2
• May repeat after 2 hours if headache returns
• Maximum: 200 mg per 24 hours 1, 2
• Peak concentration occurs in 2-3 hours 1

Intranasal

• Dose: 5-10 mg (one to two sprays) in one nostril 1
• May repeat after 2 hours
• Maximum: 40 mg per day 1
• Faster onset than oral but slower than subcutaneous 3

Adolescents (12-17 years)

Intranasal sumatriptan 10-20 mg is the recommended formulation for adolescents, though efficacy data are mixed 4, 5, 6. Oral and subcutaneous formulations have not established efficacy in controlled trials in this age group 2. Consider ibuprofen first-line before advancing to triptans 4.

Key Contraindications

Absolute contraindications 1:

• Ischemic vascular conditions (coronary artery disease, previous MI)
• Vasospastic coronary disease (Prinzmetal's angina)
• Hemiplegic or basilar migraine
• Uncontrolled hypertension
• Use of ergotamine derivatives or MAOIs
• Use within 24 hours of another triptan
• Pregnancy 2
• Severe hepatic impairment 2

Special Populations

Hepatic Impairment

• Mild to moderate impairment: Maximum 50 mg single dose 2, 7
• Severe impairment: Contraindicated 2

Pregnancy & Lactation

• Pregnancy Category C - use only if benefit justifies risk 2
• Excreted in breast milk - avoid breastfeeding for 12 hours after treatment 2

Clinical Pearls

Route Selection Algorithm

1. Severe attacks or rapid progression: Use subcutaneous 6 mg 1
2. Moderate attacks without severe nausea: Use oral 50-100 mg 8, 2
3. Significant nausea/vomiting present: Use intranasal 10-20 mg or subcutaneous 6 mg with antiemetic 8, 4
4. Previous oral failure: Consider subcutaneous or intranasal formulation 1

Timing & Retreatment

• Treat early when pain is mild for better efficacy 8
• If one triptan fails, try another - individual response varies 1
• Headache recurrence occurs in ~40% within 24 hours and can be retreated with appropriate interval 1, 9
• Oral: Wait 2 hours between doses 2
• Subcutaneous: Wait 1 hour between doses 1

Critical Safety Warnings

• Do not exceed 4 headache treatment days per month to avoid medication-overuse headache 8, 10
• Never combine with ergotamine derivatives - must wait 24 hours between classes 1
• Chest symptoms occur in 3-5% but myocardial ischemia is rare 9
• Cardiovascular evaluation recommended before use in patients with cardiac risk factors (diabetes, hypertension, smoking, obesity, strong family history of CAD) 2

Adverse Events by Route

• Subcutaneous: Injection site reactions (~30%), chest pressure/heaviness, nausea 1, 9
• Oral: Nausea, vomiting, malaise, fatigue, dizziness 1
• Intranasal: Taste disturbance (19-25%), nasal discomfort 5, 6
• Most adverse events are transient and mild-to-moderate 9, 11