"i began taking pristiq 50 mg approximately 6 months ago and as reported by the numerous previous posts, i also experienced exceptionally rapid weight loss.  the first week i suffered from nausea, to the point that i did not think i could suffer through it; but my physician said i should continue taking it.  i also experienced extreme dizziness, but only for the first few days.  i have to admit those symptoms do not outweigh the benefits.  like many others, i am much more clear headed and focused. i have noticed those negative side effects will return almost overnight if i miss a dose, so my body helps to remind me. i do not want to forget."