Shares of Tylenol maker Kenvue bounced back sharply at the opening bell Tuesday, a day after President Donald Trump promoted unproven and in some cases discredited ties between Tylenol, vaccines, and autism. "Don't take Tylenol," Trump instructed pregnant women around a dozen times during the White House news conference Monday, also urging mothers not to give their infants the drug, known by the generic name acetaminophen in the U.S. or paracetamol in most other countries.