A toothache sent me to the dentist recently. He found a tooth infection and prescribed the antiobiotic clindamycin, 300 milligrams three times daily — a large capsule I'd never taken before.
After two days I developed a localized, gnawing pain beneath my breastbone at mid-chest level. Swallowing food, especially hot liquids like coffee, exacerbated the pain, which was bad but tolerable. On
