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November 1992

Double-blind Parallel Design Pilot Study of Acetyl Levocarnitine in Patients With Alzheimer's Disease

Author Affiliations

From the Departments of Neurology (Drs Sano, Bell, Cote, Dooneief, Marder, Naini, Stern, and Mayeux and Mss Lawton and Legler) and Psychiatry (Drs Stern and Mayeux), Columbia University, College of Physicians and Surgeons; The New York State Psychiatric Institute Memory Disorders Clinic, New York (Drs Sano, Bell, Dooneief, Marder, Stern, and Mayeux); and the Center for Alzheimer's Disease Research (Drs Sano, Marder, Stern, and Mayeux), New York. Dr Sano is a Herbert Irving Assistant Professor in the Department of Neurology.

Arch Neurol. 1992;49(11):1137-1141. doi:10.1001/archneur.1992.00530350051019

• Acetyl levocarnitine hydrochloride has been reported to retard dementia in patients with Alzheimer's disease. In a double-blind, parallel design, placebo-controlled pilot study of 30 mild to moderately demented patients with probable Alzheimer's disease, tests of memory, attention, language, visuospatial, and constructional abilities were administered, and the level of acetyl levocarnitine was measured in the cerebrospinal fluid. Patients were then randomly assigned to receive acetyl levocarnitine hydrochloride (2.5 g/d for 3 months followed by 3 g/d for 3 months) or placebo. After 6 months, the acetyl levocarnitine group demonstrated significantly less deterioration in timed cancellation tasks and Digit Span (forward) and a trend toward less deterioration in a timed verbal fluency task. No differences were found in any other neuropsychological test results. A subgroup with the lowest baseline scores, receiving acetyl levocarnitine, had significantly less deterioration on the verbal memory test and a significant increase in cerebrospinal fluid acetyl levocarnitine levels compared with those receiving placebo. These results suggest that acetyl levocarnitine may retard the deterioration in some cognitive areas in patients with Alzheimer's disease and stress the need for a larger study of this drug.

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