Hi,
All aromatase inhibitors may cause
side effects, but some people can better tolerate the
side effects of these drugs,while others cannot.Check with your Doctor/Oncologist if another similar drug might be better suited for you if any of these most common side effects persist or become bothersome when using Letrozole (Brand name Femara).
Please check the link below for more information concerning the side effects.
http://www.drugs.com/sfx/letrozole-side-effects.