It also constrict blood vessels, and incidentally the vasoconstrictor drug called vasopressin is just ADH.

同时ADH也可以收缩血管，而一种名为血管升压素的血管收缩类药物其实就是ADH。

And it's a vasoconstrictor, which means it narrows blood vessels and slows the flow of blood.

它是一种血管收缩剂，这意味着它能够使血管变窄，减缓血液流动。

The underlying mechanism causing vasospasms isn't well understood, but likely involves vasoconstrictors like platelet thromboxane A2.

痉挛的机制不清，但可能与缩血管分子TXA2有关。