Diabetes Care, Vol 20, Issue 10 1594-1597, Copyright © 1997 by American Diabetes Association
Efficacy and safety of mexiletine in the treatment of painful diabetic neuropathy. The Mexiletine Study Group
P Oskarsson, JG Ljunggren and PE Lins
Department of Internal Medicine, Danderyd Hospital, Sweden.
OBJECTIVE: To investigate the efficacy and safety of mexiletine in the
treatment of painful diabetic neuropathy. RESEARCH DESIGN AND METHODS: A
total of 216 insulin-treated diabetes patients with painful diabetic
neuropathy were randomly allocated to three dosages of mexiletine or
placebo. The Visual Analog Scale (VAS) for pain/discomfort was scored each
day during daytime and nighttime, and sleeping disturbances were also
recorded by the patients. Plasma levels of mexiletine and 24-h
electrocardiogram (ECG) mapping were assessed before and during the 3-week
study period. RESULTS: A significant reduction in sleep disturbances and
pain during nighttime was observed in the group of patients taking the
highest dosages (675 mg/day) of mexiletine compared with the other groups.
No significant correlation was found between plasma concentration of
mexiletine and the therapeutic effect or adverse events. No serious adverse
events were seen. The 24-h ECG mapping did not disclose onset of
significant arrhythmias in any patient. CONCLUSIONS: Mexiletine in a dosage
of 675 mg daily can reduce pain caused by diabetic neuropathy, and the
effect of this drug appears to have a rapid onset.