Ritonavir tablets can interact with other medicines and cause serious and life-threatening side effects and adverse events. It is important to know the medicines that should not be taken with ritonavir tablets. Do not take ritonavir tablets if you or your child take any of the following medicines: alfuzosin (UROXATRAL®); amiodarone (CORDARONE®, NEXTERONE®, PACERONE®); cisapride (PROPULSID®, PROPULSID QUICKSOLV®); colchicine (COLCRYS®, COL-PROBENECID®, Probenecid and Colchicine and others); dronedarone (MULTAQ®); ergot-containing medicines, including: dihydroergotamine (D.H.E. 45®, MIGRANAL®), ergotamine tartrate (CAFERGOT®, MIGEROT®, ERGOSTAT®, MEDIHALER ERGOTAMINE®, WIGRAINE®, WIGRETTES®), methylergonovine maleate (ERGOTRATE®, METHERGINE®); flecainide (TAMBOCOR®); lovastatin (ADVICOR®, ALTOPREV®, MEVACOR®); lurasidone (LATUDA®); midazolam, when taken by mouth; pimozide (ORAP®); propafenone (RYTHMOL®); quinidine (NUEDEXTA®, QUINAGLUTE®, CARDIOQUIN®, QUINIDEX® and others); ranolazine (RANEXA®); sildenafil (REVATIO®), only when used for treating the lung problem, pulmonary arterial hypertension (PAH); simvastatin (SIMCOR®, VYTORIN®, ZOCOR®); St. John’s Wort (Hypericum perforatum) or a product that contains St. John’s Wort; triazolam (HALCION®) or voriconazole (VFEND®) if your ritonavir tablets dose is 400 mg every 12 hours or greater. Serious problems can happen if you or your child takes any of these medicines with ritonavir tablets. Please see the Important Safety Information below and the full Prescribing Information for ritonavir tablets for complete product information including contraindications, warnings, precautions and adverse reactions.