A Cook County jury awarded $18.5 million to a 12-year-old boy and his parents after the mother was given a drug known to cause birth defects while pregnant.The plaintiffs, Charles Muhammad, Angie Muhammad and their son, Charles Muhammad IV, will recover $12 million following a high-low agreement entered before the jury came back from deliberating, according to defense attorneys. The high was $12 million and the low was $2 million.The verdict against Northwestern Memorial Hospital and Medical Center was reached Friday after …