It will take at least a week for the effects of the Invega shot. You'll get the first dose, which is a loading dose, and then a second dose at day 8, and then it will go to once a month. The pdoc should give you some oral meds to cover you for the first week. Oral invega or risperidone are good choices. The injection has a more stable blood level than oral meds, so once it gets to therapeutic it will have an over all better effect. I hope you find what works for you.