Kinetic study of serum penicillin concentrations after single doses of benzathine and benethamine penicillins in young and old people.

Abstract

In a comparative kinetic study of the serum concentrations of two penicillin complexes--medium-long-acting (benethamine penicillin) and long-acting (benzathine bipenicillin)--after a single injection in young adults and elderly people, the following results were confirmed statistically: (a) age was a major factor in the variations in serum penicillin concentrations and in their persistence in the serum; (b) the penicillin was absorbed faster in young than in elderly subjects even when a long-acting complex was used; (c) serum concentrations below the level regarded as lethal for treponemes appeared much earlier and more frequently in young than in old people; and (d) the bioequivalence between penicillin preparations could not be estimated solely for the number of units of the agent used but from the bioavailability of the chosen formulation. Thus a uniform and standard penicillin dosage allowing no safety margin may help in the superficial healing of a syphilitic chancre or the resolution of a roseola but it will certainly be insufficient to kill Treponema pallidum. It seems essential therefore to provide an antibiotic cover at high dosage over a long period of time.

• Authors: P Collart, M Poitevin, A Milovanovic, A Herlin, J Durel
• Journal: The British journal of venereal diseases (Br J Vener Dis) Vol. 56 Issue 6 Pg. 355-62 (Dec 1980) ISSN: 0007-134X [Print] England
• PMID: 7448577 (Publication Type: Comparative Study, Journal Article)

Chemical References

• Penicillins
• benethamine penicillin
• Penicillin G
• Penicillin G Benzathine

Topics

• Adult
• Age Factors
• Aged
• Biological Availability
• Drug Administration Schedule
• Female
• Humans
• Kinetics
• Male
• Middle Aged
• Penicillin G (administration & dosage, analogs & derivatives)
• Penicillin G Benzathine (administration & dosage)
• Penicillins (blood)
• Syphilis (drug therapy)