Shares of Vanda Pharmaceuticals gained $2.53, or about 20%, on 31 January after the FDA approved the company’s drug Hetlioz (tasimelteon) as circadian regulator to treat non-24-Hour (non-24), a rare sleep-wake disorder, in patients with total blindness.
Vanda's stock closed at $13.23 on 31 January, up 17 cents, or 1.3%.





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