Washington, Sep 1 - Loss of libido and impaired sex is common among those undergoing antiviral therapy for chronic hepatitis C, according to a new study.

This is the first time a study evaluating the combination therapy, peginterferon and ribavirin, has identified sexual dysfunction (inability to fully enjoy sexual intercourse) as a side effect.

The therapy has the potential to affect all three components of sexual health: desire, function and satisfaction.

Before therapy, 37 percent of men reported at least some degree of diminished desire, while 44 percent reported dissatisfaction with their sexual life. Besides, 22 percent reported poor erection and 26 percent reported poor ejaculation.

The average onset of sexual dysfunction appeared to be within four weeks of starting antiviral therapy, and many patients reported a gradual worsening over time.