Where can I find a list of medicines for transition anxiety that have
been used in conjunction with typical ADHD meds?

ADD and ADHD almost never occurs by itself.  My son has control of
implusivity and hyperactivity with (wonderful!) Concerta, the long
acting Ritalin.  We found that a slight amount of (also wonderful!)
Paxil (10 mg) eased some his transition anixety.  12.5 mg or 15 mg
would clear it all up, but end up erasing the
impulsivity/hyperactivity control after a few weeks.  He is working so
hard bahaviorally, but we wind up with an either/or situation.

We're Very clear that ADHD meds are extremely idiosyncratic, and must
be monitored closely by his psychiatrist.  What works in one case can
often
utterly fail in another case.  We just want a list for starting point.