Drug Interactions between sirolimus and toremifene

You should avoid drinking grapefruit juice during treatment with toremifene. Grapefruit juice may increase the blood levels of toremifene. This can make you more likely to develop side effects such as vaginal bleeding, blood clots, or an irregular heart rhythm that may be serious or life-threatening. Contact your doctor if you experience potential signs and symptoms of blood clots such as chest pain, shortness of breath, sudden loss of vision, and pain, redness or swelling your arms or legs. You should also seek immediate medical attention if you develop sudden dizziness, lightheadedness, fainting, or fast or pounding heartbeats during treatment with toremifene.

Talk to your doctor before using toremifene with soy products. There is some evidence that substances present in soy may stimulate breast tumor growth and interfere with the action of toremifene, although this has not been proven. Whether soy products are effective for hot flashes is also uncertain. 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.

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Grapefruit and grapefruit juice may interact with sirolimus and could lead to potentially dangerous effects. Avoid eating grapefruit or drinking grapefruit juice while you are taking sirolimus. Also, you should preferably take sirolimus at least one hour before eating. If you do take it with food, you should take it each time with food to avoid changes in sirolimus levels. The oral liquid form of sirolimus must be mixed with water or orange juice only. Do not use grapefruit juice to mix this medication.

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