I am a Parkinson's patient and started Pristiq 50mg a year ago for extreme anxiety. I no longer suffer from anxiety and 3 weeks ago decreased my Pristiq to 25mg with my doctors approval. I feel I still do not have any anxiety or depression but since the decrease I have been having extreme weakness, and increased tremors and sometimes it feels like my Sinemet is not working or is partially working. Am I experiencing withdrawal symptoms from reducing the Pristiq and if so how long will it take before i can get off this drug completely.