GSK Receives FDA Approval For Raxibacumab Anti-toxin For The Treatment Of Inhalational Anthrax

The safety of raxibacumab has been evaluated in 326 healthy adult volunteers treated with the recommended dose. Infusion reactions were reported in clinical trials including reports of rash, urticaria (hives) and pruritus (itching). If these reactions occur, slow or interrupt raxibacumab infusion and administer appropriate treatment based on the severity of the reaction. Patients should be premedicated with diphenhydramine (an antihistamine) before treatment. The most frequently reported adverse reactions (less than or equal to 1.5%) were rash, pain in an extremity (arms and legs), pruritus (itching) and somnolence.

The recommended adult dosage of raxibacumab is a single dose of 40 mg/kg given intravenously over a period of two hours and 15 minutes. Administer diphenhydramine within an hour of treatment to reduce the risk of infusion reactions. The recommended dose for children is based on weight.

Raxibacumab is not approved or licensed in Europe and currently is not approved in other parts of the world for the treatment or prophylaxis of patients with inhalational anthrax. For Full US Prescribing Information, please visit, http://www.gsk.com/products/index.htm

About raxibacumabRaxibacumab was discovered and developed by Human Genome Sciences (HGS) in conjunction with the Biomedical Advanced Research and Development Authority (BARDA) of the Office of the Assistant Secretary for Preparedness and Response (ASPR), U.S. Department of Health and Human Services (HHS) under contract number HHS010020050006C.  It is now part of GSK's portfolio, following GSK's acquisition of HGS in July 2012.  The development of raxibacumab is the result of a coordinated response to a recognised public health threat and the US government's request for new medical countermeasures in the event of an anthrax attack against the civilian population. The US Government is currently the sole recipient of raxibacumab supplies.

GlaxoSmithKline – one of the world's leading research-based pharmaceutical and healthcare companies – is committed to improving the quality of human life by enabling people to do more, feel better and live longer.  For further information please visit www.gsk.com

Cautionary statement regarding forward-looking statementsUnder the safe harbor provisions of the U.S. Private Securities Litigation Reform Act of 1995, GSK cautions investors that any forward-looking statements or projections made by GSK, including those made in this announcement, are subject to risks and uncertainties that may cause actual results to differ materially from those projected. Factors that may affect GSK' s operations are described under 'Risk factors' in the 'Financial review & risk' section in the company's Annual Report 2011 included as exhibit 15.2 to the company's Annual Report on Form 20-F for 2011.

SOURCE GlaxoSmithKline plc

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