a-PvP muscle tensing question

[(zonk)]

I have tried many stims, a-PVP for the 1st time did something completely different. I got a weird visual effect from it, not sure if it has some anticholinergic effects or not but my muscles tensed up ridiculously, this has never happened on other stims, I felt dry and my skin seemed to take on a rubbery affect mostly near injection site. Thought maybe I did too much but it happens even in smaller doses.

Can someone explain what causes this and is there a good way to combat it? Usually when/if I experience a side effect like this I simply just wont take it anymore but it did some mindblowing effects especially combined with mxe that I feel I need to explore more(just a little). I feel like there's something unique and special about it(sounds crazy), but I've never gotten these effects from anything else both good and bad.

 

[sekio]

How much are you shooting?

Muscular tension sounds like either a histamine/norepinephrine response to the drug

 

[(zonk)]

20mg . like my muscles wont move when i want to, then they lock(get stuck), I really can't move much comfortably, (hope its not an impurity), the stuff doesnt really crystalize either it seems latex-like. Everything looks like it has water running over it is the visual effect. But it gave me one of the most awesome trips of my life when combined with MXE. So i'm curious as to what's going on in all of it's effects.