I had my surgery on March 19 (bypass). I have depression and ADHD. I used to take Concerta (XR Methylphenidate) 36 mg per day, and 75 mg Zoloft.
My Zoloft has stayed the same since this is not an extended release formula, and I have not noticed any change in my mood in the 3 weeks since surgery. My doctor changed my methylphenidate rx from Concerta to regular old, instant release Ritalin, 20 mg/day (one tablet with breakfast and one with lunch).
So far, this is working...OK. The dosage will probably need to be increased as I feel that it doesn't control my symptoms as well, but it's close I'd say. It also wears off sooner, but for me having my symptoms managed during the workday is the most important, so I'm OK with that.
My family doctor said she'd like to refer me to a psychiatrist to discuss how to manage the ADHD going forward. For now the Ritalin is a good stopgap.