Clinical Pharmacokinetics

, Volume 2, Issue 1, pp 61–70 | Cite as

Pharmacokinetic Interactions with Rifampicin

  • W. Zilly
  • D. D. Breimer
  • E. Richter
Article

Summary

Rifampicin, a potent antituberculosis agent, is frequently combined with other antituberculosis drugs, or with drugs belonging to entirely different classes which may be required during a long period of antituberculous treatment, and therefore has a potential for drug interactions of practical clinical importance.

The absorption of rifampicin is markedly decreased when it is simultaneously administered with para-aminosalicylic acid granules, due to adsorption by an excipient, bentonite. Several clinical observations and investigations have indicated that rifampicin itself accelerates the metabolism of various other compounds, including oral anticoagulants, the contraceptive pill, oral hypoglycaemic agents and digitoxin.

Rifampicin seems to be a potent inducer of drug metabolism in humans and it causes a proliferation of the smooth endoplasmatic reticulum and an increase of cytochrome P450 content in the liver. It also increases its own rate of desacetylation. However, of the lest compounds hexobarbitone and tolbutamide, the metabolic clearance increased 2- to 3-fold following rifampicin treatment, whereas antipyrine clearance was unaltered. This indicates that there is a certain selectivity in the enzyme induction effect of rifampicin, although it remains unclear which compound will and which will not be affected.

Rifampicin may also possibly interfere with hepatic uptake of other compounds, but the clinical significance of this type of interaction has not been clearly demonstrated. On the other hand, oral probenecid significantly increases the serum level of rifampicin, probably due to a similar depression of hepatic uptake.

Keywords

Rifampicin Tolbutamide Half Life Pharmacokinetic Interaction Phenobarbitone 

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Copyright information

© ADIS Press 1977

Authors and Affiliations

  • W. Zilly
    • 1
    • 2
  • D. D. Breimer
    • 1
    • 2
  • E. Richter
    • 1
    • 2
  1. 1.Department of Internal MedicineUniversity of WürzburgLeidenThe Netherlands
  2. 2.Department of Pharmacology, Subfaculty of PharmacyUniversity of LeidenLeidenThe Netherlands

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