Exhibit 99.1

Company Contact:
Mark Donohue
Sr. Director
Investor Relations and Corporate Communications
(215) 933-3526
www.impaxlabs.com

Impax Laboratories Reports Growth in Revenue,
Profit and Earnings in the Third Quarter 2010

HAYWARD, Calif. (November 2, 2010) — Impax Laboratories, Inc. (NASDAQ: IPXL) today reported adjusted net revenue in the third quarter of 2010, excluding the effect of a change in accounting for revenue received under the Company’s Strategic Alliance Agreement with Teva, increased $42.6 million to $107.6 million compared to the prior year period, driven by sales of generic Adderall XR^® for which there were no sales in the third quarter of 2009, as well as increased sales of the Company’s fenofibrate products. Earnings before interest, taxes, depreciation and amortization (EBITDA) for the third quarter of 2010, excluding adjusted items, increased $12.2 million to $27.8 million, compared to $15.6 million in the prior year period. Net income for the third quarter 2010, excluding adjusted items, increased to $15.8 million, or $0.24 per diluted share, compared to $9.0 million, or $0.15 per diluted share, in the prior year period. On a generally accepted accounting principles (GAAP) basis, net revenue in the third quarter of 2010 increased $239.0 million to $304.0 million due to the change in revenue recognition, and net income increased to $75.2 million, or $1.15 per diluted share, compared to $6.7 million, or $0.11 per diluted share in the prior year period.

In July 2010, the Company materially modified its Strategic Alliance Agreement with Teva and applied the revised revenue recognition standards of FASB ASC 605-25 Multiple Element Arrangements. Application of the revised standards resulted in the recognition in the third quarter of 2010 of previously deferred net revenue of $196.4 million that would have been recognized over the remaining life of the Teva agreement under the prior standards. This had the effect of increasing third quarter net revenue by $196.4 million, net income by $61.4 million and net income per diluted share by $0.98. Please refer to the attached information and footnotes on pages 9 and 10 for a further description and reconciliation of adjusted items.

“Our positive third quarter results continued to reflect demand for our generic Adderall XR^® and fenofibrate products. However, on-going supply issues of generic Adderall XR^® with our supplier Shire Laboratories continued to constrain our ability to fill strong customer demand leading to lower than expected sales and market share. Following numerous attempts to resolve the recent and recurring supply issues, we have initiated litigation alleging breach of contract and other related claims due to Shire’s failure to fill our orders for product.” said Larry Hsu, Ph.D., president and CEO, Impax Laboratories.

Dr. Hsu continued, “With our strong balance sheet consisting of more than $358 million in cash and short-term investments and no debt, we continue to aggressively pursue generic and brand opportunities to acquire products, technologies or companies with compelling business strategies to drive near and long term growth. We also remain excited with the continued development of our late-stage product IPX066 for Parkinson’s disease patients. We recently completed the APEX-PD Phase III study in naïve patients and expect to release the top line results later this year. Enrollment in the ADVANCED-PD Phase III study was completed in late August and we look forward to the completion of this study in early 2011, with data release in the second quarter of 2011. We continue to progress toward filing the new drug application in the fourth quarter of 2011.”

Segment Information

The Company has two reportable segments, the Global Pharmaceuticals Division (generic products) and the Impax Pharmaceuticals Division (brand products) and does not allocate general corporate services to either segment.

Global Pharmaceuticals Division Information

		Three Months Ended								Nine Months Ended
		September 30								September 30,
(Unaudited; amounts in thousands)		2010				2009				2010				2009
Revenues:
Global Product sales, net		$	91,051			$	46,636			$	537,794			$	123,144
Private Label			528				1,752				1,539				5,269
Rx Partner (a)			202,800				8,328				213,504				30,183
OTC Partner			2,365				1,769				6,439				5,255
Research Partner			3,384				2,962				10,153				8,406
Other			—				—				—				11
Total Revenues (a)			300,128				61,447				769,429				172,268
Cost of revenues (a)			140,279				25,098				282,309				72,339
Gross profit (a)			159,849				36,349				487,120				99,929
Operating expenses:
Research and development			12,819				8,909				32,608				28,761
Patent litigation			1,033				1,647				4,786				4,058
Selling, general and administrative			4,127				2,561				11,149				7,628
Total operating expenses			17,979				13,117				48,543				40,447
Income from operations (a)		$	141,870			$	23,232			$	438,577			$	59,482

