I was prescribed 20mg of Vyvanase to start to counteract the weight gain of Lexapro (30 lbs in 3 months) My concern is the CNS effects of this medicine. The Lexapro is working great other than the weight gain. Any advice would be appreciated. I would have felt more comfortable with a much lower starting dose. Is there a way to take less than 20mg being that it comes in capsule form? Thanks in advance to all. A little general info (34 male) Slight depression disorder. 10 mg Lexapro at night with 1mg Klonopin.