Hi Labu,
I think @Suresh786 has HDV and has had interferon treatment. Perhaps he can provide you with some of his expereinces.
There is a thread here about what is known about the side-effects of interferon: Peg interferon treatment - #4 by PLampertico
There are also others who have had interferon treatment for HBV only; I think @PuallyHBV, @kk9, @Listowel, and @Ecky all have experience with interferon. Perhaps they can provide some comments.
Thomas