Arteriolar vasodilator
{{short description|Substance or medication that preferentially dilates arterioles}}
Arteriolar vasodilators are substances or medications that preferentially dilate arterioles. When used on people with certain heart conditions, it causes a phenomenon known as the cardiac steal syndrome.{{cn|date=April 2019}} Arteriolar vasodilators increase intracapillary pressure, which causes fluid to enter the tissues, leading to vasodilatory edema.{{cite journal |last1=Messerli |first1=F |title=Vasodilatory edema: a common side effect of antihypertensive therapy |journal=American Journal of Hypertension |date=September 2001 |volume=14 |issue=9 |pages=978–979 |doi=10.1016/s0895-7061(01)02178-1 |pmid=11587169|issn=0895-7061|doi-access=free }}
Arteriolar vasodilators include: