ATC Code J01CE02
Formula C16H18N2O5S
Molar Mass (g·mol−1) 350,39
Physical State solid
Melting Point (°C) 120–128
PKS Value 2,73
CAS Number 87-08-1
PUB Number 6869
Drugbank ID DB00417
Solubility soluble in ethanol, chloroform and acetone, slightly soluble in water


Phenoxymethylpenicillin is a narrow-spectrum antibiotic, also commonly referred to as penicillin V. It is a phenoxymethyl analogue of penicillin G or benzylpenicillin. Phenoxymethylpenicillin is an orally active, naturally occurring penicillin used to treat mild to moderate infections of the respiratory tract, skin, and soft tissues caused by penicillin-susceptible microorganisms. Penicillin V is usually administered as a tablet or solution for parenteral use.



Phenoxymethylpenicillin acts against penicillin-sensitive microorganisms with bactericidal activity. It attacks bacteria during their active multiplication phase by interfering with bacterial cell wall peptidoglycan synthesis. Phenoxymethylpenicillin acts bacteriostatically by binding to specific penicillin-binding proteins (PBPs) located within the bacterial cell wall, which are critical for cell wall synthesis and maintenance, as well as cell division. This disrupts the third and final stage of bacterial cell wall synthesis. This subsequently leads to cell lysis and destruction of the pathogens.

Penicillin V is effective against the following organisms:

  • Staphylococci (except penicillinase-producing strains),
  • streptococci (groups A, C, G, H, L and M)
  • Pneumococci
  • Corynebacterium diphtheriae
  • Bacillus anthracis
  • Clostridia
  • Actinomyces bovis
  • Streptobacillus moniliformis
  • Listeria monocytogenes
  • Leptospira
  • Neisseria gonorrhoeae
  • Treponema pallidum


When administered orally, phenoxymethylpenicillin is rapidly but incompletely absorbed. The bioavailability of phenoxymethylpenicillin ranges from 25 to 60%. Approximately 50-80% of the given dose is bound to plasma proteins. About 35-70% of an oral dose is metabolized to penicilloic acid, an inactive metabolite. While the drug is rapidly excreted, only 25% of the total dose is detected in the urine. When administered orally, the half-life is approximately 30 minutes. In patients with renal insufficiency, it can last up to 4 hours.


Possible side effects:

  • Gastrointestinal symptoms
  • allergic skin reactions up to allergic shock,
  • skin and mucous membrane changes (especially in the mouth),
  • changes in blood count and anemia
  • fever
  • oedema
  • palpitations
  • bronchial spasms
  • Joint pain

Toxicological data

LD50 (rat, oral): >1040 mg/kg

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All information used for the content comes from verified sources (recognised institutions, experts, studies by renowned universities). We attach great importance to the qualification of the authors and the scientific background of the information. Thus, we ensure that our research is based on scientific findings.

Markus Falkenstätter

Markus Falkenstätter

Markus Falkenstätter is a writer on pharmaceutical topics in Medikamio's medical editorial team. He is in the last semester of his pharmacy studies at the University of Vienna and loves scientific work in the field of natural sciences.

Mag. pharm Stefanie Lehenauer

Mag. pharm Stefanie Lehenauer

Stefanie Lehenauer has been a freelance writer for Medikamio since 2020 and studied pharmacy at the University of Vienna. She works as a pharmacist in Vienna and her passion is herbal medicines and their effects.

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