A patient presents to the emergency department complaining of a severe headache. She is diaphoretic and is unable to sit still. Her family tells the nurse that the client has been taking "some herb." Which herb does the nurse suspect the client has been taking?

A. Ephedra: Ephedra is an herb that contains ephedrine, a stimulant known to cause symptoms such as severe headache, diaphoresis, and restlessness. Ephedrine has been associated with cardiovascular side effects, leading to its restriction or banning in many countries. B. Feverfew: Feverfew is an herb commonly used for migraine prevention. It is not typically associated with severe headache, diaphoresis, or restlessness. Instead, it is known for its potential benefits in reducing the frequency and severity of migraines. C. Garlic: Garlic is an herb often used for various health purposes, including cardiovascular health. It is not known to cause severe headache, diaphoresis, or restlessness. D. St. John's Wort: St. John's Wort is an herb commonly used for mood-related conditions, such as mild to moderate depression. It is not associated with the symptoms described, and its primary effects are related to mood regulation.