News Release
                    
                Mallinckrodt Pharmaceuticals Presents 11 Posters with Data on Investigational Opioid, MNK-155, and XARTEMIS™ XR (oxycodone hydrochloride and acetaminophen) Extended Release Tablets (CII) at PAINWeek 2014
                    LAS VEGAS--(BUSINESS WIRE)--Sep. 5, 2014--
      Mallinckrodt
      (NYSE: MNK) presented 11 posters with data on its investigational
      opioid, MNK-155, an extended-release oral formulation of hydrocodone and
      acetaminophen, and recently FDA-approved XARTEMIS XR (oxycodone
      hydrochloride and acetaminophen) Extended-Release Tablets (CII), at
      PAINWeek, September 2-6 in Las Vegas, Nevada. The studies examined the
      compound’s efficacy, safety, abuse-related characteristics and
      release/delivery profiles with immediate- and extended-release
      components.
    
      MNK-155 is an investigational extended-release oral formulation of
      hydrocodone and acetaminophen being studied for the management of
      moderate to moderately severe acute pain where the use of an opioid
      analgesic is appropriate. XARTEMIS XR is the first and only immediate-
      and extended-release oral combination of two clinically proven pain
      medications - oxycodone and acetaminophen, and is indicated for the
      management of acute pain severe enough to require opioid treatment and
      in patients for whom alternative treatment options (e.g., non-opioid
      analgesics) are ineffective, not tolerated or would otherwise be
      inadequate.
    
      For more information about Mallinckrodt’s presence at PAINWeek, contact
      Mallinckrodt Medical Information at 1.800.788.7898 or by email.
    
      “The data presented at PAINWeek demonstrate our continued commitment to
      research in the acute pain arena based on the breadth and depth of
      Mallinckrodt’s research,” said Mario Saltarelli, MD, PhD. “We plan to
      continue innovating and making great strides in this category to better
      serve our patients and encourage responsible use of our medications by
      the people who need them.”
    
      If you would like more information about PAINWeek, please click here.
    
      XARTEMIS™ XR (OXYCODONE HCL AND
      ACETAMINOPHEN) EXTENDED-RELEASE TABLETS, FOR ORAL USE, CII
    
      INDICATIONS AND USAGE
    
      XARTEMIS™ XR (oxycodone HCl and acetaminophen)
      Extended-Release Tablets (CII) is indicated for the management of acute
      pain severe enough to require opioid treatment and for which alternative
      treatment options are inadequate. Because of the risks of addiction,
      abuse, misuse, overdose, and death with opioids, even at recommended
      doses, reserve XARTEMIS XR for use in patients for whom alternative
      treatment options (e.g., non-opioid analgesics) are ineffective, not
      tolerated or would be otherwise inadequate.
    
      IMPORTANT RISK INFORMATION
    
      WARNING: ADDICTION, ABUSE, AND MISUSE; LIFE-THREATENING RESPIRATORY
      DEPRESSION; ACCIDENTAL EXPOSURE; NEONATAL OPIOID WITHDRAWAL SYNDROME;
      and HEPATOTOXICITY
    
      Addiction, Abuse, and Misuse
    
      XARTEMIS XR exposes patients and other users to the risks of opioid
      addiction, abuse, and misuse, which can lead to overdose and death.
      Assess each patient’s risk prior to prescribing XARTEMIS XR, and monitor
      all patients regularly for the development of these behaviors or
      conditions.
    
      Life-threatening Respiratory Depression
    
      Serious, life-threatening, or fatal respiratory depression may occur
      with use of XARTEMIS XR. Monitor for respiratory depression, especially
      during initiation of XARTEMIS XR or following a dose increase. Instruct
      patients to swallow XARTEMIS XR tablets whole; crushing, chewing, or
      dissolving XARTEMIS XR can cause rapid release and absorption of a
      potentially fatal dose of oxycodone.
    
      Accidental Exposure
    
      Accidental ingestion of XARTEMIS XR, especially in children, can
      result in a fatal overdose of oxycodone.
    
