Synergism This occurs when one compound enhances the effect of another many times beyond what would be experienced if either were encountered alone.(Like alcohol and drugs). Constant exposure to various pesticides throughout out the day.Synergism Th h d h his occurs when one compound enhances the effect of another many times beyond wh ld b d f h hat would be experienced if either were encountered alone. (Like alcohol and d ) rugs . Constant exp p osure to various pesticides throughout out the day