Tetracycline was a medicine. In the 21st century, after discovering an outbreak of bubonic plague in a hospital caused by a temporally displaced plague victim from the 14th century, Owen Harper instructed a doctor to use "thirty milligrams of streptomycin and chloramphenicol plus two of tetracycline" to treat the infected. (TV: End of Days)

Community content is available under CC-BY-SA unless otherwise noted.