European CHMP Issues Positive Opinion For ATRIPLA(R) (Efavirenz 600mg/Emtricitabine 200 Mg/Tenofovir Disoproxil Fumarate 300 Mg)

Bristol-Myers Squibb Company (NYSE:BMY), Gilead Sciences, Inc. (Nasdaq:GILD) and Merck &
Co., Inc. (NYSE:MRK) announced that the Committee for Medicinal Products for Human Use
(CHMP) of the European Medicines Agency (EMEA) has issued a positive opinion on the Marketing
Authorisation Application for ATRIPLA(R) (efavirenz 600mg/emtricitabine 200 mg/tenofovir
disoproxil fumarate 300 mg). Specifically, the CHMP has recommended ATRIPLA for the treatment
of human immunodeficiency virus-1 (HIV-1) infection in adults with virologic suppression to HIV-1
RNA levels of less than 50 copies/ml on their current combination antiretroviral therapy for more than
three months. Patients must not have experienced virological failure on any prior antiretroviral therapy
and must be known not to have harbored virus strains with mutations conferring significant resistance
to any of the three components contained in ATRIPLA prior to initiation of their first antiretroviral
treatment regimen.

The CHMP’s positive recommendation will be reviewed by the European Commission, which has the
authority to approve medicinal products for use in the 27 countries of the European Union. The
companies expect the European Commission to issue its decision on the marketing authorization for
ATRIPLA toward the end of the year. Once granted by the European Commission, ATRIPLA would
represent the first and only once-daily single tablet regimen for many HIV/AIDS patients in the
European Union.

“Each of the components in ATRIPLA has been shown to be effective and has a well-established
tolerability profile in HIV patients,” said Brian Gazzard, MD, Clinical Research Director, Chelsea and
Westminster Hospital, London. “This first one-pill-a-day treatment for HIV represents a simplification
of dosing, which is important as patients remain on therapy longer.”

Efavirenz is marketed by Bristol-Myers Squibb under the tradename SUSTIVA(R) in the United
States, Canada and six European countries (France, Germany, Republic of Ireland, Italy, Spain and the
United Kingdom). In other territories, including all other countries of the European Union, efavirenz is
commercialized by Merck & Co., Inc., (known as Merck Sharp & Dohme (MSD) in many countries
outside of the United States) and is marketed in most of these countries under the tradename
Stocrin(R). Emtricitabine and tenofovir disoproxil fumarate are commercialized by Gilead under the
tradenames Emtriva(R) and Viread(R), respectively, and are commonly prescribed together as a oncedaily, fixed-dose tablet, marketed under the tradename Truvada(R) for use as part of combination
therapy.

The MAA for ATRIPLA in the European Union was filed jointly by the three companies through a
three-way joint venture based in Ireland called Bristol-Myers Squibb Gilead Sciences And Merck
Sharp & Dohme Limited.

ATRIPLA is currently the first and only once-daily single tablet regimen approved for the treatment of
HIV-1 infection in adults in the United States for use either as stand-alone therapy or in combination
with other antiretroviral agents. ATRIPLA was approved by the U.S. Food and Drug Administration
 
(FDA) in July 2006 and has since become the most-prescribed treatment regimen for patients starting
HIV therapy in the United States.

The FDA also granted approval of an alternate tradedress of ATRIPLA for developing countries,
where ATRIPLA is being made available as a white-colored tablet to distinguish it from the salmoncolored version currently available in the United States. In August 2006, Gilead and Merck established
an agreement for distribution of the product in developing countries, and in March 2007, the World
Health Organization added ATRIPLA to its Model List of Essential Medicines.

Important Product Safety Information About ATRIPLA (efavirenz 600 mg/emtricitabine 200 mg/
tenofovir disoproxil fumarate 300 mg) , Emtriva (emtricitabine), Viread (tenofovir disoproxil fumarate
(DF)) and Truvada (emtricitabine/tenofovir DF) in the United States

Lactic acidosis and severe hepatomegaly with steatosis, including fatal cases, have been reported with
the use of nucleoside analogues alone or in combination with other antiretrovirals.

