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Naratriptan (Amerge, Naramig) is a triptan with a longer duration of action of 6 hours, compared to sumatriptan, rizatirptan, zolmitriptan, eletriptan, and almotriptan, which work for 2-4 hours. The seventh triptan, frovatriptan has the longest half-life of 26 hours, but its overall efficacy is not as good as than that of other triptans. These numbers of 6, 2-4 and 26 hours actually refer to drug’s half-life – the time it takes for the blood level of the drug to drop by half.
The duration of the effect is not important for most migraine sufferers because a quick-acting and highly effective drug stops the migraine process and there is no need for it to remain in the body. However, in some patients sumatriptan or another short-acting triptan may relieve symptoms for 4-6 hours and then migraine returns. Taking a second dose often works well, but not always. Those patients can benefit from taking naratriptan. Naratriptan also tends to have fewer side effects.
The longer half-life makes naratriptan better suited for “mini-prophylaxis” – taking a drug daily for several days to prevent a predictable menstrual migraine. However, sumatriptan has been also shown to work in this manner.
Just like with other triptans, naratriptan can be combined with ibuprofen or naproxen for better efficacy. Many insurers limit the number of pills they will pay for to 6 or 9, but naratriptan, along with sumatriptan and rizatriptan is one of the cheaper triptans. This allows patients to buy additional quantities, although many doctors have the mistaken belief that triptans cause medication overuse headaches and refuse to write prescriptions for more than 9 pills a month.
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