Guanethidine sulfate in the prevention of autonomic hyperreflexia.

Autonomic hyperreflexia constitutes the only medical emergency seen in spinal cord injury patients. Uncontrolled hypertension and bradycardia can result in seizures and death. The acute treatment of the syndrome has ranged from medical ganglionic blockers to topical anesthetic agents to surgical procedures. The oral use of 10 mg. guanethidine sulfate 3 times daily successfully prevented the major symptoms of the syndrome in 200 spinal cord injury patients with lesions above T5. Toxicity has been mild and the drug is recommended until the patients are voiding and are capable of self-care.