Medivir Notes That Partner Tibotec Announced Week 24 Interim Results From Phase 2b TMC435 PILLAR Study to be Presented as a Late-Breaker at AASLD

HUDDINGE, Sweden, November 1, 2010 - Medivir AB (OMX:MVIR), the research-based speciality pharmaceutical
company focused on the development of high-value treatments for infectious
diseases, notes that its development partner, Tibotec Pharmaceuticals, has
announced the results of a Week-24 planned interim analysis of the Phase 2
response-guided PILLAR study for TMC435, Medivir's key pipeline asset, a
hepatitis C protease inhibitor dosed once-daily. The study was conducted in
treatment-naive patients with chronic genotype 1 Hepatitis C virus (HCV) and
is part of a late-breaker oral presentation at the 61st Annual Meeting of the
American Association for the Study of Liver Diseases (AASLD) in Boston, MA.,
USA.

Highlights of the data:

    - 79% to 86% of patients were able to stop all therapy at
      week-24
    - No relevant differences for adverse events between TMC435
      treatment groups and placebo

Commenting on the announcement by Medivir's development partner, Tibotec,
Ron Long, Chief Executive of Medivir, said: "We are very pleased to have such
exciting TMC435 data presented by our partner, Tibotec, at the AASLD. The
data announced shows the significant impact that TMC435 could have on the way
we treat hepatitis C."

Please note that Medivir will be hosting meetings for Investors, Analysts
and the Media at the AASLD (see end of press release).

Tibotec released the following statement on the results on Saturday 30th
October:

Week 24 interim results from phase 2b PILLAR study to be presented as
late-breaker at AASLD

— Data show high antiviral activity, safety and tolerability comparable
to placebo

Boston, MA. Saturday 30th October 2010 - Tibotec Pharmaceuticals
(Tibotec) today will present the results of a Week-24 planned interim
analysis of the phase 2 response-guided PILLAR study in treatment-naive
patients with chronic genotype 1 hepatitis C virus (HCV) as part of a
late-breaker oral presentation at the 61st Annual Meeting of the American
Association for the Study of Liver Diseases (AASLD) in Boston, MA., USA.

The results showed that in the four TMC435 treatment groups between 79
and 86 percent of patients were able to stop all therapy at Week-24,
according to the response criteria defined in the study protocol. There were
no relevant differences for adverse events between TMC435 treatment groups
and placebo. TMC435, a hepatitis C protease inhibitor, dosed once daily
(q.d.) is being developed jointly by Tibotec Pharmaceuticals and Medivir.

The PILLAR study [Protease Inhibitor TMC435 trial assessing the optimaL
dose and duration as once daiLy Anti-viral Regimen] (TMC435-C205;
NCT00882908) is an ongoing, five-arm, global phase 2b randomized,
double-blind, placebo controlled study in 386 treatment-naive patients.
TMC435 was administered in doses of 75mg or 150mg q.d. for either 12 weeks or
24 weeks in combination with 24 weeks of peg-interferon and ribavirin (PR).
Patients in the placebo arm receive 24 weeks of placebo plus peg-interferon
and ribavirin followed by 24 additional weeks of peg-interferon and ribavirin
treatment. The primary endpoint of the study is sustained virologic response
at Week-72 (SVR24). The PILLAR study is being conducted in 13 countries in
Europe, North America, and Australasia.

Patients receiving TMC435 were allowed to stop all treatment at week 24
when a) HCV RNA levels < 25 IU/mL at week 4 and b) HCV RNA < 25 IU/mL levels
at weeks 12, 16 and 20. Patients who did not meet the above response-guided
criteria continued with peg-interferon and ribavirin until Week-48. TMC435
demonstrated potent antiviral activity, at week 4 (rapid virologic response
(RVR)) and at week 12 (complete early virologic response (cEVR)) HCV RNA was
undetectable (<25IU/ml) for the majority of patients. The viral breakthrough
rate was 4.9 percent in the TMC435 treatment groups.

"Chronic infection with HCV is a leading cause of cirrhosis, liver
cancer, and liver transplantation worldwide" said Dr Michael W. Fried M.D.,
lead clinical investigator and Professor of Medicine, Director of Hepatology,
University of North Carolina at Chapel Hill. "We are extremely encouraged by
these data for TMC435."

