1. vasoconstrictor - Noun
2. vasoconstrictor - Adjective
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.
A substance which causes constriction of the blood vessels. Such substances are used in medicine to raise blood pressure.
Source: Webster's dictionaryThe major disadvantages of this use are cocaine's intense vasoconstrictor activity and the potential for cardiovascular toxicity. Source: Internet
Nosebleeds after cocaine insufflation are due to irritation and damage of mucus membranes by foreign particles and adulterants and not the cocaine itself; as a vasoconstrictor, cocaine acts to reduce bleeding. Source: Internet
When the platelets bind to a clot, they release serotonin, where it serves as a vasoconstrictor and helps to regulate hemostasis and blood clotting. Source: Internet