How long do you have to wait after having brain surgery before riding a roller coaster?

Neurosurgery: The minimum recommendation is three months at least after surgery, depending on the extend of the surgery some neurosurgeons might request no roller coaster rides ever due to the gravitation stress on the brain.

Neurosurgery: This is a question that should be taken up with the neurosurgeon as the answer will be based on the severity of the injury and risk of injury due to a roller coaster ride.