Doctors in Memphis have reported using intravenous zanamivir (Relenza), which is not approved by the FDA, to successfully treat a critically ill 10-year-old girl with acute lymphoblastic leukemia who had oseltamivir (Tamiflu)-resistant pandemic H1N1 influenza.
http://www.medpagetoday.com/InfectiousDisease/SwineFlu/17674