"i have suffered from severe depression/anxiety for 9 years now. i also suffer from ptsd. i have tried almost everything out there, and prozac is the only antidepressant that i can take and that works for me. i am very sensitive to medication, and i&#039;m glad i have found at least one medication that helps my severe depression. it helps motivate me and keeps me alive. i have been on 10 mg for a long time, and then recently went to 20 mg. i think i need to increase my dosage even more so. but it has been the only reliable medication i have ever taken, and for the longest duration."