Celbarin Ribavirin Peginterferon alfa-2a [Pegylated Interferon alfa-2a]
ModeratePeginterferon alfa-2a taken with ribavirin can affect other medicines. Theophylline levels may rise. Methadone needs watching for toxicity. Zidovudine may worsen low white blood cells or anemia. Azathioprine is also listed.
These medicines are often taken together with some care. Your doctor may change a dose, space them apart or check on you more often. Make sure your doctor and pharmacist know you take both.
What to do: Ask your doctor or pharmacist before taking these together. They may check you or change the plan.