Where can I find a list of FDA-approved eye drops for glaucoma?

I was using Lumigan, which my primary insurance covered, but my secondary would not cover the remainder, roughly an extra 40 dollars a month. I was then switched to Timolol. I do not like it as I have to use it twice a day and it burns. I also feel light headed and very tired. Is this normal? I do not take any other medications. I will follow up with my Dr. next week to check to see if the pressure is still being controlled. It was 32 and reduced to 23 with Lumigan. But due to cost and what my insurance would not cover, I had to switch.

Any feed back would be greatly appreciated.