      Neonatal Opioid Withdrawal Syndrome
    
      Prolonged use of XARTEMIS XR during pregnancy can result in neonatal
      opioid withdrawal syndrome, which may be life-threatening if not
      recognized and requires management according to protocols developed by
      neonatology experts. If opioid use is required for a prolonged period in
      a pregnant woman, advise the patient of the risk of neonatal opioid
      withdrawal syndrome and ensure that appropriate treatment will be
      available.
    
      Hepatotoxicity
    
      XARTEMIS XR contains acetaminophen. Acetaminophen has been associated
      with cases of acute liver failure, at times resulting in liver
      transplant and death. Most of the cases of liver injury are associated
      with the use of acetaminophen at doses that exceed the maximum daily
      limit, and often involve more than one acetaminophen-containing product.
    
      CONTRAINDICATIONS
    
      - 
        XARTEMIS XR is contraindicated in patients with:
        
          - 
            known hypersensitivity to oxycodone, acetaminophen, or any other
            component of this product.
          
- 
            significant respiratory depression.
          
- 
            acute or severe bronchial asthma or hypercarbia.
          
- 
            known or suspected paralytic ileus.
          
 
      WARNINGS AND PRECAUTIONS
    
      - 
        XARTEMIS XR contains oxycodone, a Schedule II controlled substance. As
        an opioid, XARTEMIS XR exposes users to the risks of addiction, abuse,
        and misuse. Abuse or misuse of XARTEMIS XR by crushing, chewing,
        snorting, or injecting the dissolved product will result in the
        uncontrolled delivery of the oxycodone and can result in overdose and
        death. With intravenous abuse, the inactive ingredients in XARTEMIS XR
        can result in death, local tissue necrosis, infection, pulmonary
        granulomas, and increased risk of endocarditis and valvular heart
        injury. Parenteral drug abuse is commonly associated with transmission
        of infectious diseases such as hepatitis and HIV.
      
      - 
        Serious, life-threatening, or fatal respiratory depression has been
        reported with the use of opioids, even when used as recommended. While
        serious, life-threatening, or fatal respiratory depression can occur
        at any time during the use of XARTEMIS XR, the risk is greatest during
        the initiation of therapy or following a dose increase.
        Life-threatening respiratory depression is more likely to occur in
        elderly, cachectic, or debilitated patients as they may have altered
        pharmacokinetics or altered clearance compared to younger, healthier
        patients. In patients with significant chronic obstructive pulmonary
        disease or cor pulmonale, and patients having a substantially
        decreased respiratory reserve, hypoxia, hypercapnia, or preexisting
        respiratory depression, XARTEMIS XR may decrease respiratory drive to
        the point of apnea.
      
      - 
        Hypotension, profound sedation, coma, respiratory depression, and
        death may result if XARTEMIS XR is used concomitantly with alcohol or
        other central nervous system (CNS) depressants.
      
- 
        The risk of acute liver failure is higher in individuals with
        underlying liver disease and in individuals who ingest alcohol while
        taking acetaminophen.
      
- 
        Rarely, acetaminophen may cause serious skin reactions such as acute
        generalized exanthematous pustulosis (AGEP), Stevens-Johnson Syndrome
        (SJS), and toxic epidermal necrolysis (TEN), which can be fatal.
      
- 
        The respiratory depressant effects of narcotics and their capacity to
        elevate cerebrospinal fluid pressure may be markedly exaggerated in
        the presence of head injury, other intracranial lesions, or a
        pre-existing increase in intracranial pressure.
      
- 
        Oxycodone may cause severe hypotension particularly in individuals
        whose ability to maintain blood pressure has been compromised by a
        depleted blood volume, or after concurrent administration with drugs
        which compromise vasomotor tone such as phenothiazines.
      
- 
        Due to the potential for acetaminophen hepatotoxicity at doses higher
        than 4000 milligrams/day, XARTEMIS XR should not be used concomitantly
        with other acetaminophen- containing products.
      
- 
        Hypersensitivity and anaphylaxis associated with use of acetaminophen
        have been reported. Clinical signs included swelling of the face,
        mouth, and throat, respiratory distress, urticaria, rash, pruritus,
        and vomiting.
      
