Meta-analysis with RCTs is commonly used to evaluate treatments and inform policy decisions because it provides the best summaries of all available evidence. However, meta-analyses are limited to draw population inference of treatment effects because they usually do not define target populations of interest specifically and results of the individual RCTs in those meta-analyses may not generalize to target populations. We extend generalizability methods for a single RCT to meta-analysis with individual participant-level data. We apply these methods to generalize meta-analysis results from RCTs of treatments on schizophrenia to adults with schizophrenia who present to usual care settings in the US.