I'm currently taking risperdone, Artane, Lexapro, (escitalopram) and Lamictal. Is it safe to use passion flower with those for insomnia?

Talk to your doctor . In general, I recommend patients to not combine their psychiatric medications with herbals. Based upon my review of Passion flower, increased drowsiness is the main risk. Some herbals increase the risk of Serotonin syndrome when combined with psych meds. I did not see any reports of this with Passion flower. Talk to your doctor before combining your meds with any herbal preparations. Best wishes!
Passion flower. I am not aware of any contraindications with other medications. Avoid high doses due to sedation effect. Let your doctor know.