Overview Special Drug Use Investigation for AMERGE® Tablet (Long-term) Status: Completed Trial end date: 2013-10-01 Target enrollment: Participant gender: Summary To investigate the long-term safety and efficacy of AMERGE (naratriptan hydrochloride) on Japanese patients with migraine headache in clinical setting Details Lead Sponsor: GlaxoSmithKlineTreatments: Naratriptan