Table 1. Notable azathioprine-related fatalities and serious ADRs reported to the UK Medicines Control Agency from 1 July 1963 until 19 May 2006.

Adverse event	Reported events	Reported fatalities
(A) All causes	1030	110
(B) Leading serious adverse events associated with fatalities
Pancytopenia	55	3
Thrombocytopenia	32	2
Leucopenia	24	2
Bone marrow depression	24	2
Agranulocytosis	16	2
Aplastic anemia	14	5
Sepsis	11	4
Granulocytopenia	8	1
Hepatic failure	5	5
Febrile neutropenia	2	1