At any point in time, it usually was one type of SSRIs and a benzo, *plus* one extra drug (like Carbamazepine - an anticonvulsant, Mianserin, Tranxene, Aurorix, or Zolpidem.
The combination Paxil (Seroxat) and Xanax were used most on average - when you count in all of the "switching periods".