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Potentiation of ampicillin skin reactions by allopurinol or hyperuricemia
Journal of Clinical Pharmacology
|October 1, 1981
Abstract:
Of 4434 hospitalized medical patients who received ampicillin in the absence of allopurinol, 251 (5.9 per cent) developed a rash within 21 days of exposure. Of 252 patients who received ampicillin and allopurinol together, 35 (13.9 percent) developed a rash. The present data confirm the previously reported increase in rash frequency in patients who receive both ampicillin and allopurinol.
Insights
The combination of ampicillin and allopurinol significantly increases the risk of developing a rash in hospitalized patients. This study confirms a higher incidence of ampicillin-induced rash when co-administered with allopurinol.
Area of Science:
- Pharmacology
- Clinical Medicine
- Drug Safety
Background:
- Ampicillin is a widely used antibiotic.
- Allopurinol is a common medication for gout and hyperuricemia.
- Previous reports suggest a potential interaction between ampicillin and allopurinol.
Purpose of the Study:
- To investigate the frequency of rash development in patients receiving ampicillin alone versus in combination with allopurinol.
- To confirm or refute the association between co-administration of ampicillin and allopurinol and increased rash incidence.
Main Methods:
- Retrospective analysis of hospitalized medical patients.
- Comparison of rash incidence in two groups: ampicillin only vs. ampicillin plus allopurinol.
- Rash occurrence was monitored within 21 days of drug exposure.
Main Results:
- A total of 4434 patients received ampicillin without allopurinol, with 5.9% developing a rash.
- In 252 patients receiving both ampicillin and allopurinol, 13.9% developed a rash.
- The incidence of rash was significantly higher in patients taking both medications concurrently.
Conclusions:
- The concurrent use of ampicillin and allopurinol is associated with a substantially increased risk of developing a rash.
- Healthcare providers should be aware of this interaction and monitor patients closely when prescribing these medications together.
- Further research may be warranted to elucidate the underlying mechanisms of this drug interaction.