Sulodexide in the treatment of patients with early stages of COVID-19: a randomised controlled trial

Background Targeting endothelial cells has been suggested for the treatment of patients with COVID-19 and sulodexide has pleiotropic properties within the vascular endothelium that can prove beneficial to the same. We aimed to evaluate the effect of sulodexide when used in the early clinical stages of COVID-19. Methods We conducted a single-centre, outpatient setting, randomized controlled trial with a parallel-group design in Mexico. Including patients within three days of clinical symptom onset, who were at a high risk of severe clinical progression due to chronic comorbidities. Participants were randomly allocated to receive an oral dose of sulodexide (500 LRU twice a day) or the placebo for 21 days. Primary outcomes were need and length of hospitalization, need and length of oxygen support. Results Between June 5 and August 30, 2020, 243 patients were included in the per-protocol analysis. One hundred twenty-four of them received sulodexide, while 119 received placeboes. At 21 days follow-up, 22 of 124 patients required hospitalisation in the sulodexide group compared to 35 of 119 in the placebo group [relative risk (RR), 0.6; 95% confidence interval (CI), 0.37-0.96; p=0.03]. Fewer patients required oxygen support in the sulodexide group [37 of 124 vs. 50 of 119; RR, 0.71; 95% CI, 0.5 to 1; p=0.05], and for fewer days [9 (7.2 SD) in the sulodexide group vs. 11.5 (9.6 SD) in the placebo group; p=0.02]. There was no between-group difference concerning the length of hospital stay. Interpretation Early intervention in COVID-19 patients with sulodexide reduced hospital admissions and oxygen support requirements. This has beneficial implications in the patient well-being, making sulodexide a favorable medication until an effective vaccine or an antiviral becomes available. Funding Researcher independently initiated, partially funded by Alfasigma, Mexico. Listed in the ISRCTN registry under ID ISRCTN59048638.