Shire Agrees To FDA Request To Conduct Clinical Trials Investigating The Potential Use Of Vyvanse® (Lisdexamfetamine Dimesylate) In Preschool-Age Children With ADHD

June 12, 2014

Shire plc (LSE: SHP, NASDAQ: SHPG) today announced that it has agreed to a Written Request by the Food and Drug Administration (FDA) to conduct pediatric clinical studies to investigate the potential use of Vyvanse^® (lisdexamfetamine dimesylate) for the treatment of Attention-Deficit/Hyperactivity Disorder (ADHD) in preschool-age children, ages 4 to 5.

“Shire is committed to continuing to add to the scientific body of knowledge about ADHD treatment options for patients,” said Philip Vickers, Ph.D., Head of Research and Development at Shire. “Additional efficacy and safety data will help clinicians and parents make informed treatment decisions for preschool-age children with ADHD.”

Currently there are few adequate and well-controlled studies of pharmacotherapy in preschool-age children with ADHD. Shire is in the process of developing design protocols for three clinical trials with Vyvanse that will make up the clinical trial program in preschool children: a pharmacokinetic study to help determine appropriate dosing and evaluate safety and tolerability; an efficacy and safety study; and an open-label study to evaluate long-term safety. A Data Monitoring Committee will also be established to monitor patient safety throughout the duration of the clinical program. Shire anticipates beginning the first trial in the preschool pediatric clinical trial program in the first half of 2015.

Upon FDA confirmation of a timely submission and review of data that adheres to the requirements of the Written Request, Shire will be entitled to the benefits of the Best Pharmaceuticals for Children Act, including a six-month extension to the exclusivity afforded by Shire’s patents for Vyvanse, which expire in 2023.

Vyvanse is a prescription medicine currently only approved for the treatment of ADHD in the United States, Canada, Australia, Mexico and several European countries (trade name: Elvanse^®/Tyvense^®) and Brazil (trade name: Venvanse^™). Vyvanse should only be used in accordance with locally approved prescribing information. In the U.S., Vyvanse is approved for the treatment of ADHD in patients age 6 and above.

CNS stimulants (amphetamines and methylphenidate-containing products) have a high potential for abuse and dependence. Assess the risk of abuse prior to prescribing and monitor for signs of abuse and dependence while on therapy.

ABOUT ADHD IN PRESCHOOL CHILDREN

ADHD is a neurobehavioral disorder that manifests as a persistent pattern of inattention and/or hyperactivity-impulsivity that interferes with functioning or development and is inconsistent with developmental level. The estimated prevalence of ADHD in the preschool population is three to five percent. Data suggest that only a small proportion of preschool-age children with ADHD respond adequately to behavioral therapy.

ABOUT Vyvanse^® (lisdexamfetamine dimesylate)

Information about Vyvanse

Vyvanse is a federally controlled substance (CII) because it can be abused or lead to dependence. Keep in a safe place to prevent misuse and abuse. Selling or sharing Vyvanse may harm others and is illegal.

Vyvanse is indicated for the treatment Attention-Deficit/Hyperactivity Disorder (ADHD) in patients 6 years and above. Vyvanse capsules are currently available in six once-daily dosage strengths of 20mg, 30mg, 40mg, 50mg, 60mg, and 70mg.

ADDITIONAL IMPORTANT SAFETY INFORMATION

Do not take Vyvanse if you or your child:
- is taking or has taken within the past 14 days an anti-depression medicine called a monoamine oxidase inhibitor or MAOI
- is sensitive to, allergic to, or had a reaction to other stimulant medicines
Some people have had the following problems when taking stimulant medicines, such as Vyvanse:
- Heart-related problems including:
  - sudden death in people who have heart problems or heart defects
  - sudden death, stroke and heart attack in adults
  - increased blood pressure and heart rate
    Tell your doctor if you or your child has any heart problems, heart defects, high blood pressure, or a family history of these problems. The doctor should check your or your child’s blood pressure and heart rate regularly during treatment.
    Call your doctor right away if you or your child has any signs of heart problems such as chest pain, shortness of breath, or fainting while taking Vyvanse.
- Mental (psychiatric) problems including:
  - new or worse behavior and thought problems
  - new or worse bipolar illness
  - In Children and Teenagers
    - new psychotic symptoms such as:
    - seeing things or hearing voices that are not real
    - believing things that are not true
    - being suspicious
    - new manic symptoms
      Tell your doctor about any drug abuse, alcohol abuse or mental problems that you or your child has had, or about a family history of suicide, bipolar illness, or depression.
      Call your doctor right away if you or your child has any new or worsening mental symptoms or problems while taking Vyvanse.
- Circulation problems in fingers and toes [Peripheral vasculopathy, including Raynaud’s phenomenon]:
  - Fingers or toes may feel numb, cool, painful, sensitive

Call your doctor right away if you have or your child has any of these signs or symptoms or develops unexplained wounds on fingers or toes while taking Vyvanse.

