FDA Approves Additional Dosage Strengths of Shire's ADHD Treatment Vyvanse (lisdexamfetamine dimesylate) Which May Help Physicians Tailor Treatment for Individual Patients

PHILADELPHIA, January 03, 2008 /PRNewswire-FirstCall/ -- Shire plc , the global specialty biopharmaceutical company, today announced that it has received approval from the U.S. Food and Drug Administration (FDA) for three additional dosage strengths for the attention deficit hyperactivity disorder (ADHD) treatment, Vyvanse (lisdexamfetamine dimesylate). Shire expects the three additional dosage strengths of 20 mg, 40 mg and 60 mg will be available in retail pharmacies in the second quarter of 2008 to supplement the existing 30 mg, 50 mg and 70 mg dosage strengths currently available in pharmacies throughout the country.

"Shire is pleased that physicians will soon have the benefit of a wider range of Vyvanse dosage strengths which they can prescribe to help manage the ADHD symptoms of their patients," said Matt Emmens, Chief Executive Officer of Shire Pharmaceuticals. "In its first six months of availability, more than 500,000 Vyvanse prescriptions have been dispensed, indicating that physicians see Vyvanse as an effective treatment option for their patients."

Dose titration, the process of incrementally increasing or decreasing the dose of a medication, is a widely used method in clinical practice to help achieve optimal efficacy and tolerability for each patient. The option of having dosage strengths with smaller increments allows for a more gradual titration of medication and may help the physician tailor the treatment for each individual patient.

"Shire has also experienced early success with managed care coverage for Vyvanse, which is now preferred on three of the five largest national plans. According to available national data, more than 85 percent of lives in the United States are covered for Vyvanse in Tier 3 or better," added Emmens. "We are optimistic that the formulary coverage for Vyvanse will continue to improve as we move into 2008."

Vyvanse is currently approved in the United States for the treatment of ADHD in children aged 6 to 12 years. A Supplemental New Drug Application (sNDA) for Vyvanse for the treatment of ADHD in adults is currently under review by the FDA.

Vyvanse is a therapeutically inactive prodrug, in which d-amphetamine is covalently bonded to l-lysine, and after oral ingestion it is converted to pharmacologically active d-amphetamine. The conversion of Vyvanse to d- amphetamine is not affected by gastrointestinal pH and is unlikely to be affected by alterations in normal GI transit times.

Additional information about Vyvanse and Full Prescribing Information are available at www.vyvanse.com.

About ADHD

Approximately 7.8 percent of all school-age children, or about 4.4 million U.S. children aged 4 to 17 years, have been diagnosed with ADHD at some point in their lives, according to the U.S. Centers for Disease Control and Prevention (CDC). ADHD is one of the most common psychiatric disorders in children and adolescents. The disorder is also estimated to affect 8.1 percent of adults, or approximately 9.2 million adults across the U.S. based on a retrospective survey of adults aged 18 to 44, projected to the full U.S. adult population. ADHD is a neurobiological disorder that manifests as a persistent pattern of inattention and/or hyperactivity-impulsivity that is more frequent and severe than is typically observed in individuals at a comparable level of development. To be properly diagnosed with ADHD, a child needs to demonstrate at least six of nine symptoms of inattention; and/or at least six of nine symptoms of hyperactivity/impulsivity; the onset of which appears before age 7 years; that some impairment from the symptoms is present in two or more settings (e.g., at school and home); that the symptoms continue for at least six months; and that there is clinically significant impairment in social, academic or occupational functioning and the symptoms cannot be better explained by another psychiatric disorder.

Although there is no "cure" for ADHD, there are accepted treatments that specifically target its symptoms. The most common standard treatments include educational approaches, psychological or behavioral modification, and medication.

About Vyvanse

Tell the doctor about any heart conditions, including structural abnormalities, that you, your child, or a family member, may have. Inform the doctor immediately if your child develops symptoms that suggest heart problems, such as chest pain or fainting.

Vyvanse should not be taken if your child has advanced disease of the blood vessels (arteriosclerosis); symptomatic heart disease; moderate to severe high blood pressure; overactive thyroid gland (hyperthyroidism); known allergy or unusual reactions to drugs called sympathomimetic amines (for example, pseudoephedrine); seizures; glaucoma; a history of problems with alcohol or drugs; agitated states; taken a monoamine oxidase inhibitor (MAOI) within the last 14 days.

Tell the doctor before taking Vyvanse if your child is being treated for or has symptoms of depression (sadness, worthlessness, or hopelessness) or bipolar disorder; has abnormal thought or visions, hears abnormal sounds, or has been diagnosed with psychosis; has had seizures or abnormal EEGs; has or has had high blood pressure; exhibits aggressive behavior or hostility. Tell the doctor immediately if your child develops any of these conditions or symptoms while taking Vyvanse.

Abuse of amphetamines may lead to dependence. Misuse of amphetamine may cause sudden death and serious cardiovascular adverse events. These events have also been reported rarely with amphetamine use.

Vyvanse was generally well tolerated in clinical studies. The most common side effects reported in studies of Vyvanse were decreased appetite, difficulty falling asleep, stomachache, and irritability.

Aggression, new abnormal thoughts/behaviors, mania, growth suppression, worsening of motion or verbal tics, and Tourette's syndrome have been associated with use of drugs of this type. Tell the doctor if your child has blurred vision while taking Vyvanse.

Shire plc

Shire's strategic goal is to become the leading specialty biopharmaceutical company that focuses on meeting the needs of the specialist physician. Shire focuses its business on attention deficit and hyperactivity disorder (ADHD), human genetic therapies (HGT), gastrointestinal (GI) and renal diseases. The structure is sufficiently flexible to allow Shire to target new therapeutic areas to the extent opportunities arise through acquisitions. Shire's in-licensing, merger and acquisition efforts are focused on products in niche markets with strong intellectual property protection either in the US or Europe. Shire believes that a carefully selected portfolio of products with strategically aligned and relatively small-scale sales forces will deliver strong results.

For further information on Shire, please visit the Company's website: www.shire.com

"SAFE HARBOR" STATEMENT UNDER THE PRIVATE SECURITIES LITIGATION REFORM ACT OF 1995
Statements included herein that are not historical facts are forward- looking statements. Such forward-looking statements involve a number of risks and uncertainties and are subject to change at any time. In the event such risks or uncertainties materialize, Shire's results could be materially affected. The risks and uncertainties include, but are not limited to, risks associated with: the inherent uncertainty of pharmaceutical research; product development including, but not limited to, the successful development of JUVISTA(R) (Human TGFBeta3) and GA-GCB (velaglucerase alfa); manufacturing and commercialization including, but not limited to, the launch and establishment in the market of Vyvanse (lisdexamfetamine dimesylate) (Attention Deficit and Hyperactivity Disorder ("ADHD")); the impact of competitive products including, but not limited to, the impact of those on Shire's ADHD franchise; patents including, but not limited to, legal challenges relating to Shire's ADHD franchise; government regulation and approval including, but not limited to, the expected product approval date of INTUNIV (guanfacine extended release) (ADHD); Shire's ability to secure new products for commercialization and/or development; and other risks and uncertainties detailed from time to time in Shire plc's filings with the Securities and Exchange Commission, particularly Shire plc's Annual Report on Form 10-K for the year ended December 31, 2006.

CONTACT: Jacelyn Seng, +1-212-601-8385, or Brooke Salti, +1-212-601-8241,both of Porter Novelli for Shire plc

Ticker Symbol: (NASDAQ-NMS:SHPGY),(Toronto:SHQ.)

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Posted: January 2008

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