Continuing the discussion from Medical Marijuana - general information:
Here is an interesting case report about medical marijuana (dronabinol) and IIH:
Science: Cannabis and THC effective in the treatment of idiopathic intracranial hypertension
Scientists of the New York State Psychiatric Institute in New York City presented a case report on a woman diagnosed with a longstanding history of idiopathic intracranial hypertension reported improvement of headaches, photosensitivity, transient blindness, enlarged blind spots, and tinnitus after smoking cannabis. All these symptoms and signs, including papilledema (swelling of the optic nerves where they enter the eyes), were associated with increased intracranial pressure. This means that the use of cannabis effectively decreased intracranial pressure. Treatment with THC at a dose of 10 mg twice a day, then reduced to 5 mg twice a day, was also effective.
Idiopathic intracranial hypertension is a neurological disorder characterized by high pressure in the fluid around the brain. It is also known as pseudotumor cerebri because there are some of the signs and symptoms of a brain tumour without a brain tumour being present. The space around the brain is filled with a water-like fluid, the cerebral-spinal fluid (CSF). If there is too much of CSF present the pressure on the brain rises. The cause of the disease is unknown. It is mainly found in overweight women of childbearing age and only rarely in thin men.
(Source: Raby WN, Modica PA, Wolintz RJ, Murtaugh K. Dronabinol reduces signs and symptoms of idiopathic intracranial hypertension: a case report. J Ocul Pharmacol Ther 2006;22(1):68-75)