Yes. You did the right thing. Any medication that causes a reaction, should be discontinued immediately. The drug can cause certain parasites to release agents, that react with the chemistry in your bowel system.
In my case, I had a bowel movement that came 'half out' and just got stuck. I had to wait about ten minutes, before it came out. I did not force it, but there was blood. I checked the blood under the microscope, and found that it was not human.
So, the moral of this story is, the drug may cause temporary blockages in the gut. So, drink tons of water, if you decide to continue. Don't let those suc***s win!