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Real-world daptomycin use with a focus on muscle toxicity: A multicentric retrospective study
C Airaud1, E Demay2, V Dias Meireles3
1University Hospital (CHU), Poitiers, France.
Background:
Daptomycin is increasingly used to treat Gram-positive infections, but carries a risk of muscle toxicity. Despite guideline recommendations, real-world adherence to safety monitoring remains poorly documented.
Objectives:
To evaluate daptomycin prescribing practices and identify risk factors for muscle toxicity across three French university hospitals.
Methods:
We conducted a retrospective multicenter study of adults (≥18 y) treated with daptomycin between June 2021 and May 2022. Data included demographics, treatment, monitoring, microbiology, and adverse events. Muscle toxicity was defined as an elevation of creatine kinase (CK) (>5 upper normal value) and/or rhabdomyolysis, identified by explicit documentation in medical records. Logistic regression identified associated factors.
Results:
We collected data from 1407 patients (65.1% male; mean age 62.4 ± 16.5) treated with daptomycin during the study period, for a mean duration of 7.87 ± 7.05 d. Most patients (93.9%) received high-dose daptomycin, ≥8 mg/kg/d. Combination therapy was frequent (72%), mostly with β-lactams (91.8%). CK monitoring was reported in 34.2% of patients, muscle toxicity was reported in 4.9%, including rhabdomyolysis in 2.7%. Statins were co-prescribed without discontinuation in 15.6% of cases. In multivariate analysis, concomitant use of high-risk comedications, including statins and fibrates (OR [95% CI] = 6.68 [3.28-13.97], P < 0.001) and obesity (OR 2.25 [1.07-4.72], P = 0.03) were independently associated with muscle toxicity.
Conclusion:
Despite widespread use of high-dose daptomycin, safety monitoring was inconsistent. Systematic CK testing and careful review of myotoxic co-medications are essential to mitigate adverse events in clinical practice.
Insights
Daptomycin use for Gram-positive infections shows inconsistent safety monitoring, increasing muscle toxicity risk. Co-prescribing statins, fibrates, or obesity independently elevate this risk, necessitating careful medication review and CK testing.
Area of Science:
- Pharmacology
- Clinical Medicine
- Infectious Diseases
Background:
- Daptomycin is a key antibiotic for Gram-positive infections.
- Muscle toxicity is a known adverse effect of daptomycin therapy.
- Real-world adherence to daptomycin safety monitoring guidelines is not well-documented.
Purpose of the Study:
- To assess daptomycin prescribing patterns in French university hospitals.
- To identify factors associated with daptomycin-induced muscle toxicity.
- To evaluate the consistency of safety monitoring practices.
Main Methods:
- Retrospective multicenter study of 1,407 adult patients treated with daptomycin.
- Data collected on demographics, treatment, monitoring, and adverse events.
- Muscle toxicity defined by creatine kinase (CK) elevation or rhabdomyolysis; logistic regression used for risk factor analysis.
Main Results:
- High-dose daptomycin (≥8 mg/kg/day) was used in 93.9% of patients.
- CK monitoring occurred in only 34.2% of patients.
- Muscle toxicity reported in 4.9%, including rhabdomyolysis in 2.7%.
- Concomitant use of statins/fibrates (OR 6.68) and obesity (OR 2.25) were significant risk factors for muscle toxicity.
Conclusions:
- Daptomycin safety monitoring, particularly CK testing, was inconsistent despite high-dose usage.
- Systematic CK monitoring and careful evaluation of myotoxic co-medications are crucial.
- Mitigating daptomycin-related muscle toxicity requires vigilant clinical practice.
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