Arsphenamine

Arsphenamine is an arsenic-based antimicrobial drug developed by Paul Ehrlich and Sahachiro Hata to treat syphilis. Marketed as Salvarsan, it was among the first effective drugs against the disease.

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Selective toxicity: Selective toxicity is a drug’s ability to harm a pathogen more than its host. Ehrlich sought an arsenic compound that attacked the syphilis bacterium while sparing human tissue.
Paul Ehrlich: Paul Ehrlich was a German physician and scientist whose work shaped immunology, hematology, and chemotherapy. He led the research program that produced arsphenamine.
Syphilis: Syphilis is a sexually transmitted infection caused by Treponema pallidum. Treating this disease was arsphenamine’s primary clinical purpose.
Magic bullet: A magic bullet is a drug imagined to target a disease-causing agent without harming the patient. Ehrlich used this metaphor for the selective action he sought in arsphenamine.
Treponema pallidum: Treponema pallidum is the spiral-shaped bacterium that causes syphilis. This was the pathogen arsphenamine was designed to eliminate.
Sahachiro Hata: Sahachiro Hata was a Japanese bacteriologist who helped identify arsphenamine’s activity against syphilis. His testing of Ehrlich’s compounds established the drug’s antisyphilitic effect.
Penicillin: Penicillin is a group of antibiotics that became the standard treatment for syphilis because of its effectiveness and safety. It eventually replaced arsphenamine as the preferred treatment.
Drug regulation: Drug regulation is the oversight of medicines’ testing, manufacture, labeling, and sale. Arsphenamine’s complex production and dangers underscored the need for reliable quality control.
Salvarsan: Salvarsan was the commercial name for arsphenamine, introduced in 1910 as a treatment for syphilis. This is the name under which the drug became widely known.
Salvarsan 606: Compound 606 was the arsphenamine preparation selected from a series of arsenical compounds tested by Ehrlich’s team. The number records its place in the program that led to the drug.