		Three Months Ended												Nine Months Ended
		September 30, 2010												September 30, 2010
(Unaudited; amounts in thousands)		As Reported				Impact of change				Adjusted				As Reported				Impact of change				Adjusted
Rx Partner		$	202,800			$	196,440			$	6,360			$	213,504			$	196,440			$	17,064
Total Revenues			300,128				196,440				103,688				769,429				196,440				572,989
Cost of revenues			140,279				95,426				44,853				282,309				95,426				186,883
Gross profit			159,849				101,014				58,835				487,120				101,014				386,106
Income from operations		$	141,870			$	101,014			$	40,856			$	438,577			$	101,014			$	337,563

Excluding the change in revenue recognition under the Teva Agreement, Global Pharmaceuticals Division revenues increased $42.2 million to $103.7 million, driven by a significant increase in Global Product sales, net, as discussed below.

During the third quarter of 2010, Global Product sales, net, increased $44.4 million to $91.1 million over the same period in 2009 primarily due to sales of generic Adderall XR^® and, to a lesser extent, increased sales of the Company’s fenofibrate products. Partially offsetting these gains was a $2.0 million decline in Rx Partner revenue (before the change in revenue recognition) and a $1.2 million decline in Private Label revenue. The decline in Rx Partner revenue is primarily attributable to reduced sales of generic Wellbutrin^® products as competition continues to erode the Company’s market share, while Private Label product sales declined due to lower demand for the Company’s generic loratadine/PSE products.

Excluding the change in revenue recognition, gross profit increased $22.5 million to $58.8 million primarily due to sales of generic Adderall XR^® and an increase in fenofibrate sales. Adjusted gross profit margin of 57% for the third quarter 2010 declined from the 59% margin for the prior year period due to the slightly higher concentration of lower-margin products.

Research and development expenses for the third quarter of 2010 increased $3.9 million to $12.8 million, compared to the prior year primarily due to higher spending on bioequivalency studies, active pharmaceutical ingredients and compensation expenses.

Selling, general and administrative expenses for the third quarter of 2010 increased $1.6 million to $4.1 million due to increased marketing expenses, sales incentives and customer freight, all related to higher sales levels as noted above.

Excluding the change in revenue recognition, Global Pharmaceuticals Division income from operations in the third quarter of 2010 increased $22.9 million to $40.9 million, compared to $17.7 million in the prior year, due to the increase in sales as noted above.

Impax Pharmaceuticals Division Information

		Three Months Ended								Nine Months Ended
		September 30,								September 30,
(Unaudited; amounts in thousands)		2010				2009				2010				2009
Revenues:
Promotional Partner		$	3,535			$	3,499			$	10,538			$	10,007
Research Partner			330				—				440				—
Total revenues			3,865				3,499				10,978				10,007
Cost of revenues			2,843				2,957				9,280				9,250
Gross profit			1,022				542				1,698				757
Operating expenses:
Research and development			11,027				6,334				30,656				17,983
Selling, general and administrative			930				761				2,478				2,528
Total operating expenses			11,957				7,095				33,134				20,511
Loss from operations		$	(10,935	)		$	(6,553	)		$	(31,436	)		$	(19,754	)

Impax Pharmaceuticals Division revenues in the third quarter of 2010 were $3.9 million, a slight increase over the prior year due primarily to the addition of Research Partner revenue related to a Development and Co-Promotion Agreement with Endo Pharmaceuticals which was entered into in June 2010.

