http://www.medications.com/effect/view/21719 I also was prescribed Macrobid for a UTI and after six days of it I too began itching and had hives and then was hospitalized for 3 days due to the reaction. Sat, 15 Sep 2007 17:38:45 -0400 http://www.medications.com/effect/view/21719?item=1815 I too took Macrobid for 3 days only and didn't have the reaction while taking it. However, when stopping the last pill two days later I broke out into severe hives!! It has been almost three weeks and I still have the hives from this medication and have be http://www.medications.com/effect/view/21719?item=1815