An anti-epileptic drug may help treat symptoms of a condition that affects as many as 1 in 10 people in developing countries. In a clinical study the drug helped reduce the incidence of seizures in people whose central nervous systems have become infected with the pork tapeworm taenia solium. The condition is associated with seizures, headache, and other neurological symptoms, but of these, seizures are the most common, occurring in nearly 90 percent of all patients.