I am not a doctor, so make of this what you will.
You report that you don't notice any effects from the drugs you take, even when you miss a dose. Since the point of these drugs is to reduce symptoms, it raises questions as to whether you should be taking them.
Has your doctor explained to you what is going on?
Possible reasons for what you describe include:
- the drug doses are sub-therapeutic. What are the doses?
- there is a variation of symptoms with time, but you don't notice it. (I wrote a program to measure the speed of my hand movements, see www.parkinsonsmeasurement.org/toolBox/sideToSideTap.htm , it counts the number of times you type q followed by p in 30 seconds. It does it for both the left and right hand.)
- you have never missed enough doses to "run short". The effectiveness of each dose wears off in a few hours, depending on what version you're on. Are you on the controlled release version?
- you don't have any Parkinson's symptoms. Would you pass as healthy?
Unfortunately, even if you find that you don't need the drugs, you can't just stop taking them. You will need to see your doctor to arrange a tapper down schedule.