Exhibit 23.1

Tel:   732-750-0900 Fax:  732-750-1222 www.bdo.com 90 Woodbridge Center Drive
Woodbridge, NJ 07095

Consent of Independent Registered Public Accounting Firm

Eagle Pharmaceuticals, Inc.

Woodcliff Lake, New Jersey

We hereby consent to the incorporation by reference in the Registration Statement on Form S-8 of our reports dated February 26, 2018, relating to the consolidated financial statements, and the effectiveness of Eagle Pharmaceuticals, Inc.’s internal control over financial reporting, which appear in the Company’s Annual Report on Form 10-K for the year ended December 31, 2017.

/s/ BDO USA, LLP

Woodbridge, New Jersey

December 18, 2018

(date of signing consent)

R-221 (6/14)