<prompt> Anti-HIV drug combination that should not be usedZidovudine StavudineAtazanavir Indinavir.Didanosinestavudine ZalcitabineAll of the above.  <response>: Anti-HIV drug combinations that should NOT be used are:Zidovudine Stavudine: Pharmacological antagonism compete for intracellular phosphorylationAtazanavir Indinavir: Additive unconjugated hyperbilirubinemia.Didanosinestavudine Zalcitabine: Additive peripheral neuropathy.Lamivudine Zalcitabine: In vitro antagonism. 