Broxil is NOT feneticillin
Broxil is a brand name for amoxicillin, not feneticillin (also known as penicillin G). These are distinct penicillin antibiotics with different chemical structures, pharmacokinetic properties, and clinical applications.
Key Differences Between Amoxicillin and Penicillin G
Chemical and Pharmacological Distinctions
- Amoxicillin is a semi-synthetic aminopenicillin derivative that is acid-stable and well-absorbed orally, making it suitable for oral administration 1
- Penicillin G (feneticillin) is the original natural penicillin that is acid-labile and poorly absorbed orally, requiring parenteral (intramuscular or intravenous) administration for reliable therapeutic levels 2
Clinical Positioning
According to American Heart Association guidelines, both penicillin V (the oral form of penicillin) and amoxicillin are listed as separate first-line oral antibiotics of choice for streptococcal pharyngitis 1. The guidelines explicitly state: "Penicillin V is preferred to penicillin G because it is more resistant to gastric acid" 1.
Practical Advantages of Amoxicillin
The guidelines note that amoxicillin offers several advantages over penicillin V:
- Better palatability: Amoxicillin suspension tastes considerably better than penicillin V suspension, improving adherence especially in children 1
- Once-daily dosing option: FDA-approved extended-release formulations allow once-daily dosing (50 mg/kg, maximum 1000 mg) for 10 days, which enhances adherence 1
- Comparable efficacy: Research demonstrates amoxicillin may actually be superior to penicillin for bacteriologic and clinical cure in streptococcal infections 3
When Penicillin G (Feneticillin) is Used
Intramuscular benzathine penicillin G remains important for:
- Patients unlikely to complete oral therapy
- Those with personal/family history of rheumatic fever
- High-risk populations (crowded living conditions, low socioeconomic status) 1
Common Pitfall to Avoid
Do not confuse brand names with generic drug names. Always verify the actual active pharmaceutical ingredient when prescribing or dispensing medications. Broxil contains amoxicillin, which while related to penicillin G, has distinct properties that make it more suitable for oral therapy in most outpatient settings.