Endo Pharmaceuticals Inc. & Algos Pharmaceutical Corporation November/December 1999 Agenda o Background on Endo Pharmaceuticals and Algos Pharmaceutical o Strategic Rationale o Endo's Strengths o Algos' Strengths o Terms of Merger Endo Pharmaceuticals Inc. A Pharmaceuticals Company formed in August 1997 to: o Be an innovative, therapeutically-focused pharmaceuticals company with a strong presence in acute and chronic pain management o Market and develop branded pain products o Be recognized for its ability to supply high-quality, innovative products to the marketplace Endo's Marketing Strategy for Existing Brands o Capitalize on strong brand equity inherent in each product o Revitalize existing brands through increased marketing directly to prescription writers o Focus on promotionally sensitive products which have not been marketed in many years preparing market for future products o Build Franchise - line extensions, novel new technology and new chemical entities Algos Pharmaceutical Corporation o A specialty pharmaceutical company with a focus on pain management o Develop and commercialize proprietary technology, in an attempt to improve the efficacy, side-effect profile and duration of action of existing, FDA-approved compounds o Multiple late-stage products in clinical trials - Lead product, MorphiDex(R), once approved by the FDA, will compete in the $1 billion strong opioid segment of the US pain management market Strategic Rationale o Combined Company will be a US leader in Pain Management with brand equity and novel proprietary technology - Leading franchise with critical mass o Marriage of established specialty pharmaceutical Company with a broad technology development Company o Significant growth potential through: - Existing marketed products - Newly launched branded products - Pipeline of late stage development products o Diversification of clinical development risk - Creates a publicly-held company with immediate positive cash flow Strategic Rationale o Focus on large, fast-growing Pain Management markets - Multiple, billion-dollar target markets o Accelerated market penetration of Algos' patented technology through existing Endo sales force - Leverages Endo's existing distribution capabilities with a broader product portfolio o Potential to maximize OxycoDex(TM) sales through Percocet(R) brand Strategic Rationale o Complementary strengths: - Management team - Product formulation and manufacturing - Existing sales force - Distribution network - Clinical development - Regulatory Corporate Philosophy of Combined Company o Sales and marketing driven culture o Focused, effective research and development o Flexible cost structure Pain Management: Key Drivers of Market Growth o Demographics o Increase in number of surgical procedures o Changing attitudes towards pain management o Introduction of new forms of pain medications Endo's Strengths o Established business and focused strategy in Pain Management with strong brand equity - 1998 Revenue of $108.4 million o 1999 launch of new brands including Percocet(R) 2.5, 7.5 and 10.0 mg, Lidoderm(R) and Zydone(R) 5.0, 7.5 and 10.0 mg o Substantial growth opportunities exist in R&D pipeline o Efficient and flexible operating structure Endo's Strengths o High operating margins and steady cash flow generated by Endo's core products including Percocet(R), Lidoderm(R) and Zydone(R) o Experienced and entrepreneurial management team o Long-term competitive manufacturing agreement Algos' Strengths o Focused strategy in Pain Management o Patented combinations of approved drugs that more effectively manage pain o Six patented products in late stage clinical development - 4 pain products - 2 addiction treatment products o Blue chip collaboration partner (J&J) o Experienced and entrepreneurial management team Combined Product Portfolio Moderate Moderately Severe Severe - --------------------------------------------------------------------------------------------> Established Brands: Nubain(R) Percocet(R) 5.0,Percodan(R), Percolone(R) Numorphan(R) New Marketed Brands: Percocet(R) 2.5 Percocet(R)7.5 Percocet(R) 10 Zydone(R) 5 Zydone(R) 7.5 Zydone(R) 10 Lidoderm(R) Late Stage Development: HydrocoDex(TM) OxycoDex(TM) MorphiDex(R) EN3222 EN3212 Numorphan(R) IR and CR NeuroDex(TM) Early Stage Development: LidoDexIED(TM) EN3215 EN3216 LidoDexNS(TM) Terms of Merger o Tax-free stock for stock purchase transaction with uninterrupted public trading o 80% (Endo)/20% (Algos) ownership at closing - Opportunity for Algos to increase its ownership to 35%, through the exercise of warrants, if FDA approval for MorphiDex(R) received by December 31, 2001 - Algos' ownership will increase by an additional 5% if Endo (excluding Algos-related revenue and expenses) does not achieve a specified gross profit target for fiscal year 2000 - Warrant to Endo for an additional 5% ownership if MorphiDex(R) approval not obtained by December 31, 2002 o Carol A. Ammon named President and CEO and John W. Lyle named Chairman of the Board o OxycoDex(TM) collaboration agreement