Dizziness, Flatulence, diarrhoea, vomiting,nausea, are very common side effects.

Viread belongs to a class of antiretroviral drugs known as nucleotide analogue reverse transcriptase inhibitors (NtRTIs), which block reverse transcriptase, an enzyme crucial to viral production in HIV-infected people. Viread is currently in late-stage clinical trials for the treatment of hepatitis B. Viread disoproxil fumarate is an acyclic nucleoside phosphonate diester analog of adenosine monophosphate. Viread requires initial diester hydrolysis for conversion to Viread and subsequent phosphorylations by cellular enzymes to form Viread diphosphate. Viread diphosphate is a weak inhibitor of mammalian DNA polymerases α, β, and mitochondrial DNA polymerase Y.