Following intranasal administration of BDP in healthy males, the systemic absorption was assessed by measuring the plasma concentrations of its active metabolite B-17-MP, for which the absolute bioavailability following intranasal administration is 44% (95% CI 28%, 70%). After intranasal administration, <1% of the dose is absorbed by the nasal mucosa. The remainder after being cleared from the nose, either by drainage or mucocilary clearance, is available for absorption from the gastrointestinal tract. Plasma B-17-MP is almost entirely due to conversion of BDP absorbed from the swallowed dose.
It may take up to 4 weeks for the ears to start feeling normal. One must also try to pop the ears immediately after nasal spray use and every hour while awake throughout this period of time. When one tries to pop the ears, try to blow out your nose with your nose pinched shut with your fingers. Popping the ears in this manner, esp after nasal spray use helps to squeeze some of the medication into the eustachian tube. Do not exceed the pressure one uses as if you have mild constipation. Swallowing or yawning does not work as well in this situation.