Hello forum posters -- the following is from a question my friend and I were talking about last night: "Have any of you heard about a new study that has found a drug-drug interaction between tamoxifen and ropinirole? We have an insurance company that claims there is an interaction and won't allow the two to be filled together." I searched through pharmacy sources and only came up with how the drug works. CYP2D6 inhibitors: May increase the levels/effects of tamoxifen. Example inhibitors include chlorpromazine, delavirdine, fluoxetine, miconazole, paroxetine, pergolide, quinidine, quinine, ritonavir, and ropinirole. Does anyone have any idea of a d-d interaction? Any help will be appreciated, thank you!