Drug Interaction Report

RifAMPin may significantly reduce the blood levels of infigratinib, 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.

Infigratinib should be taken on an empty stomach, at least 1 hour before or 2 hours after food. Do not consume grapefruit, grapefruit juice, or any supplements that contain grapefruit extract during treatment with infigratinib unless directed otherwise by your doctor. Grapefruit juice can increase the blood levels of infigratinib. This may increase the frequency and severity of serious side effects such as infections; decreased red blood cell, white blood cell, and platelet counts; fever; abdominal pain; increased blood calcium and phosphate levels above normal; eye and vision problems; mouth sores and inflammation; diarrhea; redness, swelling, peeling or tenderness, mainly on the hands and feet ('hand-foot syndrome'); nails separating from the bed or poor formation of the nail; and changes in kidney function blood tests. Talk to your doctor if you have any questions or concerns. 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.