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Levofloxacin improves survival versus TMP-SMX in multidrug-resistant S. maltophilia infectionsLevofloxacin Shows Better Survival for Multidrug-Resistant Stenotrophomonas Infections

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Key Takeaway
Consider levofloxacin for severe S. maltophilia; interpret tigecycline response data cautiously.

This systematic review and meta-analysis examined the comparative efficacy of levofloxacin, minocycline, tigecycline, and TMP-SMX for multidrug-resistant Stenotrophomonas maltophilia infections. The primary outcomes were overall survival and clinical efficacy.

Levofloxacin was associated with significantly improved survival versus TMP-SMX (OR = 2.01; 95% CI 1.16-3.47; P = 0.012). In SUCRA ranking, levofloxacin ranked first for mortality reduction (91.3%). For clinical response, tigecycline showed the highest efficacy (OR = 4.97; 95% CI 1.69-14.61; P = 0.004) and ranked first (91.3%). However, tigecycline showed no survival benefit despite higher clinical response.

The authors suggest levofloxacin should be prioritized for critically ill patients, while high-dose TMP-SMX and tigecycline warrant cautious re-evaluation. Safety data, including adverse events, serious adverse events, discontinuations, and tolerability, were not reported. Limitations of the included studies were not reported, and funding or conflicts of interest were not reported. The certainty of evidence was not reported.

These findings are based on a meta-analysis of observational or heterogeneous studies, and causality cannot be inferred. The results should be interpreted with caution given the lack of safety data and unclear risk of bias.

How this fits prior evidence

This meta-analysis extends prior coverage of antibiotic resistance and treatment optimization, such as the finding that bismuth quadruple or concomitant therapy achieves >85% H. pylori eradication amid rising clarithromycin resistance, and that antibiotic resistance mutations drive H. pylori treatment failure across Asia-Pacific. It similarly addresses a multidrug-resistant pathogen where comparative efficacy data are limited. Unlike prior coverage of minocycline for rosacea, this review evaluates levofloxacin, minocycline, tigecycline, and TMP-SMX for S. maltophilia, a different condition and pathogen. The finding that levofloxacin improves survival versus TMP-SMX contrasts with the lack of survival benefit for tigecycline despite higher clinical response.

This review looked at how different antibiotics perform against Stenotrophomonas maltophilia, a type of bacteria that is often resistant to many drugs. The study compared four specific treatments: levofloxacin, minocycline, tigecycline, and TMP-SMX. The goal was to see which medications were most effective at improving survival and clinical response in patients with these difficult infections.

The results showed that levofloxacin significantly improved survival rates compared to TMP-SMX. While tigecycline showed the highest clinical response, it did not show a specific survival benefit in the data. Based on ranking systems, levofloxacin was ranked first for reducing mortality, while tigecycline was ranked first for overall clinical efficacy.

Because these infections are hard to treat, these findings suggest that levofloxacin might be a priority for critically ill patients. However, the evidence is based on a meta-analysis of existing data. Patients and doctors should discuss these specific treatment options and their risks with a medical professional to determine the best plan for individual care.

What this means for you:
Levofloxacin showed better survival rates than TMP-SMX for certain resistant infections, while tigecycline showed high clinical response.

Common questions

Which antibiotic is best for survival in these infections?

The study found that levofloxacin significantly improved survival compared to TMP-SMX. In ranking systems for mortality reduction, levofloxacin ranked first with a score of 91.3%.

What was the result for tigecycline treatment?

Tigecycline showed the highest clinical response among the drugs studied. While it ranked first for efficacy with a score of 91.3%, it did not show a specific survival benefit in the results.

How does levofloxacin compare to TMP-SMX?

The data showed that levofloxicin significantly improved survival rates compared to TMP-SMX. The results indicated an odds ratio of 2.01 for survival when comparing the two treatments.

Study Details

Study typeSystematic review
EvidenceLevel 1
PublishedOct 2026
View Original Abstract ↓
OBJECTIVES: To evaluate the clinical efficacy and survival benefits of alternative antimicrobial regimens compared to conventional TMP-SMX in treating multidrug-resistant Stenotrophomonas maltophilia infections. METHODS: We searched PubMed, Embase, Cochrane, and Web of Science up to April 2026 for cohorts comparing TMP-SMX, levofloxacin, minocycline, and tigecycline. A frequentist random-effects network meta-analysis was performed. Primary outcomes were overall survival and clinical efficacy (odds ratios [ORs] with 95% CIs). Treatments were ranked by SUCRA. RESULTS: Fifteen cohorts were included. Levofloxacin significantly improved survival versus TMP-SMX (OR = 2.01, 95%CI 1.16-3.47, P = 0.012). Tigecycline showed the highest clinical response (OR = 4.97, 95%CI 1.69-14.61, P = 0.004) but no survival benefit. SUCRA ranked levofloxacin first for mortality reduction (91.3%) and tigecycline first for efficacy (91.3%); minocycline performed consistently across endpoints. CONCLUSIONS: A "survival paradox" exists in SMA treatment: tigecycline yields superior initial response without improving survival, whereas levofloxacin provides the most significant survival benefit. Levofloxacin should be prioritized for critically ill patients, while high-dose TMP-SMX and tigecycline warrant cautious re-evaluation.
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