<unk> ium metilsulfate (INN) or<unk>  is an antihistamine. The USAN is<unk> ium chloride (with a different counterion).
Thiazinam
Clomethiazole
Trichlormethiazide
Iproniazide
Periciazine
Polythiazide
Vindesine
Sulfathiazole