Exhibit 23(a)
CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM
We hereby consent to the incorporation by reference in this Registration Statement on FormS-3 of our report dated February 27, 2018 relating to the financial statements and the effectiveness of internal control over financial reporting, which appears in Merck & Co., Inc.’s Annual Report onForm 10-K for the year ended December 31, 2017. We also consent to the reference to us under the heading “Experts” in such Registration Statement.
/s/ PricewaterhouseCoopers LLP |
Florham Park, NJ |
March 29, 2018 |