There are some reports of side effects of varying degree, but in general Harvoni&#x27;s side effects are extremely mild.<p>When I did the trial, my physician indicated that in previous trials, patients couldn&#x27;t reliably distinguish Harvoni from a placebo.  My experience aligns with this statement.<p>While I was on a 24 week trial (longer than most people today) with ribavirin (which is only used with a minority of patients today), I experienced nothing I could directly attribute to the medication.  My viral load dropped to undetectable in six weeks, and has remained so since.