Arena Pharmaceuticals, Inc.
Oct 25, 2006

Arena Pharmaceuticals Announces Third Quarter 2006 Financial Results

SAN DIEGO, Oct. 25 /PRNewswire-FirstCall/ -- Arena Pharmaceuticals, Inc. (Nasdaq: ARNA) today reported financial results for the third quarter and nine months ended September 30, 2006.

Total revenues in the third quarter of 2006 were $4.4 million, compared to $7.4 million in the third quarter of 2005. Total revenues in the first nine months of 2006 were $25.9 million, compared to $17.4 million in the first nine months of 2005. Arena reported a net loss allocable to common stockholders in the third quarter of 2006 of $20.1 million, or $0.43 per share, and a net loss allocable to common stockholders in the first nine months of 2006 of $51.9 million, or $1.14 per share. This compares with a net loss allocable to common stockholders in the third quarter of 2005 of $16.1 million, or $0.46 per share, and a net loss allocable to common stockholders in the first nine months of 2005 of $57.5 million, or $1.69 per share.

"In the third quarter Arena reached a very important corporate milestone by initiating the Phase 3 trial to evaluate lorcaserin for the treatment of obesity, remaining on track to file an NDA in 2009," stated Jack Lief, Arena's President and Chief Executive Officer. "We are also continuing to work towards initiation of the Phase 2 trial of APD125 for insomnia and the Phase 1 trial of APD791, an anti-platelet compound in preclinical development for the prevention and treatment of arterial thrombo-embolic diseases. Arena remains focused on expanding and advancing our pipeline of novel medicines and building value for our stockholders. Multiple events are anticipated in the coming year, including APD125 Phase 2 and APD791 Phase 1 data, the month six DSMB review for lorcaserin, the continuation and expansion of the lorcaserin pivotal program, and additional visibility on our partnerships with Merck and Ortho-McNeil."

Research and development expenses totaled $22.7 million in the third quarter of 2006, compared to $20.9 million in the third quarter of 2005. Research and development expenses totaled $65.3 million in the first nine months of 2006, compared to $58.9 million in the first nine months of 2005. The increase in research and development expenses in 2006 as compared to 2005 is primarily attributable to an increase in the number of research and development personnel. Research and development expenses in the first nine months of 2006 included $2.2 million in non-cash, stock-based compensation expense. General and administrative expenses totaled $3.9 million in the third quarter of 2006, compared to $2.6 million in the third quarter of 2005. General and administrative expenses totaled $13.2 million in the first nine months of 2006, compared to $8.4 million in the first nine months of 2005. The increase in general and administrative expenses in 2006 as compared to 2005 is primarily attributable to costs related to Arena's growing and maturing patent portfolio, as well as an increase in general and administrative personnel. Total patent costs, including patent costs related to partnered programs, were $3.4 million in the first nine months of 2006, compared to $1.3 million in the first nine months of 2005. To the extent Arena's collaborators are obligated to reimburse Arena for such costs, the reimbursements are classified as revenues. Arena recorded $1.9 million in patent reimbursement costs from its collaborators in the first nine months of 2006. General and administrative expenses in the first nine months of 2006 also included $1.6 million in non-cash, stock-based compensation expense.

Cash, cash equivalents and short-term investments totaled $250.8 million at September 30, 2006, and included net proceeds to the company of approximately $169.0 million from a follow-on stock offering completed in February 2006 as well as $9.0 million from milestones achieved in 2006. Approximately 47.4 million shares of common stock were outstanding at September 30, 2006.

Arena's Third Quarter Highlights

Updated Financial Guidance for 2006

Arena also announced an update to its financial guidance for 2006. Arena now expects to end 2006 with approximately $213 to $220 million in cash, cash equivalents and short-term investments compared to the $192 to $202 million previously guided. The increase in cash, cash equivalents and short-term investments is primarily due to a decrease in expected expenditures for external preclinical and clinical study fees and expenses to $48 to $50 million as compared to the $63 to $65 million previously guided.

Arena expects to spend approximately $62 to $64 million in internal research and development for all of 2006 (which includes $3.6 million in non-cash share-based compensation) compared to the $57 to $59 million previously guided, with the increase in expenditures primarily related to increased staff to support its research and development programs. Arena expects general and administrative expenses for all of 2006 to total $17 to $19 million (which includes $2.6 million in non-cash share-based compensation) compared to the $18.5 to $20.5 million previously guided, with the decrease a result of less patent expenses than previously planned on its partnered and internal programs.

Based on timing of expected milestones from its partners, Merck and Ortho-McNeil, Arena revised its revenues guidance for all of 2006 to $29 to $31 million from the previous guidance of $34 to $38 million.

Accordingly, Arena now expects net cash usage for all of 2006 of approximately $77 to $83 million for its operating activities and approximately $12 to $13 million in net cash usage for capital expenditures. Previous guidance was for net cash usage of approximately $89 to $93 million for its operating activities and approximately $9 to $13 million in net cash usage for capital expenditures.

Intellectual Property Update

In the third quarter Arena was issued patent number 7,108,991, entitled "HUMAN ORPHAN G PROTEIN-COUPLED RECEPTORS," by the United States Patent and Trademark Office. The patent relates to certain drug screening methods utilizing the Glucose-Dependent Insulinotropic Receptor, or GDIR. The invention set forth in the patent was utilized to identify the orally bioavailable compounds that Ortho-McNeil and Arena are developing to treat diabetes as part of their partnership initiated in December 2004.

