Yes, it is okay (and recommended) to take CBD oil with those medications. However, taking extremely high doses of CBD and/or THC may lead to higher serum levels of your medications. If you are taking less than 200 milligrams of CBD and THC/day, there is no cause for concern.
(below is more information regarding cannabis and Parkinson’s disease)
I hope this helps!
Results from several preclinical studies suggest that modulating the endocannabinoid system may be useful in treating some motor symptoms of Parkinson’s disease. Unfortunately though, results from clinical studies have been inconclusive and conflicting.
However, "an open-label observational study assessing the clinical effect of cannabis on motor and non-motor symptoms of PD revealed significant improvement after treatment in tremor and bradykinesia."
Also, typical neuropathological features of Parkinson’s include degeneration of dopaminergic neurons—several studies suggest that cannabis has antioxidant, anti-inflammatory and other properties that could slow the degeneration, which may explain some of the positive results some studies have shown.
And though the research regarding cannabis and motor symptoms of PD has been conflicting, cannabis has been shown to mitigate many of the non-motor symptoms which accompany Parkinson’s, such as insomnia, pain, anxiety and depression.
Altogether, for most, I consider cannabis as a valuable adjunctive medicine for the treatment of Parkinson’s, which should help improve the quality of life for most patients afflicted with Parkinson’s disease, and may even slow the progression of the disease.