BACKGROUND Lumbodorsal fasciitis (LF) is a condition in which muscle and fascial lesions cause low back pain (LBP) and limited mobility. This retrospective study aimed to explore the efficacy and safety of ultrasound-guided fascial hydrodissection combined with eperisone for treating LF. MATERIAL AND METHODS A total of 103 patients with LF were selected and divided into a combined therapy (CT) group (ultrasound-guided fascial hydrodissection and oral drugs of eperisone) and single medication (SM) group (oral drugs of celecoxib and eperisone). Outcomes were evaluated using the visual analog scale (VAS) and Oswestry disability index (ODI) at baseline and at 2 weeks, 1 month, and 3 months after treatment. The adverse reactions and complications of the 2 groups were recorded. RESULTS There were no significant differences in the baseline characteristics of the 2 groups (P>0.05). After treatment, all scores showed a statistically significant improvement at 2 weeks and 1 month (P<0.05). The VAS and ODI scores showed a significant effect by time and group (P<0.001). The results also showed significant group-by-time interactions (P<0.001). Patients in the CT group had lower scores at any follow-up time (P<0.05). At 3 months, the scores slightly increased. There were no adverse reactions or complications in the CT group; however, the SM group had 4 cases of gastrointestinal reactions. CONCLUSIONS Ultrasound-guided fascial hydrodissection combined with eperisone therapy can effectively relieve LBP and improve lumbar function in treating LF. Moreover, this procedure is considered safe.