Tell the doctor if you or your child is pregnant, breast-feeding, or plans to become pregnant or breast-feed.
Vyvanse may cause serious side effects, including:
- slowing of growth (height and weight) in children. Your child should have his or her height and weight checked often while taking Vyvanse. The doctor may stop treatment if a problem is found during these check-ups.

The most common side effects reported in studies of Vyvanse were:

anxiety
decreased appetite
diarrhea
dizziness
dry mouth
irritability
loss of appetite
nausea
trouble sleeping
upper stomach pain
vomiting
weight loss

For additional safety information, click here for Prescribing Information and Medication Guide and discuss with your doctor.

For further information please contact:

Investor Relations
Jeff Poulton
[email protected]
+1 781 482 0945

Sarah Elton-Farr
[email protected]
+44 1256 894157

Media
Audrey Abernathy
[email protected]
+1 484-595-2389

Gwen Fisher
[email protected]
+1 484 595 9836

NOTES TO EDITORS

Shire enables people with life-altering conditions to lead better lives.

Our strategy is to focus on developing and marketing innovative specialty medicines to meet significant unmet patient needs.

We provide treatments in Neuroscience, Rare Diseases, Gastrointestinal, and Internal Medicine and we are developing treatments for symptomatic conditions treated by specialist physicians in other targeted therapeutic areas, such as Ophthalmology.

www.shire.com

Click here for the PDF version of this press release.

FORWARD - LOOKING STATEMENTS - "SAFE HARBOR" STATEMENT UNDER THE PRIVATE SECURITIES LITIGATION REFORM ACT OF 1995

Statements included in this announcement that are not historical facts are forward-looking statements. 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 adversely affected. The risks and uncertainties include, but are not limited to, that:

Shire’s products may not be a commercial success;
revenues from ADDERALL XR are subject to generic erosion and revenues from INTUNIV will become subject to generic competition starting in December 2014;
the failure to obtain and maintain reimbursement, or an adequate level of reimbursement, by third-party payors in a timely manner for Shire's products may impact future revenues, financial condition and results of operations;
Shire conducts its own manufacturing operations for certain of its Rare Diseases products and is reliant on third party contractors to manufacture other products and to provide goods and services. Some of Shire’s products or ingredients are only available from a single approved source for manufacture. Any disruption to the supply chain for any of Shire’s products may result in the Shire being unable to continue marketing or developing a product or may result in Shire being unable to do so on a commercially viable basis for some period of time.
the development, approval and manufacturing of Shire’s products is subject to extensive oversight by various regulatory agencies. Submission of an application for regulatory approval of any of our product candidates, such as our planned submission of a New Drug Application to the FDA for Lifitegrast may be delayed for any number of reasons and, once submitted, may be subjected to lengthy review and ultimately rejected. Moreover, regulatory approvals or interventions associated with changes to manufacturing sites, ingredients or manufacturing processes could lead to significant delays, increase in operating costs, lost product sales, an interruption of research activities or the delay of new product launches;
the actions of certain customers could affect Shire's ability to sell or market products profitably. Fluctuations in buying or distribution patterns by such customers can adversely impact Shire’s revenues, financial conditions or results of operations;
investigations or enforcement action by regulatory authorities or law enforcement agencies relating to Shire’s activities in the highly regulated markets in which it operates may result in the distraction of senior management, significant legal costs and the payment of substantial compensation or fines;
adverse outcomes in legal matters and other disputes, including Shire’s ability to enforce and defend patents and other intellectual property rights required for its business, could have a material adverse effect on Shire’s revenues, financial condition or results of operations;
Shire faces intense competition for highly qualified personnel from other companies, academic institutions, government entities and other organizations. Shire is undergoing a corporate reorganization and the consequent uncertainty could adversely impact Shire’s ability to attract and/or retain the highly skilled personnel needed for Shire to meet its strategic objectives;
failure to achieve Shire’s strategic objectives with respect to the acquisition of ViroPharma Incorporated may adversely affect Shire’s financial condition and results of operations;

and other risks and uncertainties detailed from time to time in Shire’s filings with the U.S. Securities and Exchange Commission, including its most recent Annual Report on Form 10-K.