Exhibit 31.1
I, David R. Brennan, certify that:
1 | I have reviewed this Annual Report on Form 10-K/A for the year ended December 31, 2016 of Alexion Pharmaceuticals, Inc.; |
2 | Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report; |
Dated: | March 24, 2017 | /s/ DAVID R. BRENNAN | |
Interim Chief Executive Officer |