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Increased sensitivity to phenprocoumon during methyltestosterone therapy

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Summary

Abnormal sensitivity to phenprocoumon in a castrated male who was receiving substitution therapy with methyltestosterone, has been studied and compared with pharmacokinetic data obtained from six control subjects, all of whom had cardiac disorders. The concentration-effect relationship for phenprocoumon in the castrated patient was evaluated by the mathematical model described by Nagashima et al. (1969). The possible mechanisms involved in sensitization by methyltestosterone of the response to phenprocoumon are discussed. It is suggested that methyltestosterone increases the affinity of the receptor sites in the liver for phenprocoumon, an effect which has previously been attributed to other C17-alkyl-substituted androgens.

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Husted, S., Andreasen, F. & Foged, L. Increased sensitivity to phenprocoumon during methyltestosterone therapy. Eur J Clin Pharmacol 10, 209–216 (1976). https://doi.org/10.1007/BF00558331

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Key words

  • Phenprocoumon
  • anticoagulants
  • concentration-effect curves
  • methyltestosterone
  • interaction