How effective is butterbur in treating migraines?

Butterbur (Petasites hybridus) is a perennial shrub. Its root extract reduces inflammation and is used to treat asthma and migraine. Butterbur is the most effective nutritional remedy for migraines.

Doses of 50-75 mg twice daily have been shown to reduce headaches by up to one-half after about 3 months. Children may use 25 mg twice daily. Most people complain of few side effects when taking butterbur, although about one in four will experience digestive system complaints, most commonly burping.

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