The goal of HCV treatment is to achieve SVR24, which means the virus
remains undetectable in patients' blood six months after they have finished
treatment. Patients who achieve SVR are considered cured. The current
standard of care for HCV, pegylated interferon combined with ribavirin, may
cause debilitating side effects[i] and cures only about half of patients
starting therapy for the first time.[1]

The most common adverse events were headache and fatigue, 46 percent and
42 percent in the TMC435 groups and 51 percent and 47 percent in the placebo
group respectively. There were no clinically significant differences in
frequency of rash, anemia or gastrointestinal events between the TMC435
groups and placebo. Most AEs were mild to moderate in severity. AEs leading
to treatment discontinuation were reported in 7.1 percent of patients in
TMC435 arms and 7.8 percent in placebo arm.

In laboratory parameters, significant decreases in transaminases (ALT and
AST) were observed in all treatment groups. Small and transient bilirubin
elevations (direct and indirect) were seen in the TMC435 150mg dose groups.

"With a strong heritage in virology, Tibotec is committed to improving
the lives of those impacted by HCV through the development of innovative new
treatment regimens," said Greg Fanning PhD, head of hepatitis C research and
development at Tibotec. "TMC435 is an important component of our growing HCV
pipeline and we are encouraged by the results of the interim analysis
presented at the AASLD meeting."

TMC435 is also being studied in HCV genotype-1 treatment-experienced
patients who have failed treatment with peg-interferon and ribavirin. The
ASPIRE study (Antiviral STAT-C Protease Inhibitor Regimen in Experienced
patients; TMC435-C206; NCT00980330) is an ongoing global phase 2b randomized,
double-blind, placebo controlled study in 463 patients.

In addition to the late-breaker oral presentation described above, data
on TMC435 has been presented in 4 posters at AASLD:

    278. "In vitro studies investigating the mechanism of interaction between
    TMC435 and hepatic transporters." M.T. Huisman

    812. "Virologic analysis of genotype-1-infected patients treated with
    once-daily TMC435 during the Optimal Protease inhibitor Enhancement of
    Response to Therapy (OPERA)-1 study." O. Lenz

    895. "A Phase IIa, open-label study to assess the antiviral activity of
    TMC435 monotherapy in patients infected with HCV genotypes 2-6." C.
    Moreno

    1873. "Pharmacokinetic-pharmacodynamic analyses of TMC435 in patients
    infected with Hepatitis C Virus (HCV) genotypes 2 to 6." V. Sekar

About HCV

HCV is a blood-borne infectious disease that affects the liver.[1] With
an estimated 170 million people infected worldwide1 and three to four million
people newly infected each year,[2] HCV puts a significant burden on patients
and society. Chronic infection with HCV can lead to liver cancer and other
serious and fatal liver diseases, and is the most common cause of liver
transplant worldwide.[3] Discovering and developing new treatments is very
important to improving the standard of care for the millions of people living
with this disease.

About Tibotec Pharmaceuticals

Tibotec Pharmaceuticals is a global pharmaceutical and research
development company. The Company's main research and development facilities
are in Beerse, Belgium with offices in Titusville, NJ and Cork, Ireland.
Tibotec is dedicated to the discovery and development of innovative HIV/AIDS
and hepatitis C drugs, and anti-infectives for diseases of high unmet medical
need. Tibotec Pharmaceuticals is a subsidiary of Johnson & Johnson.

[1]World Health Organization (2002). Hepatitis C. Retrieved October 26,
2010 from www.who.int/csr/disease/hepatitis/Hepc.pdf

[2] Hepatitis C: Global Prevalence. Weekly Epidemiological Record.
1997;72: 341-8. Retrieved October 26, 2010 from
www.who.int/docstore/wer/pdf/1997/wer7246.pdf.

[3] Roche B, Samuel D., Villejuif, France. Risk factors for hepatitis C
recurrence after liver transplantation. J Viral Hepat. 2007 Nov;14. Suppl
1:89-96.

Medivir Activities for Investors, Analysts and the Media at the AASLD:

Medivir will provide an update on the development of TMC435 and the data
presented at AASLD on Tuesday 2 November, 2010. The meetings will be hosted
by Rein Piir (CFO/IR), Bertil Samuelsson, (CSO) and Asa Rosenquist,
(Director).

Medivir Conference Call For European Analysts and Investors:

Tuesday, November 2, 2010 at 6.30am EDT / 10.30am GMT / 11.30am CET

Please register for the conference call online at:
invite.taylor-rafferty.com/_Medivir/ConferenceCall

You will receive the dial-in and replay numbers for the conference call
following your online registration.

