As nouns the difference between relaxant and hydralazine
is that relaxant is something which promotes relaxation while hydralazine is a direct-acting smooth muscle relaxant used to treat hypertension by acting as a vasodilator primarily in arteries and arterioles.
relaxant
English
Noun
(
en noun)
Something which promotes relaxation.
References
* OED2
----
hydralazine
English
Noun
(
wikipedia hydralazine)
A direct-acting smooth muscle relaxant used to treat hypertension by acting as a vasodilator primarily in arteries and arterioles.