Blazars are a class of active galactic nuclei (AGN) characterized by large luminosity that varies on relatively short timescales. Using a generic emission model for the broad line region (BLR) we calculate the interaction of gamma-rays in the jet with BLR photons, and the distribution of the secondary electron-positron (e$^\pm$) pairs produced. We also calculate the synchrotron and inverse Compton emission by the e$^\pm$ pairs, which constitute a source of secondary gamma-ray emission. We fit the spectral energy distributions (SEDs) of some bright \textit{Fermi}-LAT blazars, and study the effect of these considerations on the observed gamma-ray flux of blazars.