The study may suggest that other researchers should be less optimistic about the prospects for treating a range of other conditions with newer weight-loss drugs.

The FDA approved an apomorphine hydrochloride infusion device (Onapgo) to treat motor fluctuations in adults with advanced Parkinson's disease, Supernus Pharmaceuticals announced on Tuesday. The wearable device is the first subcutaneous apomorphine infusion device for Parkinson's and provides continuous treatment during the day, Supernus noted.

The GLP-1 drug, exenatide, has no positive impact on the movement, symptoms or brain imaging of people with Parkinson's, finds a new study led by UCL researchers.

Hopes that GLP-1 drugs such as Ozempic and Wegovy could help slow Parkinson's disease have taken an hit. A new study found that a drug in the same class called exenatide, marketed as Byetta, had no effect on slowing the disease or easing its symtoms.