This is a tough one. 3-5% of people gain weight, but 4-6% get anorexia. Viibryd, valazodone, is not considered to cause weight gain.
There is anecdotal evidence that some people gain weight. In most people major depression causes a loss of appetite. Getting back your mo-jo also means getting back your appetite. I suspect, but have not done the extensive research yet, that this rebound effect is causing the weight gain.
Could I be wrong, yes; however, many people have reported that their doctors have said there should be no weight gain. The four studies I looked at showed no weight gain (n = ~4,000, but, as with all drugs, your milage may vary.
I hope this helps a little.
- Vilazodone Information for Consumers
- Vilazodone Information for Healthcare Professionals (includes dosage details)
- Side Effects of Vilazodone (detailed)
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