The Discovery of Penicillin The First True Antibiotic

In 1928, a mundane incident in a laboratory led to one of the most groundbreaking discoveries in medical history which was penicillin. The world first true antibiotic. By true I am referring to its functionality where a small dosage is exposed to the body forces the body to build immunity to the disease improving our immune system to fight against it. This discovery revolutionized the treatment of bacterial infections and thus helping create new antibotics for our future.


Alexander Fleming was a Scottish bacteriologist who conducted research at St. Marys Hospital in London. He studeied the bacterium Staphylococcus aureus, which can cause serious infections. Fleming noticed that one of his petri dishes had been contaminated with mold. The area around the mold was free of the Staphylococcus bacteria.

Fleming discovered that the mold was a type of Penicillium notatum. He thought the mold was releasing something that killed bacteria. After doing more experiments, Fleming found out that this substance, which he called penicillin, was dangerous with its ability to kill many harmful bacteria without hurting human cells.  However, before penicillin was discovered, infections like pneumonia, sepsis, and wounds could be deadly. But, with the introduction of penicillin as treatments in hospitals during the early 1940s, it greatly lowered the death rates from these infections.

Penicillin's success opened the door for creating other antibiotics, starting a time when many infections that couldn't be cured before could now be treated effectively.

However, making penicillin in large amounts was proved to be difficulty. It wasn’t until World War II that scientists like Howard Florey and Ernst Boris Chain figured out how to mass-produce penicillin. Making it available for treating injured soldiers and civilians.


Today, penicillin and its related drugs are still very important in fighting bacterial infections. However, antibiotic resistance is a big problem that makes these drugs less effective. This shows that discovering penicillin was a major achievement in medicine, but it also reminds us that we need new antibiotics and to use the ones we have responsibly.

Also, the discovery of penicillin shows how important observation, luck, and scientific research can be. Finally, as we deal with new challenges in treating infections, the legacy of penicillin keeps inspiring new ideas in pharmaceutical science.