Emtriva, Viread, Truvada and ATRIPLA are not approved for the treatment of chronic hepatitis B
virus (HBV) infection and their safety and efficacy have not been established in patients co-infected
with HBV and HIV. Severe acute exacerbations of hepatitis B have been reported in patients who have
discontinued Viread or Emtriva, which are components of Truvada and ATRIPLA. In some of these
patients treated with Emtriva, the exacerbations of hepatitis B were associated with liver
decompensation and liver failure. Hepatic function should be monitored closely with both clinical and
laboratory follow-up for at least several months in patients who are co-infected with HIV and HBV
and discontinue Truvada or ATRIPLA. If appropriate, initiation of anti-hepatitis B treatment may be
warranted.

It is important for patients to be aware that anti-HIV medicines including Truvada, Viread, Emtriva,
SUSTIVA and ATRIPLA do not cure HIV infection or AIDS and do not reduce the risk of
transmitting HIV to others.

Additional Important Information About ATRIPLA in the United States

ATRIPLA(R) (efavirenz 600 mg/emtricitabine 200 mg/tenofovir disoproxil fumarate 300 mg) is
indicated for use alone as a complete regimen or in combination with other antiretroviral agents for the
treatment of HIV-1 infection in adults.

Coadministration of ATRIPLA with astemizole, bepridil, cisapride, midazolam, pimozide, triazolam,
ergot derivatives, or voriconazole is contraindicated. Concomitant use of ATRIPLA with St. John’s
wort (Hypericum perforatum) or St. John’s wort-containing products is not recommended.

Since ATRIPLA contains efavirenz, emtricitabine, and tenofovir DF, ATRIPLA should not be
coadministered with SUSTIVA(R) (efavirenz), EMTRIVA, VIREAD, or TRUVADA(R)
(emtricitabine/tenofovir DF). Due to similarities between emtricitabine and lamivudine, ATRIPLA
should not be coadministered with drugs containing lamivudine, including Combivir(R)
(lamivudine/zidovudine), Epivir(R) or Epivir-HBV(R) (lamivudine), Epzicom(TM) (abacavir
sulfate/lamivudine), or Trizivir(R) (abacavir sulfate/lamivudine/zidovudine).

Serious psychiatric adverse experiences, including severe depression (2.4%), suicidal ideation (0.7%),
nonfatal suicide attempts (0.5%), aggressive behavior (0.4%), paranoid reactions (0.4%), and manic
reactions (0.2%), have been reported in patients receiving efavirenz. In addition to efavirenz, factors
identified in a clinical study that were associated with an increase in psychiatric symptoms included a
 
history of injection drug use, psychiatric history, and use of psychiatric medication. There have been
occasional reports of suicide, delusions, and psychosis-like behavior, but it could not be determined if
efavirenz was the cause. Patients with serious psychiatric adverse experiences should be evaluated
immediately to determine whether the risks of continued therapy outweigh the benefits.

Fifty-three percent of patients reported central nervous system symptoms (including dizziness
(28.1%), insomnia (16.3%), impaired concentration (8.3%), somnolence (7.0%), abnormal dreams
(6.2%), and hallucinations (1.2%)) when taking efavirenz compared to 25% of patients receiving
control regimens. These symptoms usually begin during Days 1-2 of therapy and generally resolve
after the first 2-4 weeks of therapy; they were severe in 2.0% of patients, and 2.1% of patients
discontinued therapy. After 4 weeks of therapy, the prevalence of nervous system symptoms of at least
moderate severity ranged from 5% to 9% in patients treated with regimens containing efavirenz.
Nervous system symptoms are not predictive of the less frequent psychiatric symptoms.

It is recommended that creatinine clearance (CrCl) be calculated in all patients prior to initiating
therapy and as clinically appropriate during therapy with ATRIPLA, and routine monitoring of CrCl
and serum phosphorous be performed for patients at risk of renal impairment. ATRIPLA should not be
given to patients with CrCl less than 50 mL/min. Renal impairment, including cases of acute renal
failure and Fanconi syndrome (renal tubular injury with severe hypophosphatemia), has been reported
in association with the use of tenofovir DF. ATRIPLA should be avoided with concurrent or recent
use of a nephrotoxic agent.

