A randomized, double-blind, placebo-controlled, parallel-group 12-week pilot phase II trial of SaiLuoTong (SLT) for cognitive function in older adults with mild cognitive impairment

Introduction: This study primarily aimed to evaluate the efficacy and safety of SaiLuoTong (SLT) on cognition in mild cognitive impairment (MCI).

Methods: Community-dwelling people with MCI aged ≥60 years were randomly assigned to 180 mg/day SLT or placebo for 12 weeks.

Results: Thirty-nine participants were randomized to each group (N = 78); 65 were included in the final analysis. After 12 weeks, the between-groups difference in Logical Memory delayed recall scores was 1.40 (95% confidence interval [CI]: 0.22 to 2.58; P = 0.010); Delis-Kaplan Executive Function System Trail Making Test Condition 4 switching and contrast scaled scores were 1.42 (95% CI: -0.15 to 2.99; P = 0.038) and 1.56 (95% CI: -0.09 to 3.20; P = 0.032), respectively; Rey Auditory Verbal Learning Test delayed recall was 1.37 (95% CI: -0.10 to 2.84; P = 0.034); and Functional Activities Questionnaire was 1.21 (95% CI: -0.21 to 2.63; P = 0.047; P < 0.001 after controlling for baseline scores).

Discussion: SLT is well tolerated and may be useful in supporting aspects of memory retrieval and executive function in people with MCI.

Highlights: SaiLuoTong (SLT) improves delayed memory retrieval and executive function in people with mild cognitive impairment (MCI).SLT is well tolerated in people ≥ 60 years.The sample of community dwellers with MCI was well characterized and homogeneous.