There is a free three week course available for anyone whom wants to learn about our condition I took this course and it is very informative I scored 84%.
Run by Future Learn called GOOD BRAIN BAD BRAIN PARKINSONS.
we all will generally react different to our meds as PD is such a complex condition.
Personally I would not accept a cheaper version of my main PD med our on DNA is why we all react different I was dx just 3 years ago and my PD is quite aggressive to the point I currently have to take 39 tablets per day and injections some progress slow some fast and the problem with delaying medication is where you do then start them as your condition had progressed a bit the drugs then have to work much harder.
best wishes all BB