Should one make up for missed fasting and prayers due to severe depression and schizophrenia?

Mental illness does not justify abandoning prayer and fasting, as long as one's intellect remains intact; rather, adherence to acts of worship is a means to healing. Whoever abandons prayer and fasting while possessing a sound mind has sinned and must repent and make up for what they missed. However, if the illness deprives them of their intellect, then making up the missed acts is not obligatory upon them.