Numerous studies, scientific ones, indicate that intercessory prayer improves the healing of a patient. It does not matter where you are physically in relation to the patient, in the room or in a different country. It is all part of the scientific "Quantum" world of interconnection. So if you are praying for someone, don't mind if others call you a simpleton. Science is scratching it s head over this phenomenon. What the contemplative world says is that God is everywhere, so we are all interconnected anyway. Your prayer might send vital, positive energy toward someone.
It helps if the person you are praying for wants to get well. Some just want their opioid fix, or prefer to wallow in self-pity. But pray anyway. Who knows.