Side effects of darzalex

First hour of darzalex went off with no hitch. Then we increased drip rate and then i had a reaction. First breathing issues, then shivers and a painful back. We stopped and then restarted darzalex at slower rate. Plus a demeral iv that took care of shakes/rigors and pain. Now back to the drip with more benadryl.  Tired and loopy.