To switch from risperdal .025 mg to abilify (aripiprazole) 2mg can i stop ferst day of risperdal and replace it with abilify (aripiprazole)?

Treatment: if Risperidone was not efficacious (not working) there is little to loose with an abrupt discontinuation If Risperidone was efficacious (was working) but is being discontinued for other reasons then there is a potential for loss of benefit if it is discontinued prior to Aripiprazole providing benefit. there is no established discontinuation syndrome for risperidone.

YES: You shouldn't have any withdrawal symptoms from that dosage of Risperdal

Different ways: have been tried. There is no single right way to switch from one medication to another. The important thing to do is to talk to your psychiatrist. Did he/she ask you to do it in a particular way? If you received specific instructions, then you should follow it. If not, then go ahead and switch over like you described.