Fiorinal and Fioricet are similar medications. However, the pain-killing medication included differs between the two.
While Fioricet contains acetaminophen, Fiorinal contains aspirin. Fiorinal is controlled substance because aspirin and acetaminophen are easily to be separated from butalbital. You can not buy Fiorinal online because it is controlled substance.
Both of these drugs are useful for managing pain and fever, but some people may respond better to one than the other.