Just knock it out, walk away and let it starve, don't waste narcotics or berries. Once it wakes up knock it out again, usually one arrow to the head. Begin taming from there. Bola is useful if you have trouble hitting its head.
Are you a new Ark player? A Tipp for you. He is fast... faster than you. The best way is craft Bola and Bola the Parasaur. Knock out and feed it with Berries. Dont miss nacoberries... Good you tamed it! Craft a Parasaur saddle and ride it! Good luck.
I see alot of comments giving tips for beginners but some don't realize beginners don't have tranq guns or bola bolas.My advice is punching it unconscious and they do run faster than you so try doing this in a forest with lots of trees since they always get stuck between them.Then feed them mejoberries and narcoberries until tamed.Hoped that helped ❤️