Many drugs have an unknown effect under hyperbaric pressure and cannot be guaranteed not to aggravate nitrogen narcosis. Note - this list is not exhaustive. It is not my intention to advise here on any specific person's fitness to dive, but rather to provide an overview. You must be advised by the doctor you consult on your own fitness to dive. If you have any personal doubts about your fitness or a query about an aspect of your organisation's fitness to dive requirements please consult a doctor.
Nothing here is intended to inform divers outside the United Kingdom.
My times and availability for medicals for divers. A few notes on the commonest reasons for failing a medical. Why divers Die Medical problems contributing to incidents.