I have read that it potentiates methadone – heart drugs – Tambocor (flecainide), Rythmol (propafenone) – antibiotics – erythromycin, rifampin – anti-seizure drugs – carbamazepine (Tegretol) – antidepressants – St. John’s wort, Zyban/Wellbutrin (bupropion), Paxil (paroxetine), Prozac (fluoxetine), Luvox (fluvoxetine) Serzone (nefazodone), Zoloft (sertraline), Effexor (venlafaxine) – antihistamines – Hismanal (astemizole), Seldane (terfenadine) – antifungals – itraconazole (Sporanox), Ketoconazole (Nizoral) – gastrointestinal motility agents – Prepulsid (Cisapride) – ergot drugs – Ergonovine, Ergomar (ergotamine) – antipsychotics – Clozaril (clozapine), Orap (pimozide) – sedatives/sleeping pills – Ambien (zolpidem), Halcion (triazolam), Versed (midazolam) – lipid-lowering drugs (statins) – Lescol (fluvastatin), Mevacor (lovastatin), Pravachol (pravastatin) and Zocor (simvastatin), Baycol (cerivastatin) – transplant drugs – cyclosporine (Neoral, Sandimmune), ProGraf (tacrolimus), anti-parasite drugs – Mepron (atovaquone) – sedatives/sleeping pills – Ativan (lorazepam) – hormones – estrogen (
http://i-base.info/htb/4667) but be careful about mixing milk thistle and NSAIDs because of the combination can be very bad for the liver. So if your medication includes NSAIDs in combination with your drug (like Percocet which has both Acetaminophen and Oxycodone).