What non‑NSAID over‑the‑counter medication is recommended for treating a headache?

Non-NSAID Over-the-Counter Headache Medicine

Acetaminophen (paracetamol) 1000 mg is the recommended non-NSAID over-the-counter medication for treating headache, particularly for patients who cannot tolerate NSAIDs or have contraindications to them. 1

Efficacy of Acetaminophen for Headache

Migraine-Specific Evidence

• Acetaminophen 1000 mg is statistically superior to placebo for acute migraine treatment, with a number-needed-to-treat (NNT) of 12 for 2-hour pain-free response (19% response vs. 10% with placebo). 2
• For 2-hour headache relief, acetaminophen achieves an NNT of 5.0 (56% response vs. 36% with placebo). 2
• For 1-hour headache relief, the NNT is 5.2 (39% response vs. 20% with placebo). 2

Comparative Effectiveness

• While acetaminophen is effective, its efficacy is inferior to NSAIDs and combination therapies for moderate-to-severe headache. 2
• Acetaminophen alone has limited evidence for migraine relief compared to NSAIDs or combination analgesics. 3

Optimal Dosing Strategy

• Use 1000 mg (1 gram) per dose as the therapeutic dose for headache treatment. 3, 2
• Maximum daily dose should not exceed 4 grams per day. 3
• Verify adequate dosing before escalating to other therapies—many patients use subtherapeutic doses. 3, 4

Enhanced Efficacy with Combination Therapy

Acetaminophen + Aspirin + Caffeine

• The combination of acetaminophen 250 mg + aspirin 250 mg + caffeine 65 mg is effective for acute migraine (Level A evidence). 5
• This fixed-dose combination is considered first-line therapy for mild migraine. 4
• The addition of caffeine enhances analgesic efficacy. 6

Acetaminophen + Antiemetic

• Adding metoclopramide 10 mg to acetaminophen 1000 mg provides efficacy equivalent to oral sumatriptan 100 mg for 2-hour headache relief. 2
• This combination is particularly useful when nausea accompanies the headache. 2

Safety Profile

• Adverse event rates with acetaminophen are similar to placebo. 2
• No serious adverse events occurred with acetaminophen alone in clinical trials. 2
• Acetaminophen is generally considered the safest option during pregnancy and lactation among acute headache treatments. 4

Clinical Algorithm for Non-NSAID Headache Treatment

Step 1: Initial Assessment

• Confirm headache severity (mild vs. moderate-to-severe). 4
• Identify contraindications to NSAIDs (gastrointestinal disease, renal impairment, cardiovascular disease, anticoagulation). 1
• Assess for nausea or vomiting. 1

Step 2: Medication Selection

For mild headache without nausea:

• Start with acetaminophen 1000 mg alone. 4, 2
• Alternative: acetaminophen 250 mg + aspirin 250 mg + caffeine 65 mg combination. 4, 5

For mild-to-moderate headache with nausea:

• Use acetaminophen 1000 mg + metoclopramide 10 mg. 2

For moderate-to-severe headache (when NSAIDs contraindicated):

• Combine acetaminophen 1000 mg with a triptan (e.g., sumatriptan, rizatriptan). 1, 3
• Rizatriptan 10 mg + acetaminophen 1000 mg produces 300 additional patients per 1000 achieving pain freedom at 2 hours compared to acetaminophen alone. 4

Step 3: Timing of Administration

• Administer medication as early as possible after headache onset to maximize efficacy. 1, 4
• Early treatment markedly improves outcomes compared to delayed dosing. 4

Important Limitations and Caveats

When Acetaminophen Is Insufficient

• If acetaminophen at adequate doses (1000 mg) fails to provide relief after 2–3 trials, escalate to prescription therapy rather than increasing frequency. 3
• Patients experiencing disability with ≥50% of attacks are poor candidates for over-the-counter-exclusive therapy and should seek prescription migraine-specific medications. 7

Medication Overuse Risk

• Limit acetaminophen use to fewer than 15 days per month to avoid medication-overuse headache. 1
• Medication overuse headache is defined as headache occurring ≥15 days per month for at least 3 months due to overuse of acute medication. 1

Contraindicated Medications

• Do not use opioids (hydromorphone, morphine, oxycodone) or butalbital-containing compounds for headache treatment—they increase medication-overuse headache risk and provide inferior outcomes. 1, 5, 8
• Hydromorphone IV must not be offered for migraine treatment (Level A evidence). 8

Cost Considerations

• Acetaminophen is among the least expensive headache treatments, with wide availability and no prescription requirement. 9, 2
• Generic acetaminophen costs approximately $500 annually for regular use, compared to $5,994 for newer prescription agents. 4
• Prescribe the least costly effective option that meets clinical needs. 1

Common Pitfalls to Avoid

• Underdosing: Ensure patients use 1000 mg per dose, not 500 mg or 650 mg. 3, 4
• Delayed treatment: Waiting until pain is severe reduces efficacy. 4
• Overreliance on acetaminophen alone: For moderate-to-severe headache, combination therapy is superior. 1, 3
• Excessive frequency: Using acetaminophen ≥15 days per month leads to medication-overuse headache. 1
• Ignoring preventive therapy: If headaches require acute treatment ≥4 days per week, initiate preventive medication rather than increasing acute treatment frequency. 1, 3