Hi.... Febrile seizures are convulsions that occur in a child who is between three months and six years of age... If the seizure is prolonged or accompanied by a serious infection or if the source of the infection can't be determined, then your child will be prescribed with the antibiotics.... Usually antipyretics are enough for febrile seizures along with the tepit sponging.... Passing urine more frequently are rare side effects of antibiotics....