<p>The mechanism of Silver Sulfadiazine&#39;s antibacterial action has not been fully elucidated. After exposure to the drug, structural changes in the bacterial cell membrane occur, including distortion and enlargement of the cell and a weakening of the cell wall membrane. This is accompanied by reduced viability in sensitive strains. The silver sulfadiazine molecule dissociates and the silver moiety is bound to the bacterial cells. It is believed that, after penetrating the cell wall, the silver moiety is attached to deoxyribonucleic acid (DNA) and prevents bacterial cell proliferation. There is approximately 100 times more DNA in mammalian cells than in bacterial cells. It is thought that the ratio of silver sulfadiazine to bacterial DNA is sufficiently high to prevent bacterial division but the corresponding ratio to epithelial DNA is low enough not to block epithelial cell regeneration. The sulfadiazine moiety also provides a bacteriostatic action against sensitive organisms. In adults, up to 10% of the sulfadiazine may be absorbed and 60 to 85% of the absorbed amount is excreted in the urine. In children with 13% body surface area burns, the urinary sulfadiazine concentration was 31.8 mg/L.</p>