- Olaparib and PM01183 are metabolized mainly by CYP3A4. Therefore, concomitant use of known strong CYP3A4 inhibitors such as ketokonazole, itraconazole, telithromycin and clarithromycin are forbidden. Concomitant use of known CYP3A4 strong inducers. (See Appendix K for a list of CYP inducers, inhibitors and substrates).