Drug Interactions between fexinidazole and infigratinib

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 enhance the levels of fexinidazole in your body. To ensure maximal oral absorption, fexinidazole should be administered with or immediately after the main meal of the day. This will make it easier for your body to absorb the medication. Use of herbal medicines and supplements during treatment with fexinidazole should be avoided. Grapefruit or grapefruit juice should not be consumed during treatment with fexinidazole. Grapefruit juice can significantly increase the blood levels and effects of fexinidazole, which can increase the risk of an irregular heart rhythm that may be serious and potentially life-threatening, although it is a rare side effect. You may be more susceptible if you have a heart condition called congenital long QT syndrome, other cardiac diseases, conduction abnormalities, or electrolyte disturbances (for example, magnesium or potassium loss due to severe or prolonged diarrhea or vomiting). You should seek immediate medical attention if you develop sudden dizziness, lightheadedness, fainting, shortness of breath, or heart palpitations during treatment with these medications, whether together or alone. Consumption of alcoholic beverages or products containing alcohol or propylene glycol during treatment with fexinidazole may occasionally trigger a reaction in some patients similar to the disulfiram reaction, which includes unpleasant effects such as flushing, throbbing in head and neck, throbbing headache, difficulty breathing, nausea, vomiting, sweating, thirst, chest pain, rapid heartbeat, palpitation, low blood pressure, dizziness, lightheadedness, blurred vision, and confusion. Rarely, more severe reactions may include abnormal heart rhythm, heart attack, heart failure, unconsciousness, convulsions, and even death. Patients treated with fexinidazole should avoid using any products containing alcohol or propylene glycol during and for at least 48 hours after completion of therapy. Talk to your doctor or pharmacist if you have questions on how to take this or other medications you are prescribed. 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.