Alarming new research shows that many children taking widely-used antipsychotic(抗精神病の)medications gain weight and become overweight or obese in as little as 11 weeks. While weight gain is a known side-effect of some antipsychotic drugs, the study suggests that children and teens may be more vulnerable than adults in this respect. Doctors worry that the weight gain, in combination with increases in cholesterol and other blood fats that have also been linked to these drugs, may make these children more prone to cardiac problems in adulthood.