The Collaborative International Dictionary of English v.0.48:

Vasohypertonic \Vas`o*hy`per*ton"ic\, a. [See Hyper-, and
   Tonic.]
   See Vasoconstrictor.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Vasoconstrictor \Vas`o*con*strict"or\, a. (Physiol.)
   Causing constriction of the blood vessels; as, the
   vasoconstrictor nerves, stimulation of which causes
   constriction of the blood vessels to which they go. These
   nerves are also called vasohypertonic.
   [1913 Webster]