Answer: streptomycin

AnswerCrossword Clue
STREPTOMYCINNew "wonder drug" from fungi.
STREPTOMYCINOne of the "wonder" drugs.
streptomycinan antibiotic produced by the soil bacterium Streptomyces griseus, which was the first drug to be successful against tuberculosis but is now chiefly used with other drugs because of its toxic effects
streptomycinAn antibiotic that was the first drug to be successful against tuberculosis but is now chiefly used with other drugs because of its toxic side effects