Exhibit 99.1

ENDO
PHARMACEUTICALS
ENDO PHARMACEUTICALS
grow. collaborate. innovate. thrive.
Credit Suisse Healthcare Conference
November 10, 2010

grow. collaborate. innovate. thrive.
FORWARD LOOKING STATEMENTS
This presentation contains forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995 regarding, among other things, the company’s financial position, results of operations, market position, product development and business strategy, as well as estimates of future net sales, future expenses, future net income and future earnings per share. Statements including words such as “believes,” “expects,” “anticipates,” “intends,” “estimates,” “plan,” “will,” “may,” “intend,” “guidance” or similar expressions are forward-looking statements. Because these statements reflect our current views, expectations and beliefs concerning future events, these forward-looking statements involve risks and uncertainties. Investors should note that many factors, as more fully described under the caption “Risk Factors” in Item 1A of our Annual Report on Form 10-K for the year ended December 31, 2009 and Part II, Item 1A of our Quarterly Report on Form 10-Q for the quarter ended September 30, 2010 and as otherwise enumerated herein or therein, could affect our future financial results and could cause our actual results to differ materially from those expressed in forward-looking statements contained in our Annual Report on Form 10-K. Important factors that could cause our actual results to differ materially from the expectations reflected in the forward-looking statements in our Annual Report on Form 10-K include those factors described herein under the caption “Risk Factors” and in documents incorporated by reference, including, among others: our ability to successfully develop, commercialize and market new products; timing and results of pre-clinical or clinical trials on new products; our ability to obtain regulatory approval of any of our pipeline products; competition for the business of our branded and generic products, and in connection with our acquisition of rights to intellectual property assets; market acceptance of our future products; government regulation of the pharmaceutical industry; our dependence on a small number of products; our dependence on outside manufacturers for the manufacture of most of our products; our dependence on third parties to supply raw materials and to provide services for certain core aspects of our business; new regulatory action or lawsuits relating to our use of narcotics in most of our core products; our exposure to product liability claims and product recalls and the possibility that we may not be able to adequately insure ourselves; our ability to protect our proprietary technology; the successful efforts of manufacturers of branded pharmaceuticals to use litigation and legislative and regulatory efforts to limit the use of generics and certain other products; our ability to successfully implement our acquisition and in-licensing strategy; regulatory or other limits on the availability of controlled substances that constitute the active ingredients of some of our products and products in development; the availability of third-party reimbursement for our products; the outcome of any pending or future litigation or claims by third parties or the government, and the performance of indemnitors with respect to claims for which we have the right to be indemnified; our dependence on sales to a limited number of large pharmacy chains and wholesale drug distributors for a large portion of our total revenues; significant litigation expenses to defend or assert patent infringement claims; any interruption or failure by our suppliers, distributors and collaboration partners to meet their obligations pursuant to various agreements with us; a determination by a regulatory agency that we are engaging or have engaged in inappropriate sales or marketing activities, including promoting the “off- label” use of our products; existing suppliers become unavailable or lose their regulatory status as an approved source, causing an inability to obtain required components, raw materials or products on a timely basis or at commercially reasonable prices; the loss of branded product exclusivity periods and related intellectual property.

grow. collaborate. innovate. thrive.
STRONG OPERATING PERFORMANCE
17% 3-YEAR CAGR FOR REVENUE*
Sustaining our Growth
$mm
$2.2B - $ 2.3B
$2,000
$1.63B - $ 1.68B
$1,461
$1,500
$1,261
$1,086
$910
$1,000
$820
$596
$615
$399
$345
$366
$356
$500
$217
$285
$295
$110
$171 $0
2002 2003 2004 2005 2006 2007 2008 2009 2010E 2011E
Revenue Cash Flow from Operations
* Revenue CAGR 2006-2009.
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grow. collaborate. innovate. thrive.
