medical
psychiatric - mental disabilities
A Certificate of Fitness to Fly is required for any passenger who is psychiatrically disturbed. If the passenger is, or may become aggressive or uncontrolled, they must not be accepted without Medical Clearance.
For further information see medical clearance and a MEDIF form is available here.
mentally handicapped Mentally handicapped passengers may be accepted if accompanied. They may be accepted for travel on bmi services as unaccompanied passengers only if they have flown before and do not require in flight medication.
In this case they must be treated as Unaccompanied Minors.
Also check if the patient is epileptic … if so please see the pages on epilepsy and fits.