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The U.S. Food and Drug Administration last week indicated that it has strengthened the warnings on a pair of blood cancer drugs because of an increased problem with hepatitis B reactivation.
The drugs in question are:
The FDA will add a black box warning to the drugs, illuminating the already-known risk that these drugs can cause reactivation of the hepatitis B virus in any person previously infected with it. Despite the fact that the warning is included in the label, patients with a history of hepatitis infection are being given the drug and some have died on account of it.
Doctors are being strongly urged to screen all patients for hepatitis B infection prior to administering or prescribing either drug, as both will suppress the immune system and make the body vulnerable to reactivation, illness and possibly death.