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Minoxidil and pericardial effusion: an idiosyncratic reaction
Clinical Pharmacology and Therapeutics
|July 1, 1981
Summary
Minoxidil, an effective antihypertensive vasodilator, can cause pericardial effusion, a serious side effect. Limiting its use is recommended due to the unpredictable and potentially fatal nature of this reaction.
Area of Science:
- Cardiology
- Pharmacology
Background:
- Minoxidil is a potent antihypertensive vasodilator.
- Its clinical utility is constrained by potential adverse cardiovascular events, specifically pericardial effusion.
Observation:
- Echocardiography revealed no significant effusions in 22 patients on active minoxidil treatment.
- Review of 15 former patients identified effusion in seven and transient pericarditis in one.
Findings:
- Pericardial effusion resolved upon minoxidil withdrawal in five patients.
- Rechallenge with minoxidil led to effusion in one patient.
- A 4.8% incidence of pericardial disease, including tamponade and deaths, was reported in experimental subjects.
Implications:
- The idiosyncratic and potentially fatal nature of minoxidil-associated pericardial effusion necessitates cautious use.
- Patient characteristics do not reliably predict effusion risk, reinforcing the need for careful monitoring.
- Continued limitation of minoxidil use is advised to mitigate risks of severe pericardial complications.