Breakfast Meeting for US based Analysts, Investors and Media at AASLD:

Tuesday November 2, 2010 at 7:00am - 8.30am EDT (breakfast will be served
between 7:00am - 7.30am EDT)

Venue: Colonnade Hotel, Braemore & Kenmore Room, 120 Huntington Avenue,
Boston

Please confirm your participation by registering on-line:

invite.taylor-rafferty.com/_Medivir/Breakfast/default.htm

About Medivir

Medivir is a research-based specialty pharmaceutical company focused on
the development of high-value treatments for infectious diseases. Medivir has
world class expertise in polymerase and protease drug targets and drug
development. Medivir has a strong R&D portfolio and has recently launched its
first product Xerese(TM)/Xerclear(TM). Medivir's key pipeline asset, TMC435,
a protease inhibitor, is in phase 2b clinical development for Hepatitis C and
is partnered with Tibotec Pharmaceuticals.

Xerese(TM)/Xerclear(TM) is an innovative treatment for cold sores, which
has been approved in both the US and Europe. It is partnered with GSK to be
sold OTC in Europe and Russia and with Meda in North America. Medivir has
retained the Rx rights for Xerclear(TM) in Sweden and Finland.

For more information about Medivir, please visit the Company's website:
www.medivir.se.

About TMC435 clinical trial programs

TMC435 is a once daily protease inhibitor jointly developed by Medivir
and Tibotec Pharmaceuticals to treat hepatitis C virus infections. TMC435 is
currently being studied in three phase 2b clinical trials (TMC435-C205,
TMC435-C206 and TMC435-C215) in genotype 1 (G1) treatment-naive and in G1
patients that failed previous IFN-based treatment. TMC435 is planned to enter
phase 3 studies early 2011.

PILLAR Study (TMC435-C205)

TMC435-C205 is an ongoing randomized double-blind global phase 2b study
in 386 genotype-1 treatment-naive patients. It evaluates once daily treatment
of TMC435 with different doses and durations given in addition to standard of
care treatment, consisting of ribavirin and pegIFNalpha-2A.

ASPIRE Study (TMC435-C206)

TMC435-C206 is an ongoing randomized double-blind global phase 2b study
in 463 genotype-1 treatment-experienced patients. It evaluates once daily
treatment of TMC435 in with different doses of given in addition to standard
of care treatment, consisting of ribavirin and pegIFNalpha-2A.

TMC435-C215

TMC435-C215 is an ongoing Japanese phase 2b study in 92 genotype-1
treatment-naive patients. It evaluates once daily treatment of TMC435 with
different doses and durations given in addition to standard of care
treatment, consisting of ribavirin and pegIFNalpha-2A.

Opera-2 (TMC435-C202)

TMC435-C202 is a completed phase 2a study in treatment-naive genotype 2
to 6 HCV patients. It is a once daily treatment of TMC435 during seven days,
at 200 mg. Subsequently, patients could continue with Standard of Care
treatment consisting of pegylated interferon and ribavirin upon agreement
with the study doctor.

    For more information about Medivir, please contact:

    Medivir (www.medivir.se)
    Rein Piir, CFO & VP Investor Relations
    Office: +46-8-546-831-23
    Mobile: +46-708-537-292

    M:Communications: Medivir@mcomgroup.com
    Europe: Mary-Jane Elliott / Emma Thompson / Amber Bielecka:
    +44(0)20-7920-2330
    USA: Jason Marshall: +1-212-897-5497

    For enquiries about the above briefings, please contact: Lindsey Neville
    at M:Communications on +44(0)20-7920-2333 or Jason Marshall on
    +1-212-889-4350 or email Neville@mcomgroup.com

For more information about Medivir, please contact: Medivir, Rein Piir, CFO & VP Investor Relations: Office: +46-8-546-831-23, Mobile: +46-708-537-292; M:Communications: Medivir at mcomgroup.com, Europe: Mary-Jane Elliott / Emma Thompson / Amber Bielecka: +44(0)20-7920-2330, USA: Jason Marshall: +1-212-897-5497; For enquiries about the above briefings, please contact: Lindsey Neville at M:Communications on +44(0)20-7920-2333 or Jason Marshall on +1-212-889-4350 or email Neville at mcomgroup.com