Pharmaceutical products formulated with more than one drug, typically referred to as combination products, are intended to meet previously unmet patients need by combining the therapeutic effects of two or more drugs in one product. These combination products can present daunting challenges to the analytical chemist responsible for the development and validation of analytical methods. This presentation will discuss the development and validation of analytical method Spectrophotometric and High performance liquid chromatography (HPLC), for drug products containing more than one active ingredient. This book deals with various approaches applied for the development and validation of analytical method for paracetamol and pamabrom.