Bullous pemphigoid is a rare complication of frusemide therapy. We pre
sent two patients in whom the link between frusemide and this conditio
n was not recognised early, and continued frusemide therapy resulted i
n prolonged leg blistering and ulceration. On withdrawing the drug, al
l lesions in both patients resolved completely. Although uncommon, thi
s frusemide reaction needs to be borne in mind as it can add to the mo
rbidity of elderly patients with heart failure.