Just the Celexa and Abilify. At first I thought it was the Abilify which was causing it because it hit me hard at first, but then I talked with a woman who was also on Celexa in the past and it made her very lethargic/tired, so I'm not really sure which caused it. Of course, it could have been both. For all I know the Celexa was making me lethargic and the Abilify added to it with a weight gain side effect.