Levofloxacin hydrochloride 是一种广谱的第三代氟喹诺酮类抗生素,是氧氟沙星的光学活性 L-异构体,具有抗菌活性。左氧氟沙星通过细菌细胞壁扩散并通过抑制 DNA 促旋酶(细菌拓扑异构酶 II)起作用,这是一种 DNA 复制、RNA 转录和细菌 DNA 修复所需的酶。 DNA 促旋酶活性的抑制导致细菌细胞生长受阻。
Finafloxacin, a fluoroquinolone antimicrobial agent from a new 8-cyano subclass, is most effective in slightly acidic environments (pH 5.0-6.0), a condition where other fluoroquinolones typically reduce in activity. It selectively targets bacterial type II topoisomerases, such as DNA gyrase and DNA topoisomeraseIV, making it suitable for treating serious bacterial infections particularly in acidic contexts, including urinary tract infections (UTIs) and Helicobacter pylori infections.
Levofloxacin mesylate 是一种口服有效的抗生素,抑制革兰氏阳性和阴性细菌。其作用机制为抑制 DNA 促旋酶 (DNA gyrase) 和拓扑异构酶 IV (topoisomeraseIV)。Levofloxacin mesylate 适用于慢性牙周炎、气道炎症和 BK 病毒血症的研究,并具有抗正痘活性。