Gained 20 pounds on Lexapro in 3 months in spite of diet/exercise...dr says Cymbalta (duloxetine) more weight neutral is this accurate?

Agree. Literature supports Cymbalta (duloxetine) as less likely to cause weight gain. That said, everyone responds somewhat differently. Weight gain from Lexapro is typically gradual and reversible. Keep exercising and eating healthy foods. Hope you do well on Cymbalta (duloxetine).