PAM, a cholinesterase reactivator, was administered orally and parenterally to 37 patients with multiple sclerosis and a control group of 24 patients with other neurological diseases and pain syndromes. The effects of the administration of this compound in these patients with and without electrical stimulation of the spinal cord were studied. The clinical response to the drug follows a known time course and is dose related. Administration of large doses orally or intravenously aggravates existing neurological dysfunction. With a dose of 1,000 mg intravenously, a characteristic response is the temporary appearance of new ophthalmological abnormalities, followed by significant improvement in motor control and behavior, which gradually subsides. Parenteral administration is superior to oral. Tolerance to the drug is observed. The presence of electrical stimulation of the spinal cord complements the action of the drug. When electrical stimulation is withdrawn, the effect of the drug reproduces the effect of the electrical stimulation. It is suggested there is a defect in cholinesterase in multiple sclerosis patients, and its reactivation may have a significant relationship to signs and symptoms.
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