A pharmaceutical composition comprises at least one integrase inhibitor or its salt, solvate, complex, hydrate, isomer, ester, tautomer, anhydrate, enantiomer, polymorph or prodrug and at least one antiretroviral or anti-HIV agent or its salt, solvate, complex, hydrate, isomer, ester, tautomer, anhydrate, enantiomer, polymorph or prodrug.