EXHIBIT 23 CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM We hereby consent to the incorporation by reference in the Registration Statement on Form S-8 (No. 333-73053) of King Pharmaceuticals, Inc. of our report dated June 14, 2005 relating to the financial statements of the King Pharmaceuticals, Inc. 401(k) Retirement Savings Plan, which appears in this Form 11-K. PricewaterhouseCoopers LLP Raleigh, NC June 27, 2005