A prospective double-blind, randomized clinical trial of levocarnitine to treat autism spectrum disorders.

Abstract

BACKGROUND:

L-carnitine was proposed as a potential treatment for patients diagnosed with an autism spectrum disorder to improve mitochondrial dysfunction, but no prior randomized controlled trials have been conducted.

MATERIAL/METHODS:

Thirty subjects diagnosed with an ASD were randomly assigned to receive a standardized regimen (50 mg L-carnitine/kg bodyweight/day) of liquid L-carnitine (n=19) or placebo (n=11) for 3-months. Measures included changes in professionally completed Childhood Autism Rating Scale (CARS), hand muscle testing, and modified clinical global impression (CGI) forms; parent completed Autism Treatment Evaluation Checklist (ATEC), treatment adherence measurement (TAM), frequency and intensity of side effect rating (FISER)/global rating of side effect burden (GRSEB)/patient report of incidence of side effects (PRISE) forms; and lab testing.

RESULTS:

Significant improvements were observed in CARS (-2.03, 95% CI=-3.7 to -0.31), CGI (-0.69, 95% CI=-1.1 to -0.06), and ATEC scores. Significant correlations between changes in serum free-carnitine levels and positive clinical changes were observed for hand muscle strength (R2=0.23, P=0.046), cognitive scores (R2=0.27, P=0.019), and CARS scores (R2=0.20, P=0.047). Study subjects were protocol-compliant (average adherence was >85%) and generally well-tolerated the L-carnitine therapy given.

CONCLUSIONS:

L-carnitine therapy (50 mg/kilogram-bodyweight/day) administered for 3-months significantly improved several clinical measurements of ASD severity, but subsequent studies are recommended.

• Authors: David A Geier, Janet K Kern, Georgia Davis, Paul G King, James B Adams, John L Young, Mark R Geier
• Journal: Medical science monitor : international medical journal of experimental and clinical research (Med Sci Monit) Vol. 17 Issue 6 Pg. PI15-23 (Jun 2011) ISSN: 1643-3750 [Electronic] United States
• PMID: 21629200 (Publication Type: Journal Article, Randomized Controlled Trial, Research Support, Non-U.S. Gov't)

Chemical References

• Placebos
• Carnitine

Topics

• Carnitine (blood, chemistry, therapeutic use)
• Child
• Child Development Disorders, Pervasive (blood, drug therapy, physiopathology)
• Child, Preschool
• Cognition (physiology)
• Cohort Studies
• Double-Blind Method
• Female
• Humans
• Male
• Placebos