What medicine was found to be both harmful and beneficial to europeans due to its against malaria?

A medicine found to be both harmful and beneficial to Europeans due to its help against malaria was (opium). Opium comes from the poppy plant. It is beneficial for many of the same reasons that is harmful. Often,  for medicinal treatment, Europeans laced the opium with beer. It is an antidepressant that can be quite addictive in large doses.

idk

explanation:

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