Inform your doctor if any of the following occurs:
Ribavirin may reduce efficacy of an influenza vaccine
Ribavirin may increase toxicities of azathioprine
Significant teratogenic and/or embryocidal effects have been demonstrated. Not to be taken by pregnant women and male partners of women who are pregnant. Take care to avoid pregnancy during therapy and for 6 months after completion of treatment in both female patients and female partners of male patients on ribavirin therapy. At least 2 reliable forms of effective contraception must be utilized during this period.