My Child Is 8 Months Old.he Was Suffering From Loose

My child is 8 months old.he was suffering from loose motions n fever .doctor has prescribed taxim-o,,crocin,,n zinconia syrup 3 days back.he has no fevrr now..bt from yestrday...he is vomitting when i give him zinconia...plz help his stool colour is dark brown...are still loose bt nt as much loose as were 3 days back..