I've read inspiring succes stories of treating Parkinson's with Ivermectin.
Here's an excerpt, from one that is behind a paywall ...

My Take (Dr William Makis) …
Parkinson's Disease patient who wanted to try Ivermectin, based on promising pre-clinical research.
This is 6 weeks in, on an escalating Ivermectin Protocol.
The response to Ivermectin and improvements in symptoms in such a short period of time have been truly remarkable.
This patient is able to play golf again. I was left speechless.
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God bless.
Thanks. I have a Neurologist that specializes in Parkinson and other movement disorders including another one I had no one but her could diagnose. One that hit me in 1994 called Functional Myoclonic Jerks {seizures}. It left me disabled at 37. She got it right my first visit when she diagnosed me with Parkinson. I told her it was Myoclonic Seizures and she said I was right. Actually I knew it from my own research but none of my doctors did LOL. I see her next month I think I’ll see if she’s heard about what you’re saying.