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Hypotension induced by the concomitant use of a calcium-channel blocker and clarithromycin

Sayako Takeuchi1, Yuki Kotani1, Toshihide Tsujimoto1

  • 1Department of Critical Care Medicine, Japanese Red Cross Society Wakayama Medical Center, Wakayama, Japan.

BMJ Case Reports
|January 11, 2017
PubMed

Insights

Combining calcium-channel blockers with clarithromycin can lead to dangerous hypotension in elderly patients. This drug interaction, due to inhibited metabolism, necessitates careful consideration in clinical practice.

Area of Science:

  • Pharmacology
  • Cardiology
  • Geriatrics

Background:

  • Calcium-channel blockers (CCBs) are primary hypertension treatments in the elderly.
  • Macrolide antibiotics are frequently prescribed for infections in this demographic.

Observation:

  • A 78-year-old male on nifedipine, diltiazem, and carvedilol developed severe hypotension and bradycardia after starting clarithromycin.
  • The patient required intensive care with fluid resuscitation and vasoactive agents for management.

Findings:

  • Concomitant use of CCBs and clarithromycin can induce vasodilatory hypotension.
  • Macrolides inhibit cytochrome P450 3A4 (CYP3A4), increasing CCB blood levels.
  • Addition of beta-blockers can further decrease cardiac output, exacerbating hypotension.

Implications:

  • Clinicians must be vigilant for drug interactions between CCBs and macrolides.
  • This interaction poses a significant risk for hypotension in elderly patients.
  • Awareness can prevent adverse events and guide safer prescribing practices.

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