IL-1β did not significantly change following treatment in schizophrenia (g: −0.25; CI −0.53 to 0.04; p = 0.086; I2 = 49%) and in MDD (g: −0.42; CI −1.40 to 0.55; p = 0.393; I2 = 88%). This evidence concerns the gene IL1B and schizophrenia.