Yeah, that one can be a pain. If you have to, bring extra antidotes with you. Pretty sure you can buy them from the shop.
Learn how he moves. You have plenty of time to kill the monster, so if you need to step back and see how the monster moves, do it. Be patient. Also, if you get flashed, you will get stunned, you can button mash your way out of it. Or if you are lucky, your palicoe can attack you t knock you out of it. If you are online, your fellow hunters can hit you.
Also, what armor are you using? Better armor may help you.
One more thing, and this one is for everyone. Check out this person's videos. He gives a bunch of tips and tutorial guides to the weapons, which helped me out a lot for some of the changes they did to all the weapons.
https://www.youtube.com/channel/UCT84SVapAfSSD_iMfpKbFbA