Medicines for Idiopathic intracranial hypertension (IIH)

What it is

Idiopathic intracranial hypertension (IIH) is a condition in which the pressure of the fluid around the brain (cerebrospinal fluid) is raised without an obvious cause such as a tumour or blood clot. It most often affects younger women, and is strongly associated with being overweight and with weight gain. The raised pressure causes symptoms including headaches (often daily and worse in the morning or when lying down or straining), visual disturbances (such as brief episodes of greying or loss of vision, double vision, or blurring), and pulsating noises in the ears (a "whooshing" in time with the heartbeat). Importantly, the raised pressure can affect the optic nerves at the back of the eyes (causing swelling called papilloedema), which, if not treated, can lead to permanent damage to vision — which is why protecting sight is a central concern. It is diagnosed by examining the eyes, brain scans (to exclude other causes), and measuring the fluid pressure.

How it is treated

Treatment aims to reduce the pressure, relieve symptoms, and — crucially — protect vision, which is monitored closely with regular eye checks. For people who are overweight, weight loss is a key and effective part of treatment and can significantly improve or resolve the condition. Medicines that reduce the production of cerebrospinal fluid are commonly used to lower the pressure. Headaches are managed, being careful to avoid medication-overuse headache. Where vision is threatened or the condition does not respond to other measures, procedures or surgery to relieve the pressure and protect the optic nerves may be needed. Any contributing factor (such as certain medicines) is reviewed. Because sight is at risk, ongoing monitoring by eye and neurology specialists is important. The reassuring message is that, with treatment, most people's symptoms improve and vision is protected, and weight loss can be particularly effective.