Scheduled Earnings Call

Arena will host both a conference call and webcast to discuss the third quarter 2006 financial results, and to provide a corporate update today, Wednesday, October 25, 2006, at 5:00 p.m. Eastern Time (2:00 p.m. Pacific Time). Jack Lief, President and Chief Executive Officer and Robert E. Hoffman, Vice President, Finance and Chief Financial Officer will host the conference call.

The conference call may be accessed by dialing 800.573.4842 for domestic callers and 617.224.4327 for international callers. Please specify to the operator that you would like to join the "Arena Third Quarter 2006 Earnings Call." The conference call will be webcast live under the investor relations section of Arena's website at www.arenapharm.com, and will be archived there for 30 days following the call. Please connect to Arena's website several minutes prior to the start of the broadcast to ensure adequate time for any software download that may be necessary.

Upcoming Corporate Presentations

Arena is currently scheduled to present at the following investment and industry conferences through December 2006:

About Arena Pharmaceuticals

Arena is a clinical-stage biopharmaceutical company focused on discovering, developing and commercializing oral drugs in four major therapeutic areas: cardiovascular, central nervous system, inflammatory, and metabolic diseases. Arena's most advanced product candidate, lorcaserin, is being investigated in a Phase 3 clinical trial program for the treatment of obesity. Arena's broad pipeline of novel compounds targeting G protein-coupled receptors, an important class of validated drug targets, includes compounds being evaluated for serious diseases and disorders independently and with our partners, Merck & Co., Inc. and Ortho-McNeil Pharmaceutical, Inc.

Arena Pharmaceuticals® and Arena® are registered service marks of the company. CART is an unregistered service mark of the company. "APD" is an abbreviation for Arena Pharmaceuticals Development.

Forward-Looking Statements

Certain statements in this press release are forward-looking statements that involve a number of risks and uncertainties. Such forward-looking statements include statements about the importance of the initiation of the Phase 3 BLOOM trial of lorcaserin, the expected clinical trials and studies and results thereof of lorcaserin, including about the timing and filing of the related NDA, APD125, and APD791, including about the expected timing and design of such trials and studies and activities thereunder, the month six DSMB review for lorcaserin, the expected expansion, advancement and content of Arena's pipeline, the building of value for Arena's stockholders, Arena's collaborations with Merck and Ortho-McNeil, including expected activities thereunder, the tolerability, side effects, efficacy and potential, including possible commercialization, of Arena's product candidates and compounds, financial guidance, and other statements about Arena's strategy, patent portfolio, technologies, preclinical and internal and partnered clinical programs, and ability to develop compounds and commercialize drugs. For such statements, Arena claims the protection of the Private Securities Litigation Reform Act of 1995. Actual events or results may differ materially from Arena's expectations. Factors that could cause actual results to differ materially from the forward-looking statements include, but are not limited to, Arena's planned clinical trials may not proceed at the time Arena expects or at all, the results of preclinical studies or clinical trials may not be predictive of future results, Arena's ability to partner lorcaserin, APD125 or other of its compounds or programs, the timing, success and cost of Arena's research, out-licensing endeavors and clinical trials, Arena's ability to obtain additional financing, Arena's ability to obtain and defend its patents, and the timing and receipt of payments and fees, if any, from Arena's collaborators. Additional factors that could cause actual results to differ materially from those stated or implied by Arena's forward-looking statements are disclosed in Arena's filings with the Securities and Exchange Commission. These forward-looking statements represent Arena's judgment as of the time of this release. Arena disclaims any intent or obligation to update these forward-looking statements, other than as may be required under applicable law.



Arena Pharmaceuticals, Inc. Condensed Consolidated Statements of Operations (In thousands, except per share amounts)

Three months ended Nine months ended September 30, September 30, 2006 2005 2006 2005 (unaudited) (unaudited) Revenues Total revenues $4,416 $7,432 $25,870 $17,357

Expenses Research and development 22,727 20,855 65,293 58,923 General and administrative 3,900 2,612 13,238 8,399 Amortization of acquired technology 385 385 1,153 1,153 Total expenses 27,012 23,852 79,684 68,475

Interest and other income, net 2,972 782 3,455 2,287

Net loss (19,624) (15,638) (50,359) (48,831) Dividends on redeemable convertible preferred stock (514) (494) (1,511) (1,313) Accretion of discount related to redeemable convertible preferred stock -- -- -- (7,372) Net loss allocable to common stockholders $(20,138) $(16,132) $(51,870) $(57,516)

Net loss per share, basic and diluted $(0.43) $(0.46) $(1.14) $(1.69)

Shares used in calculating net loss per share, basic and diluted 47,242 35,241 45,620 34,065



Condensed Consolidated Balance Sheet Data (In thousands)

September 30, December 31, 2006 2005 (unaudited) (Note)

Assets Cash, cash equivalents and short-term investments $250,812 $127,939 Accounts receivable 1,540 848 Other current assets 9,762 5,721 Land, property and equipment, net 55,538 49,639 Acquired technology, investments and other assets 13,578 13,982 Total assets $331,230 $198,129 Liabilities and Stockholders' Equity Deferred revenues $16,874 $24,144 Other liabilities 27,783 24,668 Redeemable convertible preferred stock 51,288 49,777 Stockholders' equity 235,285 99,540 Total liabilities and stockholders' equity $331,230 $198,129

Note: The Condensed Consolidated Balance Sheet Data has been derived from the audited financial statements as of that date.

SOURCE Arena Pharmaceuticals, Inc.

CONTACT: Jack Lief, President and CEO, or David Walsey, Director, Corporate Communications, both of Arena Pharmaceuticals, Inc., +1-858-453-7200, ext. 1682; or Media Relations, Carolyn Wang of WeissComm Partners, +1-415-946-1065, for Arena Pharmaceuticals, Inc.
Web site: http://www.arenapharm.com