Sugar pills worked as well at preventing kids' migraines as two commonly used headache medicines, but had fewer side effects, in a study that may lead doctors to rethink how they treat a common ailment in children and teens. It's the first rigorous head-to-head test in kids of two generic prescription drugs also used for adults' migraines: topiramate, an anti-seizure medicine, and amitriptyline, an anti-depressant. The idea was to see if either drug could reduce by half the number of days kids had migraines over a month's time. Both drugs worked that well - but so did placebo sugar pills. The results really challenge what is typical practice today by headache specialists," said study author Scott Powers, a psychologist at Cincinnati Children's Hospital. "The fact that it shows that two of the most commonly used medications are no more effective than a placebo and have adverse effects makes a very clear statement," said Dr. Leon Epstein, neurology chief at Ann & Robert Lurie H. Children's Hospital of Chicago. The only government-approved migraine medication for kids is topiramate. Side effects from the drugs [included] fatigue, dry mouth and forgetfulness. Kids on topiramate also had tingling sensations in their hands, arms, legs or feet. There was one suicide attempt in the topiramate group, another known side-effect of that drug. The side effects were not unexpected, but given the risks, the results suggest the drugs shouldn't be "first-line prevention treatments" for kids' migraines, Powers said.