Levofloxacin hydrate (Cravit hydrate) is a broad-spectrum, third-generation fluoroquinolone antibiotic and optically active L-isomer of ofloxacin with antibacterial activity. Levofloxacin diffuses through the bacterial cell wall and acts by inhibiting DNA gyrase (bacterial topoisomerase II), an enzyme required for DNA replication, RNA transcription, and repair of bacterial DNA. Inhibition of DNA gyrase activity leads to blockage of bacterial cell growth.

CH-0793076, a hexacyclic camptothecin analog, is an active drug and major metabolite of TP300. CH-0793076 is efficacious against cells expressing BCRP (breast cancer resistance protein). CH-0793076 inhibits DNA topoisomerase I (IC50: 2.3 μM).

Podocarpusflavone A is a DNA topoisomerase I and STAT3 inhibitor, a flavonoid chemically inactive isolated from the endemic Taiwanese plant, Luo Han Guo, with potential antileishmanial activity and antitumor activity.Podocarpusflavone A, inhibits the cell growth of cutaneous dermal melanoma.

NU2058 (O(6)-Cyclohexylmethylguanine) is a guanine-based CDK inhibitor, also inhibits DNA topoisomerase II ATPase activity.

Ganoderic acid X is a potential Mdm2 inhibitor(K(i) = 16nM). It is a potential anticancer drug, inhibits topoisomerases and induces apoptosis of cancer cells.