Interferon treatment has painful side effects, takes six months to a year to show results, and is very expensive. If the treatment fails, it will still have cost a considerable amount of money and suffering.
服用干擾素既要忍受痛苦的副作用，而且必須服用半年至一年才知道是否有療效，再加上所費不貲，如果無效，不但錢白花，苦也白受。