“…Sympathomimetic drugs, such as amphetamine and ephedrine, are also positive in the acetylcholine test. Some authors, however, believe that sympathomimetic drugs do have an analgesic effect in man (Ivy, Goetzl, Harris & Burrill, 1944;Harris & Worley, 1957 ;Benassi & Munarini, 1958 ;Randall, 1963 ;Lim, Miller, Guzman, Rodgers, Rogers, Wang, Chao & Shih, 1967 Kast & Collins (1964); Keats & Telford (1956); Lasagna (1964) ;Lasagna, De Kornfeld & Pearson (1964); Light & Fink (1965);and Pearson & Lasagna (personal communication). Parenteral treatment in man refers to the subcutaneous or intramuscular route.…”