Unfortunately, the drug has only been tested in mice - still much testing is needed before the FDA approves any drug for humans. The company, Inflazome, has shown some progress with mice, and that's probably what you heard about. But they still have not tested it in humans to see if 1) it's safe and 2) If it works in humans, The phase 1 trial will take place early in 2019; if it's safe, they'll move on to phase 2 clinical trial with a larger number of patients. If you want to know the science behind this, as well as other companies working on similar drugs, see the Science of Parkinson's blog: https://scienceofparkinsons.com/2018/11/22/nlrp3/ I couldn't find any info about the clinical trial yet.
I susect that you will need a prescription from a doctor.
thanks for the info