Drug Interaction Report

RifAMPin may reduce the blood levels of selumetinib, which may make the medication less effective in treating your condition. Talk to your doctor if you have any questions or concerns. Your doctor may be able to prescribe alternatives that do not interact. It is important to tell your doctor about all other medications you use, including vitamins and herbs. Do not stop using any medications without first talking to your doctor.

Grapefruit juice can increase the blood levels of selumetinib. This may increase the risk and/or severity of serious side effects such as diarrhea; colitis (inflammation of the colon); skin rashes; cardiomyopathy (a condition that affects the heart muscle and its ability to pump blood); rhabdomyolysis (a rare condition involving the breakdown of skeletal muscle tissue that can cause kidney damage and death); and eye problems that can lead to blindness. Do not consume grapefruit, grapefruit juice, or any supplements that contain grapefruit extract during treatment with selumetinib. Talk to your doctor or pharmacist if you have any questions or concerns. You should seek prompt medical attention if you experience severe diarrhea; severe skin reactions (rash over a large area of the body, peeling skin, blisters); signs and symptoms of heart trouble (persistent coughing or wheezing, shortness of breath, swelling of ankles and feet, fatigue, increased heart rate); muscle problems (unexplained muscle pain, tenderness or weakness, especially with fever and/or dark colored urine); or vision problems (blurred vision, light sensitivity, dark spots or floaters, vision loss). It is important to tell your doctor about all other medications you use, including vitamins and herbs. Do not stop using any medications without first talking to your doctor.

Food can decrease the levels of rifAMPin in your body. Taking rifAMPin on an empty stomach (at least 30 minutes before or 2 hours after a meal) will make it easier for your body to absorb the medication. Avoid drinking alcohol while taking rifAMPin because alcohol use may increase the risk of damage to your liver. It is important to seek immediate medical care if you experience any severe side effects or symptoms of liver damage such as fever, chills, joint pain or swelling, unusual bleeding or bruising, skin rash, itching, loss of appetite, fatigue, nausea, vomiting, dark colored urine, and/or yellowing of the skin or eyes. It is important to tell your doctor about all other medications you use, including vitamins and herbs. Do not stop using any medications without first talking to your doctor.