<p>Potent inhibitors of cytochrome P450 3A4 (CYP3A4) may increase exposure to Fluticasone Furoate. Coadministration of ritonavir is not recommended. Use caution with coadministration of other potent CYP3A4 inhibitors, such as ketoconazole.<br />
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Special instruction: Patients should be instructed that the device must be primed: before first use, and if the cap is left off or if the device does not seem to be working or if the nasal spray has not been used for 30 days or more. In order to prime the device, the nasal spray needs to be shaken vigorously for about 10 seconds with the cap on. The patient must then press the button firmly all the way in, approximately 6 times until a fine mist is seen. Once primed, the patient must shake the nasal spray vigorously each time before use.</p>