To my knowledge, there are only three. I'm on Anastrozole and the side effects so far are tolerable. The different drugs affect each person differently. All you can do is try them and see which ones you can tolerate.

Hello!
The Aromatase Inhibitors (for Post-menopausal)-
Three drugs:
Anastrozole (Arimidex),
Letrozole (Femera),
Exemestane (Aromasin)

Also, there is a Selective Estrogen Receptor Modulator (SERM) -Tamoxifen (for those who are pre-menopausal.

Each of us responds differently to these drugs, so IF you have side effects from one of the drugs and you change to a different one, you may not have side effects. There are ways to stop the side effects! Ask on MyBCTeam to get ideas from those of us who have found what works!

I also take the Bonafide Relizen. That one does help.

Third choice is exemestane. I went from Letrozole to exemestane due to side effects from the first one.

I decided to go back in the letrozole since the other two were worse. I am not tolerating them at all....I haven't taken letrozole for 2 weeks since recovering from pneumonia and effects from the string antibiotics... I do not take any supplements at this time. Got my herceptin hylecta shot yesterday and again today I have to convince my legs to move. So far no reason other that this treatment causing that.
Prayers and hugs to all you beautiful ladies!