- Planned ongoing administration of STRONG cytochrome P450, family 3, subfamily A, polypeptide 4 (CYP3A4) inducers. Examples of clinical inducers and classifications of strong, moderate, and weak interactions are available through the FDA website (Table 3-3 of website): http://www.fda.gov/Drugs/DevelopmentApprovalProcess/DevelopmentResources/DrugInteracti onsLabeling/ucm093664.htm