JASS92 said:This entire post is wrong. Morphine's Bioavailability is much higher intranasally than orally.
In response to this thread, I believe the reason has to do with reaching peak plasma levels via protein binding. Oxycodone does not avoid first pass metabolism anyway, its just that oral Oxycodone it is readily converted into its active metabolites before being transmitted throughout the blood. With insufflation you reach peak plasma levels faster, but protein binding is less efficient. Voila.
aeguy567 said:When they say that the nasal BA is 60% they are saying that when snorted 60% of the drug absorbs through the mucus membranes, the other 40% that isn't absorbed can then "drip" down into your stomach and be absorbed there, well it'd be more like 30ish% because not all of the shite you snort that doesn't get absorbed is going to make it to your stomach.
Bioavailability refers to the difference between the amount of a substance, such as a drug, herb, or chemical, to which a person is exposed and the actual dose of the substance the body receives.