Streptomycin
From Tardis Wiki, the free Doctor Who reference
Streptomycin was a medicine. After discovering an outbreak of bubonic plague in a hospital caused by a temporaly displaced plague victim from the 14th century, Owen Harper instructed a Doctor to use "30 milligrams of Streptomycin and Chloramphenicol plus two of Tetracycline" to treat the infected. (TW: End of Days)