ENDO’S TRANSFORMATION
Through Organic Growth
Diversified business lines to maximize growth
Enhanced commercial model driving growth via strategic resource deployment
Invested in R&D portfolio yielding a diversified pipeline of products with two branded products pending FDA approval
Bolstered management team by adding expertise and experience in managing and growing a larger enterprise
Through Strategic Growth
With Indevus, we secured a position in urology
HealthTronics gave us an established presence in Devices & Services and critical mass in urology
Penwest strengthened our pain business enhancing profitability & flexibility in the opioid franchise
Qualitest brings critical mass to our generics business & strengthens our pain portfolio
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grow. collaborate. innovate. thrive.
ENDO’S INTEGRATED BUSINESS MODEL
Branded Pharmaceuticals
Devices & Services
Generics
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grow. collaborate. innovate. thrive.
STRONG CORE BUSINESS SUPPORTING GROWTH
Frova
Frovatriotan succinate
think
OPANA ER
(oxymorphone HCI)
Extended-release tablets
think
OPANA
(oxymorphone HCI)
Voltaren Gel
(diclofenac sodium topical gel) 1%
Lidoderm
LIDOCAINE PATH 5%
A Custom Fit for PHN Pain
Percocet
(oxycodone and acetaminophen tablets, USP)
VALSTAR
Valrubicin Sterile Solution for Intravesical Instillation
ONCE-YEARLY
SUPPRELIN LA
(histrelin acetate) subcutaneous implant
ONCE-YEARLY
VANTAS
(histrelin implant)
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grow. collaborate. innovate. thrive.
DEVELOPMENT PIPELINE*
Phase I Phase II Phase III NDA
Oxymorphone Pending
Formulation designed to be crush-resistant
FORTESTATM
Pending
2% Testosterone Gel
AVEEDTM
Long Acting Injectable Testosterone Update Pending
UrocidinTM
Bladder Cancer
Octreotide Implant
Acromegaly**
Axomadol
Moderate to moderately severe chronic pain
Octreotide Implant
Carcinoid Syndrome
* There can be no assurance that any of these development programs will be successful or if successful, the products will ultimately be approved by FDA.
** Granted orphan drug designation
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grow. collaborate. innovate. thrive.
LONG-ACTING OPIOID FRANCHISE
Opana ER
Settlement with generic companies provides for 2013 entry on primary dosage forms.
30% TRx growth YOY in Q3 2010
Gaining share; Growing source of cash flow.
Completed Acquisition of Penwest
$0.05 accretive to adjusted diluted EPS in 2010
Advances our leadership and growth in pain management
NDA submission for new formulation of Oxymorphone
Long-acting Oxymorphone designed to be crush-resistant
PDUFA Date of January 7, 2011
think
OPANA ER
(oxymorphone HCI)
Extended-release tablets
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grow. collaborate. innovate. thrive.
HealthTronics
HEALTHTRONICS OVERVIEW
Leading provider of urology services
Leader in lithotripsy, BPH laser and cryosurgery
Emerging urologic businesses in:
Anatomic pathology
Radiation therapy
Unique business relationship with 1/3 of urologists in U.S.
Total solution for the urology marketplace
Improve patient care
Enhance practice economics
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grow. collaborate. innovate. thrive.
QUALITEST PHARMACEUTICALS – A PERFECT STRATEGIC FIT
Furthers strategy to respond to the changing economics that drive the U.S. healthcare environment
Healthcare reform puts a premium on providing cost-effective health solutions
Evolving from a product-driven company to a healthcare solutions provider
Integrated business model
Strengthens Endo’s core pain franchise
Over 40% of Qualitest’s sales come from pain products
In the $15BN pain market, more than 90% of all pain scripts and just less than 50% of sales are being filled by generic drugs
Qualitest strengthens Endo’s ability to provide products at multiple value points
Brings critical mass to generics business
Combined generics business will be the 6th largest U.S. generics manufacturer by prescriptions filled
Focused in categories that have high barriers to entry
Brings a robust ANDA pipeline, seasoned management team & solid assets
By acquiring a high-growth asset, will diversify and boost revenue and earnings’ streams
Advances growth on several metrics
Further diversifies Endo across Branded
Pharmaceuticals, Generic and Devices & Services segments
Combined company has robust number of ANDAs on file and near-term pipeline projects
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grow. collaborate. innovate. thrive.
