Risperidone and haloperidol have also shown effectiveness in the treatment of stuttering. However, haloperidol in particular often result in poor long-term compliance due to concerning side effects such as movement disorders and prolactin elevation, which can also occur with risperidone. Other dopamine active medications reported to positively treat stuttering include aripiprazole, asenapine, lurasidone, which tend to be better tolerated than olanzapine with less weight gain. All these medications as well as olanzapine can carry the potential risk of a long-term movement disorder known as tardive dyskinesia.