1st plot: The openFDA deposits adverse reaction events. The event data from the reporters who got adverse reaction at the same time of taking ZYRTEC, a popular anti-histamine OTC, were retrieved. The patient info, such as onset age, weight, sex, other drugs taking, and adverse reactions, were cleaned up and analyzed. This plot shows that, comparing male and female reporters, a portion of young males (less than 25 yrs old) are distinctly subject to some adverse reactions.