<unk>  is a combination that is FDA approved for the treatment of for the relief of the symptom complex of tension (or muscle contraction) headache.   Common adverse reactions include lightheadedness and gastrointestinal disturbances including nausea, vomiting, and flatulence, toxic epidermal necrolysis and erythema multiforme.
Butalbital
Ephedrine
N-Methylephedrine
Aprobarbital
Bentoquatam
Theobromine
Butabarbital
Proxibarbital