SKU: O039

Price: make selection(s)

Ofloxacin HCl is a synthetic, broad-spectrum, second-generation fluoroquinolone antibiotic. It is an analog of nalidixic acid. Ofloxacin HCl inhibits the supercoiling activity of bacterial DNA gyrase, halting DNA replication. Ofloaxacin was developed by Daiichi Seiyaku.

    CAS Number


    Molecular Formula

    C18H20FN3O4 • HCl

    Molecular Weight


    Mechanism of Action

    Ofloxacin HCl is a Cytochrome P-450 inhibitor, a DNA Topoisomerase II inhibitor. Fluoroquinolone antibiotics target bacterial DNA gyrase, an enzyme which reduces DNA strain during replication. Because DNA gyrase is required during DNA replication, subsequent DNA synthesis and ultimately cell division is inhibited.

    Storage Conditions


    Tariff Code



    Ofloxacin is a broad-spectrum antibiotic targeting a wide range of Gram-positive and Gram-negative organisms.


    Cancer Applications

    Oflaxacin had an inhibitory effect on the proliferation of transitional cell carcinoma cell lines at high concentrations (>200 ╬╝g/ml). The effect may be related to impairment of telomerase activity by some unknown mechanism (Yamakuchi M et al, 1997). Ofloxacin inhibite proliferation and DNA synthesis of these 3 human TCC lines (CCSUP, T24, and J82 ) in vitro. Inhibition occurred in a concentration- and time-dependent manner. Inhibition of proliferation and DNA synthesis were assessed via MTT and tritiated thymidine assays.

    Microbiology Applications

    Ofloxacin is commonly used in clinical in vitro microbiological antimicrobial susceptibility tests (panels, discs, and MIC strips) against Gram- positive and Gram-negative microbial isolates. Medical microbiologists use AST results to recommend antibiotic treatment options. Representative MIC values include: Haemophilus influenzae 0.016 µg/mL – 0.063 µg/mL Escherichia coli 0.063 µg/mL – 0.125 µg/mL For a complete list of Ofloxacin MIC values, click here.





    Off-white crystalline powder





    Mouton Y and Leroy O (1991) Ofloxacin. Int. J. Antimicrob. Agents 1(2-3):57-74 Seay TM, Peretsman SJ and DIxon PS (1996) Inhibition of human transitional cell carcinoma in vitro proliferation by fluoroquinolone antibiotics. J. Urol. 2:757-762 PMID 8558720 Smith JT (1991) Ofloxacin, a bactericidal antibacterial. Chemother. 37 (supp 1):2-13 PMID 1646700 Yamakuchi M, Nakata M, Kawahara K, Kawahara K, Kitajima I and Maruyama I (1997) New quinolones, ofloxacin and levofloxacin, inhibit telomerase activity in transitional cell carcinoma cell lines. Cancer Lett. 119(2):213-219 PMID 9570374

Other Items In This Category