is a lousy drug nowadays given the high risk of resistance of the virus to this medication (meaning that the medication stops working against the virus).
Viread is a great drug in this regards, however if you are having bad side effects and can't tolerate it you may needs to be switched to another one. There is no life threatening danger if you stop the medication, you are just at an increased risk of developing resistance to Viread as well.
You do need to be on something to prevent hepatocellular carcinoma
. Another alternative is Entecavir.
Hope that helps.