Schering-Plough Corporation and Subsidiaries Subsidiaries of Registrant As of December 31, 1996 Exhibit 21 Subsidiaries of Registrant or Organization Name/State or Country of Incorporation AESCA Chemisch Pharmazeutische Fabrik GmbH Austria American Image Productions, Inc. Tennessee American Scientific Laboratories, Inc. Delaware Beneficiadora e Industrializadora S.A. de C.V. Mexico Canji, Inc. Delaware Chemibiotic (Ireland) Limited Ireland Dashtag United Kingdom Desarrollos Farmaceuticos Y Cosmeticos S.A. Spain DNAX Research Institute of Molecular & Cellular Biology, Inc. California Douglas Industries, Inc. Delaware Dr. Scholl's Foot Comfort Shops, Inc. Delaware Essex Chemie A.G. Switzerland Essex Farmaceutica S. A. Colombia Essex Italia S.p.A. Italy Essex Pharma GmbH Germany Essexfarm S. A. (Ecuador) Ecuador Farmaceutica Essex, S. A. Spain Garden Insurance Co., Ltd. Bermuda Integrated Disease Management, Inc. Delaware Integrated Therapeutics Group, Inc. Delaware Key Pharma, A. G. Switzerland Key Pharma, S.A. Spain Key Pharmaceuticals Export Co., Inc. U.S. Virgin Islands Key Pharmaceuticals, Inc. Florida Kirby Medical Products Cia Ltda Chile Kirby-Warrick Pharmaceuticals Limited United Kingdom Laboratorio Essex, C.A. Venezuela Laboratorio S.P. White's, C.A. Venezuela Laboratorios Essex S.A. Argentina Loftus Bryan Chemicals Limited Ireland Med-Nim (Proprietary) Limited South Africa P.T. Schering-Plough Indonesia Indonesia Pharmaceutical Supply Corporation Delaware Pharmaco(Canada) Ltd. Canada Pharmaco, Inc. Delaware Plough (Australia) Pty. Limited Australia Plough (UK) Limited United Kingdom Plough Benelux S.A. Belgium Plough Broadcasting Co., Inc. Delaware Plough Consumer Products (Asia) Ltd. Hong Kong Plough Consumer Products (Philippines) Inc. Philippines Plough de Venezuela, C.A. Venezuela Plough Export, Inc. Tennessee Plough Farma, Lda. Portugal Plough France S.A. France Plough Hellas Limited Greece Plough Laboratories, Inc. Tennessee Plough S.p.A. Italy Plough Services AG Switzerland PPL, Inc. Tennessee Pro Medica AB Sweden Professional Pharmaceutical Corporation Delaware Professional Vaccine Corporation Delaware S-P RIL Limited United Kingdom Scheramex S.A. de C.V. Mexico Scherico, Ltd. Switzerland Schering Canada Inc. Canada Schering Corporation New Jersey Schering Institutional Sales Corporation Delaware Schering Laboratories Advertising Inc. Delaware Schering Plough South Korea Schering Sales Corporation Delaware Schering Transamerica Corporation New Jersey Schering-Plough France Schering-Plough (Grenada) Limited Grenada Schering-Plough (Proprietary) Limited South Africa Schering-Plough A/S Denmark Schering-Plough A/S Norway Schering-Plough AB Sweden Schering-Plough Animal-Health Corporation Delaware Schering-Plough B.V. Netherlands Schering-Plough C.A. Venezuela Schering-Plough Central East A.G. Switzerland Schering-Plough China, Ltd. Bermuda Schering-Plough Compania Limitada Chile Schering-Plough Coordination Center N.V./S.A. Belgium Schering-Plough Corp., U.S.A. Delaware Schering-Plough Corporation Philippines Schering-Plough del Caribe, Inc. New Jersey Schering-Plough del Ecuador, S.A. Ecuador Schering-Plough Farma Lda. Portugal Schering-Plough Farmaceutica Ltda. Brazil Schering-Plough HealthCare Holding Co. Delaware Schering-Plough HealthCare Products Advertising Corp. Tennessee Schering-Plough HealthCare Products Canada, Inc. Canada Schering-Plough HealthCare Products Sales Corporation California Schering-Plough HealthCare Products, Inc. Delaware Schering-Plough Holdings Ltd. United Kingdom Schering-Plough INT Limited United Kingdom Schering-Plough International, Inc. Delaware Schering-Plough Investment Company, Inc. Delaware Schering-Plough Investments Limited Delaware Schering-Plough Kabushiki Kaisha Japan Schering-Plough Labo N.V. Belgium Schering-Plough Limited Iran Schering-Plough Limited Taiwan Schering-Plough Limited Thailand Schering-Plough Limited United Kingdom Schering-Plough Ltd. Switzerland Schering-Plough N.V./S.A. Belgium Schering-Plough Overseas Limited Delaware Schering-Plough OY Finland Schering-Plough Pharmaceutical Industrial and Commercial S.A. Greece Schering-Plough Products, Inc. Delaware Schering-Plough Pty. Limited Australia Schering-Plough Real Estate Company, Inc. Delaware Schering-Plough Research Institute Delaware Schering-Plough S.A. Argentina Schering-Plough S.A. Colombia Schering-Plough S.A. Panama Schering-Plough S.A. Spain Schering-Plough S.A. Uruguay Schering-Plough S.A. de C.V. Mexico Schering-Plough S.p.A. Italy Schering-Plough Sante Animale France Schering-Plough Sdn. Bhd. Malaysia Schering-Plough Tibbi Urunler Ticaret, A.S. Turkey Sentipharm A.G. Switzerland Sentipharm Hong Kong Ltd. Hong Kong Shanghai Schering-Plough Pharmaceutical Company, Ltd. China SOL Limited Bermuda SP Biotech, S.A. Spain SP HealthCare Products Corp. Delaware SP Neurotech, S.A. Spain Suntan Sensations, Inc. California Technobiotic Limited Australia The Coppertone Corporation Florida W-J Liquidating Corp. Delaware W-J Manufacturing Corporation Delaware Warrick Pharmaceuticals Corporation Delaware Warrick Pharmaceuticals Limited United Kingdom Werthenstein Chemie A.G. Switzerland White Laboratories Ltd. United Kingdom White Laboratories of Canada Limited Canada White Laboratories, Inc. New Jersey