Although interactions may be suggested when MAO-B inhibitors are combined with COMT-inhibitors, such adverse reactions have not been reported to be of relevance.
ncbi.nlm.nih.gov/pmc/articl...
I think this may be of interest for the users of azilect who may want to take quercetin.
Quercetin Found to Stimulate New Brain Cells
Azilect : does it slow progress? Is it neuro protective? 
rasagiline (Azilect) vs Xadago (safinamide) be. Ongentys (opicapone)
Help in understanding drugs in Parkinsons
5-HTP in patients not taking Sinemet can worsen symptoms of PD