The Company is currently investing in research and development to develop brand products which provide longer product life cycles and the potential for significantly higher profit margins than generic products. In the third quarter of 2010, research and development expense increased $4.7 million to $11.0 million, primarily due to planned increased spending on clinical studies for the Company’s leading drug candidate for Parkinson’s disease.

The Company’s planned increase in investment in research and development during the third quarter of 2010 contributed to an Impax Pharmaceuticals Division loss from operations of $10.9 million compared to a loss from operations of $6.6 million in the third quarter of 2009.

Corporate and Other Information

		Three Months Ended								Nine Months Ended
(Unaudited; amounts in thousands)		September 30,								September 30,
		2010				2009				2010				2009
Litigation settlement		$	—			$	818			$	—			$	1,674
General and administrative			7,575				5,698				23,509				19,770
Total operating expenses			7,575				6,516				23,509				21,444
Loss from operations		$	(7,575	)		$	(6,516	)		$	(23,509	)		$	(21,444	)

Total corporate operating expenses for the third quarter of 2010 increased $1.1 million to $7.6 million, due to increased compensation, higher insurance costs related to increasing levels of business activity and an increase in systems implementation expenses.

Cash and Short-Term Investments

Cash and short-term investments were $358.4 million as of September 30, 2010, as compared to $90.4 million as of December 31, 2009. The change in cash and short-term investments from year-end 2009 is due to strong year to date product sales.

2010 Financial Outlook

The Company previously updated its full year 2010 forecast on August 3, 2010. The Company provides this further update to its full year 2010 forecast.

•

Cash flows from operating activities, before changes in working capital, less capital expenditures (Free Cash Flow), planned to be positive.

•

Updated May 2010 — gross margins as a percent of total revenues to approximate 50% for the balance of the year.

•

Updated November 2010 — Total research and development expenses across the generic and brand divisions to approximate $85 million with generic R&D to approximate $43 million (an increase of $2 million due to increased purchases of active pharmaceutical ingredients) and brand R&D to approximate $42 million.

•

Updated November 2010 — Patent litigation expenses of approximately $8 million (a decrease of approximately $3 million due to delayed spending on litigation).

•

Selling, general and administrative expenses of approximately $50 million.

•

Updated May 2010 — estimated consolidated effective tax rate of approximately 40% (without renewal in 2010 of the federal R&D tax credit).

•

Capital expenditures expected to be approximately $20 million.

Conference Call Information

The Company will host a conference call today at 11:00 a.m. EDT to discuss its results. The number to call from within the United States is (877) 719-9796 and (719) 325-4778 internationally. The call can also be accessed via a live Webcast through the Investor Relations section of the Company’s Web site, www.impaxlabs.com. A replay of the conference call will be available shortly after the call for a period of seven days. To access the replay, dial (888) 203-1112 (in the U.S.) and (719) 457-0820 (international callers). The access conference code is 7669744.

About Impax Laboratories, Inc.

Impax Laboratories, Inc. is a technology based specialty pharmaceutical company applying its formulation expertise and drug delivery technology to the development of controlled-release and specialty generics in addition to the development of branded products. Impax markets its generic products through its Global Pharmaceuticals Division and markets third-party branded products through the Impax Pharmaceuticals Division. Additionally, where strategically appropriate, Impax has developed marketing partnerships to fully leverage its technology platform. Impax Laboratories is headquartered in Hayward, California, and has a full range of capabilities in its Hayward, Philadelphia and Taiwan facilities. For more information, please visit the Company’s Web site at: www.impaxlabs.com.

