Shire plc and its collaborative partner New River Pharmaceuticals Inc announced that the US Food and Drug Administration (FDA) has granted marketing approval for Vyvanse (lisdexamfetamine dimesylate, formerly known as NRP104), for the treatment of Attention Deficit Hyperactivity Disorder (ADHD).
Shire and New River has announced an agreement whereby Shire will acquire New River for approximately $2.6 billion in an all cash transaction unanimously recommended by the Boards of both companies.
Vyvanse is a prodrug that is therapeutically inactive until metabolised in the body. In clinical studies designed to measure duration of effect, Vyvanse provided significant efficacy compared to placebo for a full treatment day, up through and including 6:00 pm. Furthermore, when Vyvanse was administered orally and intravenously in two clinical human drug abuse studies, Vyvanse produced subjective responses on a scale of "Drug Liking Effects" (DLE) that were less than d-amphetamine at equivalent doses. DLE is used in clinical abuse studies to measure relative preference among known substance abusers.
"The FDA approval of Vyvanse is exciting news for Shire as well as for patients, their families, and healthcare providers as it's an important, novel approach for the treatment of ADHD," said Matthew Emmens, Shire CEO "The label we received with the approval letter includes information about the extended duration of effect and abuse-related drug liking characteristics of Vyvanse which illustrate benefits that differentiate this compound from other ADHD medicines. The addition of Vyvanse to our ADHD portfolio reaffirms Shire's commitment to continue to address unmet medical needs and advance the science of ADHD treatment. Beginning with product launch in Q2 2007, Shire will make Vyvanse our top promotional priority within our ADHD portfolio."
Randal J Kirk, New River's chairman and CEO, remarked, "Vyvanse's approval signals a new era in the treatment of ADHD. Upon product launch, patients will have a novel treatment option combining the effectiveness of a stimulant - long considered the gold standard in ADHD medicines - with other potential benefits."
The FDA has proposed that Vyvanse be classified as a Schedule II controlled substance. This proposal was submitted to and accepted by the US Drug Enforcement Administration (DEA).
Joseph Biederman, MD, director of Paediatric Psychopharmacology at Massachusetts General Hospital, was lead investigator on the pivotal clinical studies testing lisdexamfetamine dimesylate for the treatment of ADHD. These large multi-site studies showed that the drug significantly reduced ADHD symptoms throughout the day with a predictable tolerability profile. "Our studies showed that this next-generation stimulant medication's unique chemical profile offers an option for physicians and their patients in the treatment of ADHD, with outstanding efficacy and duration of action" said Dr Biederman.