Can arimidex (anastrozole) cause facial nerve numbness?

Probably not. Arimidex (anastrozole) is a drug that blocks the conversion of certain sex hormones to estrogen, which is useful to treat tumors that depend on estrogen to grow (such as certain estrogen-sensitive breast cancers). Nerve damage (neuropathy) is not a listed side effect, but occasional tingling feelings in the fingers can occur. Numbness in the face would be a problem with the 5th cranial nerve (not 7th, facial).