Fixed-Dose Combinations: Innovations, Formulation Strategies, and Regulatory Challenges

FDCs (fixed-dose combinations) are used in medicine formulations comprising a single dosage form with two or more active components, offering benefits such as improved patient adherence, reduced pill burden, and modified drug profiles.Key types of FDC formulations include hard capsules, bilayer tablets, multilayer tablets, hot-melt extrusion (HME), and 3D-printed tablets. Hard capsules, such as those containing tamsulosin and dutasteride, offer quick drug release and stability. Bilayer tablets combine immediate and sustained drug release, improving patient convenience, especially in chronic conditions like type 2 diabetes. Multilayer tablets, with controlled release patterns, are used for treating conditions requiring multiple dosing schedules. HME enables targeted and modified drug delivery, while 3Dprinted tablets allow precise, customized dosing. These innovative FDC formulations contribute to enhanced drug efficacy, safety, and patient adherence, highlighting the importance of advanced technologies in modern pharmaceutical development.Approval of Fixed-Dose Combinations (FDCs) requires essential documents like chemical data, therapeutic rationale, and drugdrug interaction lists. In India, Treasury challan fees depend on the active substances' approval duration. Regulatory bodies emphasize safety, efficacy, and consistent drug release, especially for diseases like malaria and HIV/AIDS, avoiding narrow therapeutic index ingredients.