Folks with asthma might better control their symptoms by precisely timing when they use their inhaler, a new study says. A single daily preventive dose of inhaled corticosteroid is best taken at mid-afternoon for effective asthma control, researchers reported April 15 in the journal Thorax . That timing will suppress the usual nighttime worsening of symptoms better than using an inhaler at other times of the day, researchers said. They said the perfect timing is 4 p.m., as the body is most