EXHIBIT 23.3 [Letterhead of PricewaterhouseCoopers] CONSENT OF INDEPENDENT ACCOUNTANTS We hereby consent to the incorporation by reference in the Registration Statement on Form S-8 (File Nos. 333-09168 and 333-93543) of Shire Pharmaceuticals Group plc of our report dated February 5, 1998, which appears in this Form 10-K. /s/ PricewaterhouseCoopers LLP Florham Park, New Jersey March 29, 2000