Thanks for writing in.
I am a qualified and certified cardiologist. I read your question with diligence.
You are right viraferon
injection has cardiovascular side effects like arrhythmia
and in diabetes
incidence of side effects are more. Here, the treating doctor judges the risk benefit analysis. Risk of giving a therapy is weighed against the benefits one wants to achieve. In patients like your mother a targeted monitoring is done during the therapy. Physician has option to stop the therapy midway also if risks outweighs the benefits and all precautions to treat side effects are taken. Decision to administer a drug like this is not taken in isolation and you can discuss with your doctor about your apprehension he will be glad to tell you the precautions he has taken. Good Luck.
With Best Wishes
Dr Anil Grover