that have to do with the brain, why are pharmaceuticals efficient in helping and correcting mental disorders?

Are the pills not chemicals as the companies state and are instead little capsules filled with spiritual energy, and that is why they help to correct mental imbalances since mentality is spiritual?
(to help clarify)

are the pharmaceutical companies lying when they say the pills are made with chemicals, meaning, the pills really are spiritual things crammed into the capsules (like little angels and demons) to help the person taking the pill correct their soul?