“…one or two antihistamines (Table ). Only four research teams (O'Brien et al , ; Giachetti et al , ; Hattori et al , ; Nishikawa et al , ) managed to determine simultaneously different antihistamines along with other drugs in biological samples using NPD or FID. MS detection by chemical ionization (CI) (Fouda et al ., ; Kageura et al , ; Seno et al , ) and electron impact‐selected ion monitoring (EI‐SIM) (Kintz et al , ; Thompson and Leffert, ; Seno et al , ; Tonn et al , ; Martens, ; Hasegawa et al , ; Pujadas et al , ) have also been used for the determination of antihistamines after GC separation.…”