How to wean off of Pristiq

Patient: Hello! My 19 year old daughter has been on Pristiq for about 1.5 yrs. for depression. She’s been experiencing health difficulties that her doctors feel may be a side effect of her being on Pristiq. Her doctor has decided to remove her from Pristiq, and said she needs to wean off of it, but how does one do that? Her doctor said that, went on to another topic and then left before giving us the necessary weaning details. We’ve tried to contact the doctor to ask her exactly how to do that, but we need to make an appointment WEEKS from now in order to talk with her! Thank you!