I've Been Given A Prescription Called Viberzi And Had An

I've been given a prescription called Viberzi and had an unusual occurrence after 4 days taking it. I became constipated for 1 day & 1/2 when I started having cramps and finally needed to release my bowls. It took 1/2 hr before....it seems like 2 days worth of meat loaf like bowls spilled out all at once. That can't be normal I'm sure but should I continue taking this medication.