I remember watching a Sci-Fi or Action Movie film, possibly 1960s or 70s that featured a scene were when swallowing a bizarre 'pill' the victim simply vanished or vaporised etc
One particular scene is were a female agent secretes the pill into her mouth then seduces a lab worker, kissing him and forcing the pill into his...'WHAP!' he instantly disappears
Film was similar to Our Man Flint type
Anyone know name of film please?