Via Facsimile and U.S. Mail Mail Stop 6010 July 2, 2005 Mr. G. Kelly Martin President & Chief Executive Officer Elan Corporation, PLC 875 Third Avenue, Floor 3 New York, NY 10022 Re:	Elan Corporation, PLC 		Form 20-F for Fiscal Year Ended December 31, 2004 	 Filed April 11, 2005 		File No. 1-13896 Dear Mr. Martin: We have limited our review of your filing to those issues we have addressed in our comments. In our comments, we ask you to provide us with information so we may better understand your disclosure. After reviewing this information, we may or may not raise additional comments. 	Please understand that the purpose of our review process is to assist you in your compliance with the applicable disclosure requirements and to enhance the overall disclosure in your filing. We look forward to working with you in these respects. We welcome any questions you may have about our comments or on any other aspect of our review. Feel free to call us at the telephone numbers listed at the end of this letter. Form 20-F for the year ended December 31, 2004 Critical Accounting Policies, page 31 Revenue- Discounts, Sales Returns, Rebates and Chargebacks 1. We believe that your disclosure related to estimates of items that reduce gross revenue such as product returns, chargebacks, customer rebates and other discounts and allowances could be improved. Please provide us the following information, in disclosure-type format, to help us evaluate the adequacy of your disclosure: a) The nature and amount of each accrual at the balance sheet date and the effect that could result from using other reasonably likely assumptions than what you used to arrive at each accrual such as a range of reasonably likely amounts or other type of sensitivity analysis. b) The factors that you consider in estimating each accrual such as historical return of products, levels of inventory in the distribution channel, estimated remaining shelf life, price changes from competitors and introductions of generics and/or new products. c) To the extent that information you consider in b) is quantifiable, disclose both quantitative and qualitative information and discuss to what extent information is from external sources (e.g., end- customer prescription demand, third-party market research data comparing wholesaler inventory levels to end-customer demand). For example, in discussing your estimate of product that may be returned, consider disclosing and discussing, preferably by product and in tabular format, the total amount of product (in sales dollars) that could be potentially be returned as of the balance sheet date and disaggregated by expiration period. d) If applicable, discuss any shipments made as a result of incentives and/or in excess of your customer`s ordinary course of business inventory level. Discuss your revenue recognition policy for such shipments. e) A roll forward of the accrual for each estimate for each period presented showing the following: * Beginning balance, * Current provision related to sales made in current period, * Current provision related to sales made in prior periods, * Actual returns or credits in current period related to sales made in current period, * Actual returns or credits in current period related to sales made in prior periods, and * Ending balance. f) Regarding your discussion of results of operations for the period to period revenue comparisons, discuss the amount of and reason for fluctuations for each type of reduction of gross revenue (i.e. product returns, chargebacks, customer rebates and other discounts and allowances) including the effect that changes in your estimates of these items had on your revenues and operations. Note 21. Discontinued Operations, Sales of Businesses, and Held for Sale Assets and Liabilities, page 105 2. It appears that individual drugs are included in discontinued operations. Demonstrate to us how each product, product group or business included in discontinued operations meets the definition of an asset group in paragraph 4 of FAS 144. Fully explain how cash flows of each asset group are identifiable and independent of the cash flows of other groups of assets. Also explain how you were able to determine cost of sales, selling, general and administrative expenses and research and development expenses directly attributable to each drug or product group presented as discontinued operations. Note 31. Segment Information 3. We noted your disclosure on page 36 with regards to product revenues. Please tell us why you have not provided the disclosures required by paragraph 37 of FAS 131 here in the audited financial statements. * * * * Please provide us the supplemental information requested within 10 business days of the date of this letter or tell us when you will provide a response prior to the expiration of the 10-day period. Please furnish a letter with your supplemental responses that keys your response to our comments. Please file your letter on EDGAR under the form type label CORRESP. 	We urge all persons who are responsible for the accuracy and adequacy of the disclosure in the filing to be certain that the filing includes all information required under the Securities Exchange Act of 1934 and that they have provided all information investors require for an informed investment decision. Since the company and its management are in possession of all facts relating to a company`s disclosure, they are responsible for the accuracy and adequacy of the disclosures they have made. 	In connection with responding to our comments, please provide, in writing, a statement from the company acknowledging that: * the company is responsible for the adequacy and accuracy of the disclosure in the filing; * staff comments or changes to disclosure in response to staff comments do not foreclose the Commission from taking any action with respect to the filing; and * the company may not assert staff comments as a defense in any proceeding initiated by the Commission or any person under the federal securities laws of the United States. In addition, please be advised that the Division of Enforcement has access to all information you provide to the staff of the Division of Corporation Finance in our review of your filing or in response to our comments on your filing. You may contact Sasha Parikh, Staff Accountant, at (202) 551- 3627 or Lisa Vanjoske, Assistant Chief Accountant, at (202) 551- 3614 if you have questions regarding the comments. In this regard, do not hesitate to contact me at (202) 551-3679. 							Sincerely, 							Jim B. Rosenberg 							Senior Assistant Chief Accountant ?? ?? ?? ?? G. Kelly Martin Elan Corporation, PLC June 22, 2005 Page 4