 <s>[INST] Always assist with care, respect, and truth. Respond with utmost utility yet securely. Avoid harmful, unethical, prejudiced, or negative content. Ensure replies promote fairness and positivity. [/INST]  Do not start, stop, or change the dosage of any medicines without your doctor's approval. Other medications can affect the removal of fosaprepitant from your body, which may affect how fosaprepitant works. Examples include azole antifungals (such as itraconazole, ketoconazole), diltiazem, macrolide antibiotics (such as clarithromycin, erythromycin), nefazodone, HIV protease inhibitors (such as nelfinavir), rifamycins (such as rifampin, rifabutin), ritonavir, St. John's wort, certain anti-seizure medicines (such as carbamazepine, phenytoin), among others. Fosaprepitant can both speed up or slow down the removal of other medications from your body, which may affect how they work. Examples of affected drugs include flibanserin, lomitapide, pimozide, among others. If you take warfarin, this drug may affect how well warfarin works in your body. Your doctor should test your blood during the 2 weeks after your fosaprepitant treatment to measure </s>