A single 75 mg dose of Nurtec ODT (rimegepant) provides migraine relief that can last up to 48 hours. In clinical trials, about 42% of patients experienced sustained pain relief from 2 to 48 hours after taking one tablet, compared to 25% on placebo. The drug’s actual effects and how long it stays in your system depend on several factors, including what other medications you take and how well your liver functions.
How Quickly It Starts Working
Nurtec is an orally dissolving tablet that you place on your tongue, where it breaks down without water. In the largest clinical trial, 59.3% of patients reported pain relief at the 2-hour mark, compared to 43.3% on placebo. That 2-hour window is the standard benchmark used across migraine drug studies, and it’s the earliest point where Nurtec consistently separates from placebo in trial data.
How Long Relief Lasts
Relief from a single dose extends well beyond those first couple of hours. Nearly 48% of patients in trials maintained sustained pain relief from 2 to 24 hours, and 42% kept that relief all the way out to 48 hours. For complete pain freedom (not just improvement, but no pain at all), 13.5% of patients achieved it by 2 hours and maintained it through 48 hours, versus 5.4% on placebo.
These numbers tell you something important: if Nurtec works for you in the first two hours, there’s a good chance you won’t need a second intervention for that migraine attack. But “lasting” doesn’t mean the same thing as “guaranteed.” About 36.6% of patients who initially responded to Nurtec saw their headache return within 48 hours. That recurrence rate is comparable to what you’d see with triptans, where recurrence ranges from roughly 28% to 34% within 24 hours for common doses.
Acute vs. Preventive Use
Nurtec is FDA-approved for two distinct purposes, and the dosing schedule changes how the drug behaves in your body. For acute treatment (stopping a migraine that’s already started), you take a single 75 mg tablet as needed, with no more than one per day. For episodic migraine prevention, the dose is 75 mg every other day. When taken on that every-other-day schedule, the drug builds up to a steady level in your system, providing a more continuous baseline of protection rather than the single-dose peak-and-decline pattern of acute use.
What Affects How Long It Stays in Your System
Your liver plays a major role in clearing Nurtec from your body. The drug is processed primarily through a liver enzyme pathway called CYP3A4, and anything that speeds up or slows down that pathway changes how long the drug lingers.
If you take medications that inhibit this enzyme pathway (certain antifungals, some antibiotics, and several HIV medications are common examples), Nurtec’s exposure in your bloodstream can increase dramatically. Strong inhibitors of this pathway can raise overall drug exposure by about 4-fold, meaning the drug effectively stays active much longer than intended. Moderate inhibitors roughly double the exposure. On the flip side, medications that rev up this enzyme pathway (like certain seizure medications or the antibiotic rifampin) can slash Nurtec’s exposure by up to 80%, potentially making it ineffective.
Liver health matters too. People with mild or moderate liver impairment can take Nurtec without dose adjustments. But severe liver impairment roughly doubles the drug’s peak concentration and overall exposure, which is why Nurtec is not recommended for people in that category.
Side Effects and Their Duration
The most common side effect is nausea, which is typically mild and tends to fade as your body adjusts to the medication. If nausea persists beyond a couple of weeks, that’s worth bringing up with your prescriber. Notably, sleepiness is not a reported side effect in clinical studies, which distinguishes Nurtec from some older migraine treatments that can leave you foggy or drowsy for hours.
Allergic reactions are possible and can show up in two patterns: soon after taking the tablet, or delayed by a few days. A delayed reaction can be confusing because you might not connect it to the medication right away. Symptoms like rash, swelling, or difficulty breathing after taking Nurtec warrant immediate medical attention regardless of timing.
How It Compares to Triptans for Duration
Triptans have been the standard acute migraine treatment for decades, so comparing duration is natural. The picture is nuanced. Frovatriptan, the longest-acting triptan, has recurrence rates of 10% to 25% within 24 hours, which is lower than Nurtec’s 36.6% recurrence rate over 48 hours. But these numbers are measured over different time windows and in different study populations, making direct comparisons imperfect.
Where Nurtec has a practical advantage is in its side effect profile and the absence of cardiovascular restrictions. Triptans constrict blood vessels, which limits their use in people with heart disease, uncontrolled blood pressure, or certain other vascular conditions. Nurtec works through an entirely different mechanism (blocking a protein involved in migraine signaling) and doesn’t carry those same restrictions. For someone who can’t take triptans, the duration question becomes secondary to the fact that Nurtec is an option at all.
Practical Tips for Getting the Most From a Dose
Nurtec dissolves on the tongue, so you don’t need water or food to take it. The tablet is designed to work regardless of whether you’ve eaten. Taking it early in a migraine attack, rather than waiting for pain to escalate, generally gives you the best chance of sustained relief through that 48-hour window. You’re limited to one tablet per day for acute use, so there’s no option to re-dose if the first tablet doesn’t fully work. If you find that a single dose consistently wears off before your migraine resolves, that’s useful information for your prescriber when discussing whether every-other-day preventive dosing might be a better fit.