“Safe Harbor” statement under the Private Securities Litigation Reform Act of 1995:

To the extent any statements made in this news release contain information that is not historical, these statements are forward-looking in nature and express the beliefs and expectations of management. Such statements are based on current expectations and involve a number of known and unknown risks and uncertainties that could cause the Company’s future results, performance or achievements to differ significantly from the results, performance or achievements expressed or implied by such forward-looking statements. Such risks and uncertainties include, but are not limited to, the effect of current economic conditions on the Company’s industry, business, financial position, results of operations and market value of its common stock, the ability to maintain an effective system of internal control over financial reporting, fluctuations in revenues and operating income, reductions or loss of business with any significant customer, the impact of competitive pricing and products and regulatory actions on the Company’s products, the ability to sustain profitability and positive cash flows, the ability to maintain sufficient capital to fund operations, any delays or unanticipated expenses in connection with the operation of the Taiwan facility, the ability to successfully develop and commercialize pharmaceutical products, the uncertainty of patent litigation, consumer acceptance and demand for new pharmaceutical products, the difficulty of predicting Food and Drug Administration filings and approvals, the inexperience of the Company in conducting clinical trials and submitting new drug applications, reliance on key alliance, collaboration, license and distribution agreements, the availability of raw materials, the ability to comply with legal and regulatory requirements governing the healthcare industry, the regulatory environment, exposure to product liability claims and other risks described in the Company’s periodic reports filed with the Securities and Exchange Commission. Forward-looking statements speak only as to the date on which they are made, and Impax undertakes no obligation to update publicly or revise any forward-looking statement, regardless of whether new information becomes available, future developments occur or otherwise.

Impax Laboratories, Inc.

(Unaudited; amounts in thousands, except share and per share data)

		Three Months Ended								Nine Months Ended
		September 30,								September 30,
		2010				2009				2010				2009
Revenues:
Global Pharmaceuticals Division (a)		$	300,128			$	61,447			$	769,429			$	172,268
Impax Pharmaceuticals Division			3,865				3,499				10,978				10,007
Total Revenues			303,993				64,946				780,407				182,275
Cost of revenues (b)			143,122				28,055				291,589				81,589
Gross profit (c)			160,871				36,891				488,818				100,686
Operating expenses:
Research and development			23,846				15,243				63,264				46,744
Patent litigation			1,033				1,647				4,786				4,058
Litigation settlement			—				818				—				1,674
Selling, general and administrative			12,632				9,020				37,136				29,926
Total operating expenses			37,511				26,728				105,186				82,402
Income from operations (c)			123,360				10,163				383,632				18,284
Other (expense) income, net			(91	)			(6	)			(134	)			52
Interest income			405				180				680				636
Interest expense			(38	)			(185	)			(108	)			(735	)
Income before income taxes			123,636				10,152				384,070				18,237
Provision for income taxes			48,501				3,495				146,114				6,373
Net income before noncontrolling interest			75,135				6,657				237,956				11,864
Add back loss attributable to noncontrolling interest			28				28				40				53
Net Income (d)		$	75,163			$	6,685			$	237,996			$	11,917
Net Income per share: (d)
Basic		$	1.20			$	0.11			$	3.85			$	0.20
Diluted		$	1.15			$	0.11			$	3.65			$	0.20
Weighted average common shares outstanding:
Basic			62,435,116				60,559,064				61,778,465				60,130,608
Diluted			65,470,341				61,247,700				65,171,055				60,667,227

Impax Laboratories, Inc.

		September 30,				December 31,
		2010				2009
		(unaudited)
ASSETS
Current assets:
Cash and cash equivalents		$	165,772			$	31,770
Short-term investments			192,579				58,599
Accounts receivable, net			95,567				185,854
Inventory, net			42,036				49,130
Current portion of deferred product manufacturing costs-alliance agreements			3,006				11,624
Current portion of deferred income taxes			37,114				32,286
Prepaid expenses and other current assets			2,958				4,748
Total current assets			539,032				374,011
Property, plant and equipment, net			103,066				101,650
Deferred product manufacturing costs-alliance agreements			8,231				96,619
Deferred income taxes, net			1,396				48,544
Other assets			25,587				12,358
Goodwill			27,574				27,574
Total assets		$	704,886			$	660,756
Liabilities and Stockholders Equity
Current liabilities:
Accounts payable		$	19,156			$	23,295
Accrued expenses			82,083				62,055
Accrued income taxes payable			32,942				31,627
Accrued profit sharing and royalty expenses			15,235				53,695
Current portion of deferred revenue-alliance agreements			19,438				33,196
Total current liabilities			168,854				203,868
Deferred revenue-alliance agreements			36,773				224,522
Other liabilities			13,645				10,139
Total liabilities		$	219,272			$	438,529
Total stockholders equity			485,614				222,227
Total liabilities and stockholders equity		$	704,886			$	660,756

Impax Laboratories, Inc.

