Fioricet 40mg online is a prescription drug prescribed to people who suffer from tension-type headaches and migraines. It is a combination of three main ingredients: butalbital, paracetamol, and caffeine. Butalbital, being a barbiturate, is a component of a drug that can cause a phyoliset high. Barbiturates, like drugs such as opioids and other muscle relaxants, act as central nervous system depressants.