Definition of "neosynephrine"

The method of anesthetizing the mother is as follows: […] The mother is given ¼ cc. of neosynephrine intramuscularly immediately and the blood pressure taken.

1951 February, Forrest H. Howard, “The Physiologic Position for Delivery”, in Northwest Medicine, volume 50, number 2, Portland, Ore.: Northwest Medical Publishing Association, page 99