Bone Care International: Announces Receipt of Notice of Patent Allowance

FOR IMMEDIATE RELEASE

Patent for Stabilized Hydroxyvitamin D2 Products Covers Hectorol® (doxercalciferol)

Middleton WI, December 9, 2004 – Bone Care International, Inc. (Nasdaq: BCII) announced today it has received a notice of allowance from the U.S. Patent and Trademark Office for claims relating to stabilized hydroxyvitamin D2 products and pharmaceutical compositions and medicaments including stabilized hydroxyvitamin D2. The stabilized hydroxyvitamin D2 product for which a patent will be granted is characterized by a purity profile and level of impurities and residual solvents. Hectorol®, Bone Care’s novel vitamin D hormone therapy to treat secondary hyperparathyroidism in patients with moderate to severe chronic kidney disease and end-stage renal disease, is covered by this new composition of matter patent that will expire in 2021.

Mr. Paul Berns, President and Chief Executive Officer, Bone Care International stated, “This patent will be an important addition to our intellectual property portfolio. We currently have patent coverage for methods of treating and preventing hyperparathyroidism using a vitamin D analog. Our commercial product used in those methods is Hectorol® and this new patent on stabilized hydroxyvitamin D2 products will significantly deepen our Hectorol®-related patent portfolio and extend the protected time horizon.”

Bone Care International (www.bonecare.com) is a specialty pharmaceutical company engaged in the discovery, development and commercialization of innovative therapeutic products to treat the unmet medical needs of patients with debilitating conditions and life-threatening diseases. Our current commercial and therapeutic focus is in nephrology, utilizing Hectorol®, a novel vitamin D hormone therapy, to treat secondary hyperparathyroidism in patients with moderate to severe chronic kidney disease and end-stage renal disease. In addition to chronic kidney disease, the Company is developing vitamin D hormone therapies to treat hyperproliferative disorders such as cancer and psoriasis.

Contact
Bone Care International, Inc.
Brian J. Hayden
Chief Financial officer
608-662-7800

This press release contains forward-looking statements. Statements relating to future sales, costs of sales, other expenses, profitability, financial resources, or products and production schedules, or statements that predict or indicate future events and trends and which do not relate solely to historical matters identify forward-looking statements. Forward-looking statements are made pursuant to the safe harbor provisions of Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934 and are based on management’s beliefs as well as assumptions made by and information currently available to management. Accordingly, the Company’s actual results may differ materially from those expressed or implied in such forward-looking statements due to known and unknown risks and uncertainties that exist in the Company’s operations and business environment, including, among other factors, the ability of the Company and each of its suppliers of doxercalciferol, Hectorol® Injection and Hectorol® Capsules to meet the Company’s anticipated production schedules, technical risks associated with the development of new products, regulatory policies in the United States and other countries, risks associated with our ability to avoid or minimize delays in/or interruption of the manufacture and supply of our products, including the approvals of regulatory authorities in connection therewith, reimbursement policies of public and private health care payors, introduction and acceptance of new drug therapies, competition from existing products and from new products or technologies, the failure by the Company to produce anticipated cost savings or improve productivity, the timing and magnitude of capital expenditures and acquisitions, currency exchange risks, economic and market conditions in the United States, Europe and the rest of the world, and other risks associated with the Company’s operations. The Company disclaims any obligation to update any such factors or to publicly announce any revisions to any of the forward-looking statements contained herein to reflect future events or developments.