Hello and Welcome to ‘Ask A Doctor’ service. I have reviewed your query and here is my advice. Invega is a safe drug and can be given without worries. To prevent the side effects concomitant use of Trihexiphenidyl is advised which will prevent the side effects. The drug is safe so please don t get worried. Other similar options are shots of long acting Haloperidol or Risperidone. You can talk with his doctor for that. CBD use in bipolar is under research only and not proven. Hope I have answered your query. Let me know if I can assist you further.