From the documentation on clincialtrails.gov, I think we can infer that the randomization was 1:1.
So far, so good.
I would argue that assessing blame for the seizure is irrelevant to investors because the regimen being pursued in this program is the combination. Knowing which drug caused the seizure might be helpful to TRGT in determining the doses to take into phase-3, but it will be of no help to investors to hear that Celexa is responsible for the seizure.