As a new school year begins, parents and doctors find medication shortages are leading to declines in learning and self-esteem.Credit…Taylor Glascock for The New York TimesAug. 15, 2023Updated 6:35 p.m. ETIn the spring, Riana Shaw Robinson learned that her 11-year-old son, Madison, had sprinted out of class to chase a squirrel through his school’s courtyard