ATRIPLA may cause fetal harm when administered during the first trimester to a pregnant woman.
Women should not become pregnant or breast-feed while taking ATRIPLA. Barrier contraception
must always be used in combination with other methods of contraception (eg, oral or other hormonal
contraceptives). If the patient becomes pregnant while taking ATRIPLA, she should be apprised of the
potential harm to the fetus.

Mild-to-moderate rash is a common side effect of efavirenz. In controlled clinical trials, 26% of
patients treated with efavirenz experienced new-onset skin rash compared with 17% of patients treated
in control groups. ATRIPLA should be discontinued in patients developing severe rash associated with
blistering, desquamation, mucosal involvement, or fever. Skin discoloration, associated with
emtricitabine, may also occur.

Liver enzymes should be monitored in patients with known or suspected hepatitis B or C and when
ATRIPLA is administered with ritonavir or other medications associated with liver toxicity.

Decreases in bone mineral density (BMD) have been seen with tenofovir DF. Cases of osteomalacia
(associated with proximal renal tubulopathy) have been reported in association with the use of
tenofovir DF.

Use ATRIPLA with caution in patients with a history of seizures. Convulsions have been observed in
patients receiving efavirenz, generally in the presence of known medical history of seizures.

Redistribution/accumulation of body fat has been observed in patients receiving antiretroviral therapy.

Immune reconstitution syndrome has been reported in patients treated with combination antiretroviral
therapy, including the components of ATRIPLA.

Saquinavir should not be used as the only protease inhibitor in combination with ATRIPLA.

Coadministration of ATRIPLA and atazanavir is not recommended due to concerns regarding
decreased atazanavir concentrations. Atazanavir and lopinavir/ritonavir have been shown to increase
tenofovir concentrations. Patients on atazanavir or lopinavir/ritonavir plus ATRIPLA should be
monitored for tenofovir-associated adverse events. ATRIPLA should be discontinued in patients who
develop tenofovir-associated adverse events.

Coadministration of ATRIPLA with didanosine should be undertaken with caution. Patients receiving
this combination should be monitored closely for didanosine-associated adverse events. See U.S. Full
Prescribing Information for complete list of drug-drug interactions.

In Study 934, the most frequently reported grades 2-4 adverse events through 48 weeks in patients
receiving efavirenz + emtricitabine + tenofovir DF were dizziness (8%), nausea (8%), diarrhea (7%),
fatigue (7%), headache (5%), rash (5%), sinusitis (4%), depression (4%), insomnia (4%), and
abnormal dreams (4%).

The dose of ATRIPLA is one tablet (containing 600 mg of efavirenz, 200 mg of emtricitabine, and
300 mg of tenofovir DF) once daily taken orally on an empty stomach. Dosing at bedtime may
improve the tolerability of nervous system symptoms. ATRIPLA is not recommended for use in
patients less than 18 years of age.

For complete U.S. prescribing information for ATRIPLA, visit http://www.atripla. For complete
prescribing information for Sustiva, visit http://www.bms. For complete U.S. prescribing information
for Truvada, Viread and Emtriva, visit gilead.

About Bristol-Myers Squibb

Bristol-Myers Squibb is a global pharmaceutical and related healthcare products company. Visit
Bristol-Myers Squibb on the World Wide Web at bms.

About Gilead Sciences

Gilead Sciences is a biopharmaceutical company that discovers, develops and commercializes
innovative therapeutics in areas of unmet medical need. The company’s mission is to advance the care
of patients suffering from life-threatening diseases worldwide. Headquartered in Foster City,
California, Gilead has operations in North America, Europe and Australia. Visit Gilead on the World
Wide Web at gilead.

