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Acyclovir treatment of relapsing-remitting multiple sclerosis. A randomized, placebo-controlled, double-blind study.

Journal article
Authors Jan Lycke
Bo Svennerholm
Elisabeth Hjelmquist
Lars Frisén
Gaby Badr
Mats Andersson
A Vahlne
Oluf Andersen
Published in Journal of neurology
Volume 243
Issue 3
Pages 214-24
ISSN 0340-5354
Publication year 1996
Published at Institute of Clinical Neurosciences
Institute of Laboratory Medicine, Dept of Clinical Virology
Pages 214-24
Language en
Keywords Acyclovir, adverse effects, therapeutic use, Administration, Oral, Adolescent, Adult, Antibodies, Viral, blood, Antiviral Agents, adverse effects, therapeutic use, Double-Blind Method, Female, Herpesviridae, immunology, Humans, Male, Middle Aged, Multiple Sclerosis, drug therapy, immunology, virology, Placebos, Recurrence, Remission Induction, Tablets
Subject categories Neurology, Ophthalmology


Acyclovir treatment was used in a randomized, double-blind, placebo-controlled clinical trial with parallel groups to test the hypothesis that herpes virus infections are involved in the pathogenesis of multiple sclerosis (MS). Sixty patients with the relapsing-remitting form of MS were randomized to either oral treatment with 800 mg acyclovir or placebo tablets three times daily for 2 years. The clinical effect was investigated by an extensive test battery consisting of neurological examinations, neuro-ophthalmological and neuropsychological tests, and evoked potentials. Results were based on "intent-to-treat" data and the primary outcome measure was the exacerbation rate. In the acyclovir group (n = 30), 62 exacerbations were recorded during the treatment period, yielding an annual exacerbation rate of 1.03. The placebo group (n = 30) had 94 exacerbations and an annual exacerbation rate of 1.57. Thus, 34% fewer exacerbations were encountered during acyclovir treatment. This difference in exacerbation rate between the treatment groups was not significant (P = 0.083). However, this trend to a lower disease activity in acyclovir-treated patients was supported in subsequent data analysis. If the patients were grouped according to exacerbation frequencies, i.e. into low (0-2), medium (3-5) and high (6-8) rate groups, the difference between acyclovir and placebo treatment was significant (P = 0.017). Moreover, in a subgroup of the population with a duration of the disease of at least 2 years providing an exacerbation rate base-line before entry, individual differences in exacerbation rates were compared between the 2-year pre-study period and the study period in acyclovir-treated (n = 19) and placebo (n = 20) patients and acyclovir-treated patients showed a significant reduction of exacerbations (P = 0.024). Otherwise, neurological parameters were essentially unaffected by acyclovir treatment and there were no convincing signs of reduced neurological deterioration in the acyclovir group. This study indicates that acyclovir treatment might inhibit the triggering of MS exacerbations and thus suggests that acyclovir-susceptible viruses might be involved in the pathogenesis of MS. This possibility warrants further investigation.

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