- Abbott Laboratories
- Acurian
- Alcon
- Altana Nycomed
- Amgen
- Ascend Therapeutics
- Astellas
- Astra Zeneca
- Aventis
- Aviron
- Balance
- Barr Research
- Bayer
- Becton Dickinson
- Boehringer Ingelheim
- Bristol-Myers Squibb
- Chiltern
- Clin Trials Research, Inc.
- Clinimetrics
- Concepts in Pharmaceutical Research
- Covalent Group
- Covance
- Depomed
- Duramed
- Eisai
- Eli Lilly
- Essential
- Ethicon
- Galen Pharmaceutical
- Gilead Sciences
- GlaxoSmithKline
- Glaxo Wellcome
- Hoechst Marion Roussel
- Hoffman LaRoche
- Hormos
- ICON
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- IDEA
- INC Research
- Indevus
- Johnson & Johnson
- Kendle
- Knoll
- KV Pharmaceutical
- LBR Regulatory
- Lederle Praxis
- McNeil
- MDS
- Mead Johnson
- Medpace
- MedImmune
- Merck & Co.
- Neurocrine
- NicOx
- Novartis
- Novo Nordisk
- Omnicare
- Organon
- Ortho McNeil
- Otsuka
- Paragon
- Parexel
- Parke Davis
- Pediamed
- Pfizer
- Pharmacia
- Pharmacia and Upjohn
- PPD Development
- PRA
- Proctor and Gamble
- Protocare Development
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- Purdue Pharma L.P. Searle
- Quatrx
- Quintiles
- Reliant
- Replidyne
- Repros Therapeutics
- Rhone Poulenc Rorer
- Roche
- Sanofi-Aventis
- Sanofi Pasteur
- Sanofi-Synthelabo
- Schering Plough
- Schwarz
- Sciele Pharma
- Scirex
- Searle
- Senju
- Sepracor
- SmithKlineBeecham
- Solvay
- Statprobe
- StressGen Biotechnologies
- Takeda
- TAP
- Tapp Holding
- TEVA
- The Phoenix
- Third Wave
- 3M
- Upjohn & Co.
- ViroPharma
- Warner Chilcott
- Watson
- Wyeth
- Wyeth-Ayerst
- Xanodyne
- Z-Tech
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