The son was prescribed iron supplements, he took malt-fermented drinks…

The son was prescribed iron supplements, he took malt-fermented drinks, but they ran out, nowhere to be found. They got Fersiinol. The son didn't like it, at first he had frequent bowel movements, but not diarrhea, now constipation. He walks around a bit, but very thick and mushy, and he gets uncomfortable, so they even put Microlax in, because he couldn't go. Fersiinol is not being given for two days now. Who has experienced that the iron supplement didn't work, how long did it take for his stool to normalize? I am not giving any strong food right now.