*Prices reflect U.S. average retail price

Istradefylline, sold under the brand name Nourianz, is a medication used as an add-on treatment to levodopa/carbidopa in adults with Parkinson's disease (PD) experiencing "off" episodes. Istradefylline reduces "off" periods resulting from long-term treatment with the antiparkinson drug levodopa. An "off" episode is a time when a patient's medications are not working well, causing an increase in PD symptoms, such as tremor and difficulty walking... Wikipedia

 

 

Manufacturer's Website: Nourianz                                                                                                                            Average retail cost: *

 

* This drug is only available at select specialty pharmacies, which usually means it may be expensive.