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Subcutaneous methotrexate improves ACR20 response and reduces GI side effects in RASubcutaneous Methotrexate Shows Better Tolerance for Rheumatoid Arthritis Patients

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Key Takeaway
Consider subcutaneous methotrexate for RA patients with inadequate response or GI intolerance to oral methotrexate.

This meta-analysis of 9 randomized controlled trials including 974 patients with rheumatoid arthritis compared subcutaneous methotrexate to oral methotrexate. The primary outcome was ACR20 response rate, which was significantly increased with subcutaneous administration (RR = 1.15; 95%CI: 1.05, 1.25). Secondary outcomes showed a similar benefit for ACR50 response (RR = 1.14; 95%CI: 1.01, 1.29), though this result was attenuated in a fixed-effect sensitivity analysis. No statistically significant differences were observed for ACR70 response, DAS28-ESR score, bioavailability area under the curve, or Cmax.

Gastrointestinal tolerability favored subcutaneous methotrexate, with reduced gastrointestinal-related adverse events (RR = 0.58; 95%CI: 0.40, 0.83) and diarrhea (RR = 0.42; 95%CI: 0.21, 0.84). Other adverse events showed no significant differences. Serious adverse events and discontinuations were not reported.

Limitations include attenuated ACR50 results in sensitivity analysis and less certain evidence for ACR70, DAS28-ESR, and bioavailability outcomes. The authors note that subcutaneous methotrexate may be an effective and generally well-tolerated option, particularly for patients with inadequate response or poor gastrointestinal tolerability to oral methotrexate.

How this fits prior evidence

This meta-analysis extends prior evidence on methotrexate optimization in RA by quantifying the benefit of subcutaneous over oral administration. While prior coverage focused on biologic/targeted synthetic DMARDs and novel mechanisms (e.g., extracellular vesicles, succinate pathways), this analysis addresses a practical question about an established csDMARD. The finding of improved ACR20 response (RR 1.15) and reduced GI adverse events (RR 0.58) aligns with clinical experience, but the attenuated ACR50 result and uncertain evidence for ACR70 and DAS28-ESR temper the conclusion.

A review of nine clinical trials involving 974 patients compared two ways of taking methotrexate: oral and subcutaneous (under the skin). The study looked at how well each method worked for managing symptoms of rheumatoid arthritis and how they affected the body.

The findings showed that patients who received subcutaneous methotrexate had higher rates of improvement in their condition, specifically measured by ACR20 and ACR50 scores. Additionally, those receiving the injection experienced fewer gastrointestinal issues, such as diarrhea, compared to those taking the pill. Other measures, like the amount of medicine in the blood or specific high-level improvement goals, did not show a significant difference between the two methods.

While subcutaneous methotrexate appears to be well-tolerated and effective, some results were less certain because of the limited data available for certain metrics. This finding suggests that injections could be a helpful option for patients who struggle with stomach problems or do not see enough progress on oral medication. You should talk to your doctor to see if this delivery method is right for your specific treatment plan.

What this means for you:
Subcutaneous methotrexate may improve results and reduce stomach side effects for some people with rheumatoid arthritis.

Common questions

Is subcutaneous methotrexate safer than taking it by mouth?

The study found that patients receiving subcutaneous methotrexate had significantly fewer gastrointestinal-related issues, including a lower rate of diarrhea. While both methods are used to treat rheumatoid arthritis, the injection was reported as well-tolerated for those who have trouble with stomach symptoms from oral pills.

Does the way I take methotrexate change how well it works?

The study showed that patients receiving subcutaneous methotrexate had higher ACR20 and ACR50 response rates compared to those taking oral medication. However, there was no significant difference found in other measures like the amount of medicine in the blood or specific high-level improvement scores.

Who would benefit most from a subcutaneous injection?

This delivery method may be an effective option for patients who do not have a good response to oral methotrexate or who experience poor gastrointestinal tolerability. You should consult your doctor to determine if switching methods is appropriate for your specific condition.

Study Details

Study typeMeta analysis
EvidenceLevel 1
PublishedJul 2026
View Original Abstract ↓
To integrate evidence from randomized controlled trials (RCTs) comparing subcutaneous (SC) and oral methotrexate (MTX) for rheumatoid arthritis (RA) to provide optimal clinical treatment strategies. This meta-analysis conducted comprehensive search of PubMed, Web of Science, Embase and Cochrane Library, retrieving all relevant RCTs published up to June 18, 2025. Random-effects models were utilized to calculate the relative risk (RR), mean difference (MD) and their 95% confidence intervals (CIs), to evaluate efficacy and safety between subcutaneous injections and oral administration of MTX. A total of 1,034 articles were retrieved, and 9 RCTs that met the criteria were ultimately included, involving 974 RA patients in total. In the primary random-effects analyses, compared to oral MTX, subcutaneous MTX increased the ACR20 response rate (RR = 1.15; 95%CI: 1.05, 1.25), increased the ACR50 response rate (RR = 1.14; 95%CI: 1.01, 1.29), and reduced the incidence of gastrointestinal (GI)-related adverse event (AE) (RR = 0.58; 95%CI: 0.40, 0.83) and diarrhea (RR = 0.42; 95%CI: 0.21, 0.84). Fixed-effect sensitivity analyses supported the ACR20 and GI-related safety findings, but the ACR50 result was attenuated. Subcutaneous MTX did not show statistically significant differences in ACR70 response rate, DAS28-ESR score, bioavailability area under the curve, Cmax, or the incidence of other AE. Compared with oral administration, subcutaneous MTX was associated with a higher ACR20 response and lower GI-related AE and diarrhea in the primary random-effects analyses. These findings suggested that subcutaneous MTX may be an effective and generally well-tolerated option, particularly for patients with inadequate response or poor gastrointestinal tolerability to oral MTX, while evidence for ACR50, ACR70, DAS28-ESR and bioavailability remains less certain.
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