About Merck

Merck & Co. Inc., which operates in many countries as Merck Sharp & Dohme (MSD), is a global
research-driven pharmaceutical company dedicated to putting patients first. Established in 1891,
Merck currently discovers, develops, manufactures and markets vaccines and medicines to address
unmet medical needs. The Company devotes extensive efforts to increase access to medicines through
far-reaching programs that not only donate Merck medicines but also help deliver them to the people
who need them. Merck also publishes unbiased health information as a not-for-profit service. For more
information, visit merck.

Forward-Looking Statements

Bristol-Myers Squibb Forward-Looking Statement

This press release contains “forward-looking statements” as that term is defined in the Private
Securities Litigation Reform Act of 1995 regarding product development. Such forward-looking
statements are based on current expectations and involve inherent risks and uncertainties, including
factors that could delay, divert or change any of them, and could cause actual outcomes and results to
differ materially from current expectations. No forward-looking statement can be guaranteed. Among
other risks, there can be no guarantee that the combination product will receive regulatory approval in
the European Union or other geographies. Forward-looking statements in this press release should be
evaluated together with the many risks and uncertainties that affect Bristol-Myers Squibb’s business,
including those identified in Bristol-Myers Squibb’s Annual Report on Form 10-K for the year ended
December 31, 2006 and in our Quarterly Reports on Form 10-Q, particularly under “Item 1A. Risk
Factors”. Bristol-Myers Squibb undertakes no obligation to publicly update any forward-looking
statement, whether as a result of new information, future events or otherwise.

Gilead Forward-Looking Statement
This press release includes forward-looking statements, within the meaning of the Private Securities
Litigation Reform Act of 1995, that are subject to risks, uncertainties and other factors, including the
risk that the European Commission will not formally approve ATRIPLA for marketing in the
European Union prior to the end of the year or at all, and any marketing approval, if granted, may have
significant limitations on its use. In addition, Gilead, Bristol-Myers Squibb and Merck may be unable
to reach agreement related to the manufacture, commercialization and distribution of ATRIPLA in the
European Union in a timely manner or at all. These risks, uncertainties and other factors could cause
actual results to differ materially from those referred to in the forward-looking statements. The reader
is cautioned not to rely on these forward-looking statements. These and other risks are described in
detail in the Gilead’s Annual Report on Form 10-K for the year ended December 31, 2006 and its
Quarterly Reports on Form 10-Q for the first two quarters of 2007, filed with the U.S. Securities and
Exchange Commission. All forward-looking statements are based on information currently available
to Gilead and Gilead assumes no obligation to update any such forward-looking statements.

Merck Forward-Looking Statement
This press release contains “forward-looking statements” as that term is defined in the Private
Securities Litigation Reform Act of 1995. These statements are based on management’s current
expectations and involve risks and uncertainties, which may cause results to differ materially from
those set forth in the statements. The forward-looking statements may include statements regarding
product development, product potential or financial performance. No forward-looking statement can
be guaranteed and actual results may differ materially from those projected. Merck undertakes no
obligation to publicly update any forward-looking statement, whether as a result of new information,
future events, or otherwise. Forward-looking statements in this press release should be evaluated
together with the many uncertainties that affect Merck’s business, particularly those mentioned in the
risk factors and cautionary statements in Item 1A of Merck’s Form 10-K for the year ended Dec. 31,
2006, and in its periodic reports on Form 10-Q and Form 8-K, which the Company incorporates by
reference.

Full U.S. prescribing information for ATRIPLA is available at atripla.

Full U.S. prescribing information for SUSTIVA is available at bms.

Full U.S. prescribing information for Truvada, Viread and Emtriva are available at gilead.

EU Summary of Product Characteristics for Truvada, Viread, Emtriva, SUSTIVA and Stocrin are
available here.

ATRIPLA is a registered trademark of Bristol-Myers Squibb & Gilead Sciences, LLC.

SUSTIVA is a registered trademark of Bristol-Myers Squibb Pharma Company.

Stocrin is a registered trademark of Merck & Co., Inc.

Truvada, Viread and Emtriva are all registered trademarks of Gilead Sciences, Inc.

emea.europa.eu/

View drug information on Sustiva; Viread.

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