What is letrozole?

ilovelee143 • Well, hey. I`m 29 and TTC my second child. I have a son named Joshua whom is 9 and a very loving boyfriend named Brent. oh, and I cannot forget my fur baby Koby.
I am currently on clomid but I talked to another doctor who will possibly try letrozole. Can someone please let me know what it is and what I should expect? Symptoms? Do I have to get blood work done? Any info would be great!