He may hesitant to put you on a med that caused a manic episode before but it definitely wouldn't hurt to ask. An example would be myself, I'm on Invega Sustenna, Zoloft, Klonopin, and Trazodone. Before I was on all these they just put me on 150 mg of Zoloft and I had a horrible manic episode, now that I'm on the other stuff I felt like I needed a little boost from my depression so I asked to be on a small dose of Zoloft, I'm now on 50 mg, the low dosage and the other meds make a great combination without tipping me into mania. Sorry, I have no experience with Topomax, just wanted to share what happened when I got on a smaller dose of a med that originally made me manic.