@lauracaballero, welcome. Desvenlafaxine (Pristiq) is a serotonin-norepinephrine reuptake inhibitor (SNRI). I'm tagging fellow members like @chicago1211 @jordanstutz1 @ottawalisa @irishgirl55 @jimhd who may be able to share their experiences about taking an SNRI, for how long and more.

Laura, needing medication for extended periods of time or life long to manage depression depends on many factors and varies from person to person. These factors can include family history, environmental factors, other long-term medical or mental health, changes in other stressors like relationships, work, sleep patterns. Here's an article that explains more:
- How Long Should You Take Antidepressants? https://www.webmd.com/depression/features/antidepressants

Laura, did you find that 3 weeks was too fast to taper of the medication? Are you also supporting your management of depression with non-medicinal therapies, like cognitive behavior therapy (CBT), transcranial magnetic stimulation (TMS), yoga, exercise, talk therapy or something else?