About cefdinirsemisynthetic (third generation ) cephalosporin antibiotic, oral broad-spectrum antibiotic.mechanism of action cefdinir is a 3rd generation cephalosporin which exerts its bactericidal action against both gram positive & aerobic gram negative organisms by inhibiting bacterial cell wall synthesis. cefdinir inhibits transpeptidase & thus prevents cross linking of bacterial cell wall. transpeptidase & associated proteins constitute various types of specific binding proteins which have affinity for cephalosporins like cefdinirindications for cefdinir1.pneumonia 2.bronchitis 3.pharyngitis 4.tonsillitis 5.skin & soft tissue infections 6.otitismedia 7.sinusitis