The UK's Shire has entered a co-promotion agreement with drug major GlaxoSmithKline for Vyvanse (lisdexamfetamine dimesylate) in the treatment of attention-deficit hyperactivity disorder in adults. The firm's share price rose 8% on the day of the news, March 31, fueled by speculation that the move was a prelude to a takeover by the UK firm.
This three-year agreement covers the USA and will more than double the reach and frequency of the current sales effort for Vyvanse by adding over 600 sales representatives from GSK. The sales force is expected to begin promoting Vyvanse to physicians in May. The agreement is based on profit-sharing above an agreed-upon baseline figure.
Vyvanse was introduced in the USA in 2007 for the treatment of ADHD in children aged six to 12 years and approved in April 2008 in adults.
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