Is it safe to take Fioricet if you are having anesthesia?

Is it safe to take Fioricet if you are having anesthesia?
A friend of mine sometimes takes up to 4 fioricets a day for her All kinds of Headache. She will be having a colonoscopy so she will be having anesthesia. She often wakes up with All kinds of Headache and needs to take a Fioricet. Is that okay with the anesthesia??

There are losts of good answers, but the best answer:

Answer by Thatoneguy
I dont know about that. Cause one of the actives in Fioricet is Butalbital and that is a barbiturate, so mixing that plus an anesthetic which could likely be another barbiturate, even if it isnt a barbiturate it will still be some type of downer which could lead to respiratory problems.

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