i posted this as a resource in case one is taking other drugs besides sinemet.
there are many potentially detrimental drug interactions with grapefruit and other citrus.

just a good source on the exact affect of grapefruit on cellular metabolism. the good and bad.

video was interesting, describes how the grapefruit affect was discovered by serendipity, they has to find something strong tasting enough to mask the taste of alcohol in a research project.