I took Magnesium Citrate yesterday at 3:20 p.m. Didn't have a bowel movement until 10:00 p.m., then?

... had several bouts of diarrhea all night until 4:00 a.m., then one more bout at 6:00 a.m. Now it is 2:20 p.m. the day after and still having some diarrhea. This doesn't seem normal. Will this stop or might I have something else going on? My Urologist told me to use Magnesium Citrate to relieve my constipation that has been going on for several months.