Can risperdale and abilify (aripiprazole) cause you to have an irregular period?

Yes: Antipsychotics often have some effects on menses, and sometimes those effects are pretty significant. One reason for this is the effect that antipsychotics can have on the hormone prolactin.

Risperdal can: Risperdal can cause menstrual problems as it increases a hormone secreted by pineal gland in the brain called prolactin. But Abilify (aripiprazole) rarely does that hence should not cause any menstrual issues, however there are anecdotal reports.