Medication Summary
Specific therapy for idiopathic intracranial hypertension (IIH) is aimed at lowering intracranial pressure (ICP) pharmacologically. Carbonic anhydrase inhibitors and other diuretics are thought to have their effect on ICP by reducing cerebral spinal fluid (CSF) production at the choroid plexus. Cardiac glycosides have a similar effect. Corticosteroids are effective in reducing ICP. However, the mechanism of action is unknown. Corticosteroids are often used as maximum medical management when rapid lowering of ICP is required.
Carbonic anhydrase inhibitors
Class Summary
These agents reduce CSF production and lower ICP.
Acetazolamide (Diamox)
Reduces CSF production by about 50% (Maren, 1972; McCarthy and Reed, 1974) and lowers ICP. Commonly achieves long-lasting control of transient visual obscurations (TVO), headache, and diplopia, all of which are manifestations of intracranial hypertension, even though papilledema does not resolve completely. Effect on ICP has been shown to be unsustained (Plum and Siesio, 1975), and many patients develop adverse effects severe enough to hinder compliance.
Some clinicians prefer Sequels formulation of Diamox, which may be better tolerated than standard version.
Few patients tolerate more than 2 g/d, but 4 g/d may be required to produce measurable pressure-lowering effect (Gucer and Viernstein, 1978); treatment usually initiated at 1 g/d and increased to 2 g/d if symptoms are not controlled and adverse effects are not severe; treatment with Diamox alone not appropriate for patients who are experiencing progressive visual field loss.
Cardiac glycosides
Class Summary
These agents reduce CSF production at choroid plexus and reduce ICP.
Digoxin (Lanoxin)
Present in high concentration in choroid plexuses of patients taking standard cardiac doses (Bertler, 1973), has been shown to reduce CSF production by as much as 78% in humans (Neblett, 1972), probably by inhibiting Na-K-ATPase pump (Vates, 1963). Only one report in which a patient with IIH was treated with digoxin, but patient was asymptomatic, so not known whether symptoms would have been controlled (Schott and Holt, 1974).
Glucocorticoids
Class Summary
These agents reduce ICP through an unknown mechanism.
Prednisone (Sterapred)
Mechanism of action by which corticosteroids lower CSF pressure unknown. Some believe that may facilitate outflow at arachnoid granulations.
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