For a patient taking Relpax (eletriptan), what is the maximum recommended usage to avoid medication‑overuse headache?

Maximum Relpax Usage to Prevent Medication Overuse Headache

To prevent medication overuse headache (MOH) while taking Relpax (eletriptan), limit use to fewer than 10 days per month. 1

The Critical Threshold

The most recent 2025 American College of Physicians guideline explicitly states that triptans (including eletriptan/Relpax) have a threshold of ≥10 days per month for medication overuse headache 1. This means:

• Safe zone: Use Relpax on 9 or fewer days per month
• Risk zone: Using Relpax on 10 or more days per month for ≥3 months puts the patient at risk for developing MOH

This threshold is lower than NSAIDs (which have a threshold of ≥15 days per month), making triptans more prone to causing medication overuse headache 1.

FDA-Approved Dosing Parameters

According to the FDA label, the safety of treating more than 3 headaches in a 30-day period has not been established 2. This provides an even more conservative upper limit than the MOH threshold. The FDA guidance suggests:

• Maximum single dose: 40 mg
• Maximum daily dose: 80 mg (if second dose needed, wait at least 2 hours)
• Established safety data exists only for treating ≤3 headaches per month 2

Clinical Algorithm for Safe Use

If your patient is using Relpax:

1. Count treatment days, not doses - Using Relpax twice in one day counts as ONE day of use
2. Track monthly patterns - Keep a headache diary documenting each day Relpax is taken
3. Red flag at 8-9 days/month - If approaching 10 days, this signals need for preventive therapy
4. Mandatory intervention at ≥10 days/month - Patient requires preventive medication, not more acute treatment

When Frequent Use Signals Need for Prevention

If episodic migraine occurs frequently or treatment doesn't provide adequate response, preventive medications are warranted 1. The 2025 ACP guideline emphasizes this as a critical decision point - don't just keep prescribing more acute medication.

Common Pitfall to Avoid

The most dangerous mistake: Allowing patients to use Relpax "as needed" without tracking days per month. This passive approach leads directly to MOH. The patient may think they're using it appropriately because they're treating legitimate migraines, but crossing the 10-day threshold transforms their episodic migraine into chronic daily headache through medication overuse 1.

What Defines MOH

MOH occurs when headache is present on ≥15 days per month for at least 3 months in someone with a preexisting headache disorder, developing because of acute medication overuse 1. For triptans specifically, this develops when used on ≥10 days per month 1.

Action Steps When Threshold Is Exceeded

If your patient is already using Relpax ≥10 days per month:

1. Educate about the relationship between frequent triptan use and MOH
2. Initiate preventive therapy (topiramate, propranolol, candesartan, or anti-CGRP monoclonal antibodies are evidence-based options) 3, 4
3. Withdraw the overused medication - this is essential for MOH management 5, 6, 4
4. Set firm limits on future acute medication use to <10 days/month

Bottom line: 9 days per month maximum for Relpax to stay safe from medication overuse headache, with FDA safety data supporting even more conservative use of ≤3 treatment days per month.