Just Sharing.
Stomach flu can be a relatively simple infection for a healthy person, which I am. But I have PD and I take Sinemet and Selegiline. Here is what happened: I got the effects of the bug and diarrhea started, muscle soreness and fatigue followed quickly thereafter. I had no appetite but kept eating a bit and I kept on my medication schedule. Then the PD symptoms got exacerbated, in my case mostly rigidity, muscle soreness and bradykinesia. The fatigue was crippling and soreness was very unpleasant. It was as if I had stopped Sinemet suddenly. I realized that Sinemet is absorbed in the intestine and my Dr stated it is not all parts of the intestine that allow this absorption to take place, so when the intestine goes in overdrive, expect Sinemet to be only partly absorbed (because it is moved fast) and expect PD to take that opportunity to come out with a vengeance. When I realized this, I took more Sinemet and it worked but I was also recovering from the infection at the same time. Next time my intestin goes in high gear, I will be ready to compensate by taking more Sinemet as needed. I thought that the virus was really bad, it wasn't; it was the compounding with PD.