110  Vinca alkaloids (e. g. vincristine and vinblastine) (used in treating cancer)  Indinavir and other HIV protease inhibitors (used for treating HIV)  Non-nucleoside reverse transcriptase inhibitors (e. g. efavirenz, delavirdine, nevirapine) (used for treating HIV)  Methadone (used to treat heroin addiction)  Efavirenz (used for treating HIV) (some doses of efavirenz can NOT be taken at the same time as VFEND)  Alfentanil and other short acting opiates such as fentanyl and sufentanil (painkillers used for surgical procedures)  Non-steroidal anti-inflammatory drugs (e. g. ibuprofen, diclofenac) (used for treating pain and inflammation)