Aspirin

From Conservapedia

Aspirin originated as a herbal remedy, a bitter powder now called salicin which was extracted from the bark of the willow tree in ancient Greek times (however this raw form often induced extreme stomach pains as a side effect). [1] First synthesized as acetylsalicylic acid 110 years ago this drug is widely used to treat pain, fever, and inflammation.

Aspirin has a number of potential side effects, including ulceration of the stomach lining, easy bruising and bleeding, nausea, and allergic reaction. Overdose of aspirin can result in death. Aspirin use in children with some viral illnesses is linked to the development of Reye's syndrome.