I'm so glad your fishie is feeling better!
I'm with OFL, i don't use medications... they do more harm than good.
When I started with bettas I put mine on the same medication as you and he kept getting worst and worst.
Since, I only use salt or Aquari-Sol... the Aquari-Sol I use all the time with my water conditioner and (knock on wood) I haven't had any problems with deceases.
I've lost fish, yes but due to problems they came with that I couldn't help with in time. And I say it was the fish because they all came from the same breeder and most of them dies within the month.