- 
        Due to characteristics of the formulation that cause the tablets to
        swell and become sticky when wet, consider use of an alternative
        analgesic in patients who have difficulty swallowing and patients at
        risk for underlying GI disorders resulting in a small gastrointestinal
        lumen. Instruct patients not to pre-soak, lick or otherwise wet
        XARTEMIS XR tablets prior to placing in the mouth, and to take one
        tablet at a time with enough water to ensure complete swallowing
        immediately after placing in mouth.
      
- 
        Opioids diminish propulsive peristaltic waves in the gastrointestinal
        tract and decrease bowel motility. Oxycodone may cause spasm of the
        Sphincter of Oddi and should be used with caution in patients with
        biliary tract disease, including acute pancreatitis.
      
- 
        Since the CYP3A4 isoenzyme plays a major role in the metabolism of
        XARTEMIS XR, drugs that alter CYP3A4 activity may cause changes in
        clearance of oxycodone which could lead to changes in oxycodone plasma
        concentrations.
      
- 
        XARTEMIS XR may impair the mental and/or physical abilities required
        for the performance of potentially hazardous tasks such as driving a
        car or operating machinery. The patient using this drug should be
        cautioned accordingly.
      
      ADVERSE REACTIONS
    
      - 
        Serious adverse events may include respiratory depression and
        hepatotoxicity.
      
- 
        Common adverse events include nausea, dizziness, headache, vomiting,
        constipation and somnolence.
      
      USE IN SPECIFIC POPULATIONS
    
      - 
        Pregnancy: Opioids cross the placenta and may produce respiratory
        depression and psycho-physiologic effects in neonates. Prolonged use
        of XARTEMIS XR during pregnancy can result in withdrawal signs in the
        neonate, which can be life threatening.
      
- 
        Breast feeding: Oxycodone is present in human milk and may result in
        accumulation and toxicities such as sedation and respiratory
        depression in some infants. Acetaminophen is present in human milk in
        small quantities.
      
- 
        Pediatrics: Safety and effectiveness in pediatric patients under the
        age of 18 years have not been established.
      
      See Full
      Prescribing Information for additional Important Risk
      Information including boxed warning.
    
      About XARTEMIS™ XR
    
      XARTEMIS XR is an extended-release oral formulation of oxycodone
      hydrochloride and acetaminophen with immediate-release and
      extended-release components. It is not interchangeable with other
      oxycodone/acetaminophen products because of differing pharmacokinetic
      profiles that affect the frequency of administration. XARTEMIS XR is a
      schedule II controlled substance.
    
      About Mallinckrodt
    
      Mallinckrodt is a global specialty pharmaceutical and medical imaging
      business that develops, manufactures, markets and distributes specialty
      pharmaceutical products and medical imaging agents. Areas of focus
      include analgesics and central nervous system drugs for prescribing by
      office- and hospital-based physicians, and autoimmune and rare disease
      specialty areas like neurology, rheumatology, nephrology and
      pulmonology. The company's core strengths include the acquisition and
      management of highly regulated raw materials; deep regulatory expertise;
      and specialized chemistry, formulation and manufacturing capabilities.
      The company's Specialty Pharmaceuticals segment includes branded and
      specialty generic drugs and active pharmaceutical ingredients, and the
      Global Medical Imaging segment includes contrast media and nuclear
      imaging agents. Mallinckrodt has more than 5,500 employees worldwide and
      a commercial presence in roughly 65 countries. The company's fiscal 2013
      revenue totaled $2.2 billion. To learn more about Mallinckrodt, visit www.mallinckrodt.com.
    

Source: Mallinckrodt
      Mallinckrodt
Lynn Phillips, 314-654-3263
Manager, Media
      Relations
lynn.phillips@mallinckrodt.com
or
Rhonda
      Sciarra, 314-654-8618
Manager, Media Relations
rhonda.sciarra@mallinckrodt.com
or
Meredith
      Fischer, 314-654-6595
Senior Vice President, Communications
meredith.fischer@mallinckrodt.com
or
John
      Moten, 314-654-6650
Vice President, Investor Relations
john.moten@mallinckrodt.com