If you will be taking this medicine for a long time, it is very important that your doctor check you at regular visits for any problems or unwanted effects that may be caused by this medicine. Blood tests may be needed to check for unwanted effects.
Do not use ranolazine together with carbamazepine (Tegretol®), clarithromycin (Biaxin®), nefazodone (Serzone®), phenobarbital, phenytoin (Dilantin®), rifabutin (Mycobutin®), rifampin (Rifadin®, Rimactane®), rifapentine (Priftin®), medicine to treat fungus infections (eg, itraconazole, ketoconazole, Nizoral®, Sporanox®), medicine to treat HIV or AIDS (eg, indinavir, lopinavir, nelfinavir, ritonavir, saquinavir, Crixivan®, Fortovase®, Invirase®, Norvir®, Viracept®), or St. John's wort.
Do not use this medicine to treat a sudden onset of chest pain.
This medicine can cause a change in the heart rhythm called prolongation of the QT interval. This condition may change the way your heart beats and can cause palpitations or fainting spells. Check with your doctor right away if you start having any of these symptoms.
This medicine may cause acute kidney failure in some patients with severe kidney disease. Check with your doctor right away if you have the following symptoms: agitation, confusion, decreased urine output, depression, dizziness, headache, hostility, irritability, lethargy, muscle twitching, nausea, rapid weight gain, seizures, stupor, swelling of the face, ankles, or hands, or unusual tiredness or weakness.
This medicine may cause some people to become dizzy, lightheaded, drowsy, or less alert than they are normally. Make sure you know how you react to this medicine before you drive, use machines, or do anything else that could be dangerous if you are dizzy or not alert.
Grapefruit and grapefruit juice may increase the effects of ranolazine by increasing the amount of medicine in the body. You should not eat grapefruit or drink grapefruit juice while you are taking this medicine.
Do not take other medicines unless they have been discussed with your doctor. This includes prescription or nonprescription (over-the-counter [OTC]) medicines and herbal or vitamin supplements.