		Nine Months Ended September 30,
		2010				2009
Cash flows from operating activities:
Net income		$	237,996			$	11,917
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation			9,066				7,806
Amortization of Wachovia 3.5% Debentures discount and deferred financing costs			—				301
Amortization of Credit Agreement deferred financing costs			25				50
Bad debt expense			215				131
Deferred income taxes (benefit)			46,657				(9,430	)
Provision for uncertain tax positions			35				695
Tax benefit related to the exercise of employee stock options			(4,337	)			—
Deferred revenue-Alliance Agreements			22,947				36,388
Deferred product manufacturing costs-Alliance Agreements			(9,739	)			(20,853	)
Deferred revenue recognized-Alliance Agreements			(224,454	)			(43,844	)
Amortization deferred product manufacturing costs-Alliance Agreements			106,746				29,750
Accrued profit sharing and royalty expense			86,985				523
Profit sharing and royalty payments			(125,445	)			(455	)
Payments on exclusivity period fee			—				(6,000	)
Payments on accrued litigation settlements			(5,865	)			(8,037	)
Share-based compensation expense			7,706				5,179
Accretion of interest income on short-term investments			(374	)			(424	)
Changes in assets and liabilities:
Accounts receivable			90,072				(18,368	)
Inventory			7,094				(6,606	)
Prepaid expenses and other assets			(11,225	)			1,346
Accounts payable, accrued expenses and income taxes payable			22,349				14,824
Other liabilities			3,431				2,740
Net cash provided by (used in) operating activities		$	259,885			$	(2,367	)
Cash flows from investing activities:
Purchase of short-term investments			(306,784	)			(49,563	)
Maturities of short-term investments			173,178				47,748
Purchases of property, plant and equipment			(10,541	)			(8,405	)
Net cash (used in) investing activities		$	(144,147	)		$	(10,220	)
Cash flows from financing activities:
Repayment of long-term debt			—				(12,887	)
Tax benefit related to the exercise of employee stock options			4,337				—
Proceeds from exercise of stock options and purchases under the ESPP			13,927				3,776
Net cash provided by (used in) financing activities		$	18,264			$	(9,111	)
Net increase (decrease) in cash and cash equivalents		$	134,002			$	(21,698	)
Cash and cash equivalents, beginning of period		$	31,770			$	69,275
Cash and cash equivalents, end of period		$	165,772			$	47,577

Impax Laboratories, Inc.
Non-GAAP Financial Measures

Total revenues, net income, EBITDA and earnings per share excluding adjusted items are not measures of financial performance under generally accepted accounting principles (“GAAP”) and should not be construed as substitutes for, or superior to, consolidated total revenues, net income and earnings per share as a measure of financial performance. However, management uses both GAAP financial measures and the disclosed non-GAAP financial measures internally to evaluate and manage the Company’s operations and to better understand its business. Further, management believes the inclusion of non-GAAP financial measures provides meaningful supplementary information to and facilitates analysis by investors in evaluating the Company’s financial performance, results of operations and trends. The Company’s calculation of total revenues, net income, EBITDA and earnings per share excluding certain adjusted items may not be comparable to similarly designated measures reported by other companies, since companies and investors may differ as to what type of events warrant adjustment.

The following table provides a summary of GAAP and adjusted results for the three and nine months ended September 30, 2010 and 2009.

