Elvis also had the painkillers morphine and Demerol; tranquilizers Placidyl and Valium; and Chlorpheniramine, an antihistamine.
“He gave me a blue pill, which he said was an antihistamine,” said Chelan.
And, Zyrtec, an antihistamine, was the highest grossing nonfood of 2008, coming in at $316 million in sales.
antihistamine an·ti·his·ta·mine (ān'tē-hĭs'tə-mēn', -mĭn)
Any of several drugs used to counteract the physiological effects of histamine.