InChI=1S/C17H20N2S/c1-13(18(2)3)12-19-14-8-4-6-10-16(14)20-17-11-7-5-9-15(17)19/h4-11,13H,12H2,1-3H3 ☑ Y. Key:PWWVAXIEGOYWEE-UHFFFAOYSA-N ☑ Y. (verify). Promethazine is a first-generation antihistamine. It is used to treat allergies, trouble sleeping, Use is not recommended in those less than...