		Three Months Ended								Nine Months Ended
(Unaudited)		September 30,								September 30,
(amounts in thousands, except per share data)		2010				2009				2010				2009
GAAP results:
Total revenues		$	303,993			$	64,946			$	780,407			$	182,275
Net income		$	75,163			$	6,685			$	237,996			$	11,917
Net income per diluted share		$	1.15			$	0.11			$	3.65			$	0.20
Adjusted results:
Total revenues (1)		$	107,553			$	64,946			$	583,967			$	182,275
Net income		$	15,823			$	9,008			$	183,089			$	17,733
Net income per diluted share		$	0.24			$	0.15			$	2.81			$	0.29

The following tables reconcile reported results to net income adjusted for after-tax items for the three and nine months ended September 30, 2010 and 2009.

		Three months ended								Nine months ended
(Unaudited)		September 30,								September 30,
(in millions, except per share amounts)		2010				2009				2010				2009
Net income		$	75.2			$	6.7			$	238.0			$	11.9
Adjusted to add (deduct):
Change in revenue recognition (1)			(101.0	)							(101.0	)
Antitrust litigation settlement (2)							0.8								1.7
Share-based compensation			2.5				2.0				7.7				5.2
Income tax effect			39.2				(0.5	)			38.4				(1.0	)
Adjusted net income		$	15.8			$	9.0			$	183.1			$	17.7
Adjusted net income per diluted share		$	0.24			$	0.15			$	2.81			$	0.29

Please refer to the attached footnotes on page 10 for a more detailed description of adjusted items.

Impax Laboratories, Inc.
Non-GAAP Financial Measures

The following tables reconcile reported results to adjusted EBITDA for the three and nine months ended September 30, 2010 and 2009.

		Three months ended								Nine months ended
		September 30,								September 30,
(Unaudited; amounts in millions)		2010				2009				2010				2009
Net income		$	75.2			$	6.7			$	238.0			$	11.9
Adjusted to add (deduct):
Other (income) expense, net			0.0				0.0				0.1				(0.1	)
Interest income			(0.4	)			(0.2	)			(0.7	)			(0.6	)
Interest expense			0.0				0.2				0.1				0.7
Depreciation and amortization			3.0				2.6				9.1				8.2
Income taxes			48.5				3.5				146.1				6.4
Noncontrolling interest			(0.0	)			(0.0	)			(0.0	)			(0.1	)
EBITDA			127.2				12.8				392.7				26.4
Adjusted to add (deduct):
Change in revenue recognition (1)			(101.0	)							(101.0	)
Antitrust litigation settlement (2)							0.8								1.7
Share-based compensation			2.5				2.0				7.7				5.2
Adjusted EBITDA		$	27.8			$	15.6			$	299.4			$	33.3

(1) Material Modification to Teva Agreement

In July 2010, the Company entered into a material modification of its Strategic Alliance Agreement with Teva, and as a result the Company will apply the revised accounting standards of FASB ASC 605-25 Multiple Element Arrangements (“ASC 605-25”) which became effective for agreements entered into or materially modified on or after June 15, 2010, to its recognition of revenue under the Teva Agreement. The Company applied the accounting principles of ASC 605-25 on a prospective basis beginning in the quarter ended September 30, 2010. For the three months and nine months ended September 30, 2010, the application of ASC 605-25 resulted in recognition in the quarter ended September 30, 2010 of previously deferred revenue and related costs, with the effect of increasing RX Partner revenue by $196.4 million and increasing Cost of revenues by $95.4 million. Basic earnings per share increased by approximately $0.98 and $0.99 for the three and nine months ended September 30, 2010, respectively, as a result of the prospective application of ASC 605-25.

(2) Litigation settlement

In January 2010, the Company entered into an agreement to settle a lawsuit related to its previously marketed Lipram UL products. Under the terms of the litigation settlement agreement, the Company agreed to reimburse the plaintiff for certain litigation costs, which was paid by the Company in January 2010. The Company recorded an accrued expense for this payment in the year ended December 31, 2009. In the three and nine months ended September 30, 2009 the Company recorded litigation settlement expense of $0.8 million and $1.7 million, respectively, which included legal and other professional fees incurred by the Company in its defense against the lawsuit.