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                Merck Announces 
                  Expanded Co-Pay AssistanceProgram for Isentress (raltegravir)
 
 Enhanced Program Provides Assistance to People Living with 
                  HIV-1 Who are Privately Insured and Have Out-of-Pocket Co-Pays
 Whitehouse 
                  Station, N.J. -- October 22, 2010 -- Merck today announced an 
                  enhanced co-pay assistance program for people living with HIV-1 
                  who are taking the Company's first-in-class HIV-1 integrase 
                  inhibitor, Isentress (raltegravir) Tablets. The program provides 
                  important savings for privately-insured patients with out-of-pocket 
                  costs for Isentress, and is part of Merck's ongoing commitment 
                  to providing access to treatment.   
                People 
                  who have been prescribed Isentress who meet certain requirements 
                  are eligible to participate in the program, in which they can 
                  receive a Savings Coupon for up to $400 toward out-of-pocket 
                  costs on each of up to 12 eligible prescriptions of Isentress, 
                  regardless of the number of tablets supplied on the prescription. 
                  The program applies to eligible patients who have private health 
                  insurance with a co-payment for the prescription. Savings are 
                  limited to co-pay amount and eligibility restrictions, terms 
                  and conditions apply.
 "This 
                  effort, along with Merck's ongoing collaboration with AIDS Drug 
                  Assistance Programs (ADAPs), further reinforces the Company's 
                  long-standing commitment to providing access to our medicines," 
                  said Patrick Bergstedt, senior vice president and general manager, 
                  Merck Infectious Diseases Franchise. "Given today's economic 
                  climate, programs that help alleviate the high co-pay costs 
                  that many HIV-1 patients face are increasingly important.
 
 "The 
                  program is not available to patients who are covered under Medicaid, 
                  Medicare, a Medicare Part D or Medicare Advantage plan (regardless 
                  of whether a specific prescription is covered), TRICARE, CHAMPUS, 
                  Government Health Insurance Plan ("Healthcare Reform"), 
                  or any other state or federal medical or pharmaceutical benefit 
                  program or pharmaceutical assistance program, or to residents 
                  of Massachusetts. Participants must be residents of the United 
                  States or the Commonwealth of Puerto Rico to be eligible for 
                  the program.
 
 Eligible patients can enroll in the Savings Coupon program and 
                  receive additional information about co-pay assistance by calling 
                  1-877-264-2440 or at www.Isentress.com. 
                  The Savings Coupon for Isentress expires Sept. 30, 2012.
 
 Important information about Isentress
 
 Isentress is indicated in combination with other antiretroviral 
                  agents for the treatment of HIV-1 infection in adults. The label 
                  for Isentress is based on analyses of plasma HIV-1 RNA levels 
                  through 96 weeks in three double-blind controlled clinical studies 
                  of Isentress. Two of these studies were conducted in clinically 
                  advanced, three-class antiretroviral (ARV) [non-nucleoside reverse 
                  transcriptase inhibitor (NNRTI), nucleoside reverse transcriptase 
                  inhibitor (NRTI), protease inhibitor (PI)] treatment-experienced 
                  adults and one was conducted in treatment-naive adults.
 
 The safety and efficacy of Isentress have not been established 
                  in pediatric patients. The use of other active agents with Isentress 
                  is associated with a greater likelihood of treatment response.
 
 SUPPORT Program
 
 The SUPPORT Program is designed to help patients who have been 
                  prescribed Isentress or Crixivan (indinavir sulfate). The SUPPORT 
                  Program is a two-part program that consists of free reimbursement 
                  support services and a patient assistance program for eligible 
                  individuals through a single toll-free call to 1-800-850-3430. 
                  For Information about this program and others, please visit 
                  www.merckhelps.com.
 
 About Isentress
 
 Isentress is the first medicine to be approved in a class 
                  of antiretroviral drugs called integrase inhibitors. Isentress 
                  works by inhibiting the insertion of HIV-1 DNA into human DNA 
                  by the integrase enzyme and has demonstrated rapid antiviral 
                  activity. Inhibiting integrase from performing this essential 
                  function limits the ability of the virus to replicate and infect 
                  new cells. Other HIV-1 drugs in use inhibit two other enzymes 
                  critical to the HIV-1 replication process -- protease and reverse 
                  transcriptase -- but Isentress is the only approved drug that 
                  inhibits the integrase enzyme. Isentress is now approved in 
                  more than 90 countries worldwide. Merck is continuing to move 
                  forward with filings in additional countries around the world 
                  for use of ISENTRESS in both treatment-experienced and treatment-naive 
                  patients.
 
 About Merck
 
 
  Today's 
                  Merck is a global healthcare leader. Merck is known as MSD outside 
                  the United States and Canada. Through our prescription medicines, 
                  vaccines, biologic therapies, and consumer care and animal health 
                  products, we work with customers and operate in more than 140 
                  countries to deliver innovative health solutions. We also demonstrate 
                  our commitment to increasing access to healthcare through far-reaching 
                  policies, programs and partnerships. 
 For more information, visit www.merck.com.
 10/29/10
 
  
              SourceMerck. 
                Merck Announces Expanded Co-Pay Assistance Program for Isentress 
                (raltegravir). Press release. October 22, 2010.
 
   
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