Question

In its earliest medical application, the herb from which amphetamines are derived was used as a treatment for __________

Answer 1

Hello!
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The answer to your question is "asthma".
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In its earliest medical application, the herb from which amphetamines are derived was used as a treatment for asthma.
:)

Answer 2

the herb known as ephedra, was used in treatment of asthma and common cold