QUALITEST COMPANY PROFILE
Sixth Largest U.S. Generics Company
A cost competitive producer of products in categories with high barriers to entry (controlled substances, liquids)
175 product families covering multiple therapeutic areas
Strong History of Growth Supported by Robust Future Pipeline
2010E Sales of approximately $350MM, which has grown at a three-year CAGR of 21%
Poised for strong growth with 30 ANDAs under active review, a robust pipeline of ANDAs expected to be filed and new product launches
Seasoned Management Team and High Quality Assets
Team has significant experience running a growing generics business
Four manufacturing/distribution facilities – three in Huntsville, AL and one in Charlotte, NC
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grow. collaborate. innovate. thrive.
A STRONGER GENERICS BUSINESS WITH ROBUST PIPELINE
Qualitest is a High-Growth Asset
Expect revenue to be approx. $350MM in 2010
30 ANDAs under active review by FDA
Expects to file 16 ANDAs in 2011-12
16 products launches in 2011-12
Enhances Endo’s Generics Business
16 ANDAs under active review by FDA
Expects to file 8 ANDAs in 2011-12
9 products launches in 2011-12
Pipeline
50
Qualitest 40 Endo
30 30
20
16
10
16
8
0
Under Active Review Expected Filings in 2011-12
Combined Business has 25 projected launches in 2011-2012
20
Qualitest 16 Endo
12
15
8 1
4 7 2
0
2011 2012
Combined Endo/Qualitest portfolio will grow 15% over 2010-12 period driven by 25 product launches over 2011-12
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grow. collaborate. innovate. thrive.
DIVERSIFICATION OF BUSINESS
2008
Generics
Other Brands
Lidoderm
Pro-forma 2011
Generics
Devices & Services Other Brands
Lidoderm
Lidoderm currently contributes 50% of revenue to the business and following closing, Lidoderm will now represent less than 40%
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grow. collaborate. innovate. thrive.
GROWTH PROSPECTS
Qualitest Business Growth Prospects
Qualitest stand-alone sales expected to grow at a double-digit CAGR over 2010-2012
– 16 product launches expected in 2011-12
Qualitest stand-alone revenue is estimated to be roughly $400MM in 2011
Combined Company Growth Prospects
Pro forma generics sales CAGR of at least 15% over 2010-2012
– 25 product launches expected in 2011-12
Generics revenue is forecast to be more than $500MM for 2011
Consolidated pro forma gross margin of approximately 70% on an adjusted basis
Qualitest EPS accretion on an adjusted basis is approximately $0.40 for first full-year after close
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grow. collaborate. innovate. thrive.
A PERFECT STRATEGIC FIT
Furthers our stated strategy to build a healthcare company better able to respond to the changing economics that drive the U.S. healthcare environment
Adds critical mass to our current generics business, alongside Branded Pharmaceuticals and Devices & Services
As a high-growth asset, will significantly diversify and accelerate the growth of Endo’s revenue and earnings’ streams
Enhances our core pain franchise
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grow. collaborate. innovate. thrive.
2010 ENDO GUIDANCE
Guidance
Revenue range $1.63BN - $1.68BN
Adjusted diluted EPS range $3.30 - $3.35
Reported (GAAP) diluted EPS range $1.91 - $1.99
Expect to generate approximately $400M in annual Operating Cash Flow this year
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grow. collaborate. innovate. thrive.
