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The 53 pages that link to Penicillin, each with the reason it gives.

• Nobel Prize in Physiology or MedicineBroader topic: Alexander Fleming shared the 1945 prize for its discovery and effects.

• AntibioticBroader topic: Penicillin became the first widely used antibiotic and helped launch modern antibacterial treatment.

• Antibiotic resistanceRelated: Its clinical use helped make antibiotic resistance a visible medical problem.

• Beta-lactam antibioticBroader topic: Penicillins are the foundational and widely used branch of the class.

• FungusRelated: Fungal compounds launched a major class of medicines against bacterial infections.

• Beta-lactamaseRelated: Penicillin use made bacterial enzymes that inactivate beta-lactams clinically consequential.

• Penicillin-binding proteinsBroader topic: Penicillin's antibacterial action comes from inhibiting susceptible wall-building proteins.

• Heterocyclic compoundRelated: Its fused heterocycles are central to antibacterial activity and chemical instability.

• FungiRelated: A fungal product transformed the treatment of bacterial infections.

• AmoxicillinNarrower topic: Amoxicillin is a semisynthetic member of this antibiotic family.

• Cell wallRelated: Penicillin weakens susceptible bacteria by disrupting construction of their peptidoglycan wall.

• MoldBroader topic: Penicillium mold led to the discovery and production of penicillin.

• Alexander FlemingBroader topic: Fleming identified its antibacterial effect after mould contaminated a staphylococcal culture in 1928.

• SyphilisRelated: Penicillin is the standard treatment for syphilis, including during pregnancy.

• Tuskegee Syphilis StudyRelated: After penicillin became standard treatment, officials still prevented participants from receiving it.

• Beta-lactam ringBroader topic: Penicillins are the classic fused-ring example of the structure.

• CephalosporinCompared with: Penicillins share cephalosporins’ target but differ in structure, spectrum, and allergy cross-reactivity.

• MycologyBroader topic: Fungal products transformed medicine through antibiotic discovery.

• SulfonamideCompared with: Its rise displaced sulfonamides as the preferred treatment for many bacterial infections.

• LysozymeCompared with: Fleming’s later antibiotic discovery targets wall construction, unlike lysozyme’s direct cleavage of wall polysaccharides.

• Natural productBroader topic: Penicillin shows how a microbial natural product became a foundational medicine.

• Streptococcal pharyngitisRelated: Penicillin is a standard treatment that shortens illness and reduces transmission and complications.

• Streptococcus pyogenesRelated: It remains a standard treatment for many uncomplicated infections caused by this organism.

• Howard FloreyBroader topic: It was the drug Florey’s team transformed from a laboratory substance into a treatment.

• Rheumatic feverRelated: Penicillin treats group A streptococcal infection and is commonly used to prevent recurrent attacks.

• CarbapenemCompared with: Carbapenems generally resist more β-lactamases than many penicillins.

• ErythromycinCompared with: Erythromycin can serve as an alternative when penicillin allergy rules out beta-lactams.

• Extended-spectrum beta-lactamaseRelated: Many ESBLs also hydrolyze penicillins, the antibiotic family named in their spectrum.

• Dorothy HodgkinRelated: Hodgkin’s 1945 X-ray analysis established penicillin’s complex molecular structure.

• TonsillitisBroader topic: It is a standard treatment for group A streptococcal throat infection.

• Scarlet feverRelated: It is a standard treatment that clears the bacterial infection and reduces transmission.

• SemisynthesisRelated: Penicillin development established a major early context for semisynthetic drug production.

• Antibiotic eraBroader topic: Penicillin’s clinical success launched widespread antibiotic treatment.

• Robert RobinsonRelated: Robinson contributed to wartime research on the structure and chemistry of penicillin.

• PenicilliumBroader topic: Penicillin was discovered through the antibacterial effects of a Penicillium mold.

• Bacterial cell structureBroader topic: It exploits a structural feature absent from human cells: the bacterial peptidoglycan wall.

• Clavulanic acidRelated: The search for ways to protect penicillins from bacterial enzymes motivated clavulanic acid’s development.

• FlucloxacillinNarrower topic: Flucloxacillin is a semisynthetic member of this antibiotic family.

• MethicillinNarrower topic: Methicillin was developed as a penicillin resistant to staphylococcal penicillinase.

• Organosulfur chemistryBroader topic: Its sulfur-containing core is part of a structure that inhibits bacterial cell-wall synthesis.

• Ernst ChainBroader topic: Chain and colleagues isolated and characterized this antibacterial substance for medical use.

• ErysipelasRelated: It is a standard treatment when erysipelas is caused by susceptible streptococci.

• Gerhard DomagkCompared with: Its later clinical success shifted treatment away from sulfonamides for many infections.

• Jarisch–Herxheimer reactionRelated: Penicillin treatment of syphilis is a frequent context for the reaction.

• 1940sRelated: Mass production transformed treatment of bacterial infections during and after the war.

• CloxacillinNarrower topic: Cloxacillin is a semisynthetic member of the penicillin family.

• FungicultureBroader topic: Industrial cultivation of Penicillium enabled large-scale production of this medicine.

• OxytetracyclineCompared with: Penicillins attack cell-wall construction, unlike oxytetracycline’s inhibition of protein synthesis.

• PhenoxymethylpenicillinNarrower topic: Penicillin V is a natural penicillin within this drug family.

• ArsphenamineCompared with: It eventually replaced arsphenamine as the preferred treatment.