Weight loss and meds/need help | ADHD Information

Many people with ADD use Ensure or Carnation Instant Breakfast to help control the weight loss with the medications.  I use these with my 9 year old daughter-she's naturally skinny and really can't afford the weight loss from the Adderall.  I've always had the opposite problem, so I'm really enjoying this side effect myself.  I just try to make sure eat nutritious types of food when I do eat.  There were also some really good recipes for high-calorie smoothies on some threads on this website about 2 months ago.My husband has ADD and is on his third medicine, Adderall.  Welbutrin and Ritalin didn't seem to be strong enough and caused unpleasant side effects. Adderall seems to be working fairly well so far. Here's the problem---My husband is naturally way too skinny, and on all of these meds, he can't seem to put on weight! Does anyone know if there are any ADD meds that do NOT cause weight loss? Also, does anyone have tips for weight gain? Having a hubby with a 28 inch waist when I'm 29 weeks pregnant and fat is ZERO fun!  Thanks in advance for any tips!