2011 ENDO GUIDANCE
Guidance
Revenue range $2.2BN - $2.3BN
Adjusted diluted EPS range $4.15 - $4.25
Reported (GAAP) diluted EPS range $2.05 - $2.15
Assumes the close of the Qualitest acquisition by late Q4 2010 or in early 2011
17

ENDO
PHARMACEUTICALS
ENDO PHARMACEUTICALS
grow. collaborate. innovate. thrive.

grow. collaborate. innovate. thrive.
RECONCILIATION OF NON-GAAP MEASURES
For an explanation of Endo’s reasons for using non-GAAP measures, see Endo’s Current Report on Form 8-K filed today with the Securities and Exchange Commission
Reconciliation of Projected GAAP Diluted Earnings Per Share to Adjusted Diluted Earnings Per Share Guidance for the Year Ending December 31, 2010
Lower End of Range Upper End of Range
Projected GAAP diluted income per common share $1.91 $1.99
Upfront and milestone-related payments to partners $0.27 $0.22
Amortization of commercial intangible assets $0.71 $0.71
Costs incurred in connection with continued efforts to enhance the $0.14 $0.14 cost structure of the Company
Indevus related costs and change in fair value of contingent $0.02 $0.02 consideration
Impairment of indefinite-lived intangibles $0.11 $0.11
Costs related to the acquisition of HealthTronics, Inc. $0.19 $0.19
Costs related to the acquisition of Penwest Pharmaceuticals Co. $0.14 $0.14
Costs related to the acquisition of Qualitest Pharmaceuticals $0.03 $0.03
Interest expense adjustment for ASC 470-20 and the amortization of $0.15 $0.15 the premium on debt acquired from Indevus
Tax effect of pre-tax adjustments at the applicable tax rates and ($0.37) ($0.35) certain other expected cash tax savings as a result of the Indevus, HealthTronics, Penwest and Qualitest acquisitions
Diluted adjusted income per common share guidance $3.30 $3.35
The company’s guidance is being issued based on certain assumptions including:
Certain of the above amounts are based on estimates and there can be no assurance that Endo will achieve these results
Includes all completed business development transactions as of November 1, 2010 and the acquisition of Qualitest Pharmaceuticals.
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grow. collaborate. innovate. thrive.
RECONCILIATION OF NON-GAAP MEASURES
For an explanation of Endo’s reasons for using non-GAAP measures, see Endo’s Current Report on Form 8-K filed today with the Securities and Exchange Commission
Reconciliation of Projected GAAP Diluted Earnings Per Share to Adjusted Diluted Earnings Per Share Guidance for the Year Ending December 31, 2011
Lower End of Range Upper End of Range
Projected GAAP diluted income per common share $2.05 $2.15
Upfront and milestone-related payments to partners $0.28 $0.28
Amortization of commercial intangible assets $1.44 $1.44
Costs related to the acquisition of HealthTronics, Inc. $0.03 $0.03
Costs related to the acquisition of Penwest Pharmaceuticals Co. $0.02 $0.02
Costs related to the acquisition of Qualitest Pharmaceuticals $0.51 $0.51
Interest expense adjustment for ASC 470-20 and the amortization of $0.16 $0.16 the premium on debt acquired from Indevus
Tax effect of pre-tax adjustments at the applicable tax rates and ($0.34) ($0.34) certain other expected cash tax savings as a result of the Indevus, HealthTronics, Penwest and Qualitest acquisitions
Diluted adjusted income per common share guidance $4.15 $4.25
The company’s guidance is being issued based on certain assumptions including:
Certain of the above amounts are based on estimates and there can be no assurance that Endo will achieve these results
Includes all completed business development transactions as of November 1, 2010 and the acquisition of Qualitest Pharmaceuticals.
20

ENDO
PHARMACEUTICALS
ENDO PHARMACEUTICALS
grow. collaborate. innovate. thrive.
Credit Suisse Healthcare Conference
November 10, 2010