When you order Fioricet online 180 tabs, you will find its composition saying that each tablet combines three different medicines, acetaminophen, butalbital, and caffeine. It is an analgesic that relieves you from thrusting pain. Butalbital is a barbiturate that promotes relaxation by reducing your anxiety. Caffeine accelerates the function of acetaminophen even more. It takes 30-60 minutes for the medicine to start working to relieve you from pain.When you order Fioricet online 180 tabs, you will find its composition saying that each tablet combines three different medicines, acetaminophen, butalbital, and caffeine. It is an analgesic that relieves you from thrusting pain. Butalbital is a barbiturate that promotes relaxation by reducing your anxiety. Caffeine accelerates the function of acetaminophen even more. It takes 30-60 minutes for the medicine to start working to relieve you from pain.