Parkinson's disease
MAO-B inhibitors

MAO-B inhibitors (safinamide, selegiline and rasagiline) increase the amount of dopamine in the basal ganglia by inhibiting the activity of monoamine oxidase B, an enzyme that breaks down dopamine. They have been found to help alleviate motor symptoms when used as monotherapy (on their own); when used in conjunction with levodopa, time spent in the off phase is reduced. Selegiline has been shown to delay the need for beginning levodopa, suggesting that it might be neuroprotective and slow the progression of the disease. An initial study indicated that selegiline in combination with levodopa increased the risk of death, but this has been refuted.

Common side effects are nausea, dizziness, insomnia, sleepiness, and (in selegiline and rasagiline) orthostatic hypotension. MAO-Bs are known to increase serotonin and cause a potentially dangerous condition known as serotonin syndrome.
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