available over the counter: no

uses: treatment of tension headaches and migraines

mechanism of action: butalbital is a barbiturate which effects the central nervous system to cause sedation; aspirin interferes with prostaglandins (which cause inflammation); caffeine potentiates the effectiveness of pain relievers; codeine is a narcotic which blocks pain

side effects
* commom: dizziness, drowsiness, sore throat, fever
* less common: nightmares, insomnia, constipation
* serious: chest tightness, difficulty breathing, coughing, sore throat

concerns: butalbitral is a barbiturate, and may cause physical dependence; kidney damage may occur with prolonged use; do not drive or use heavy machinery;  do not take medication if it has a strong vinegary odor