- Feb 7, 2013
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So after quite a bit of research, I've learned there is no way for an injected oral to be subject to first pass liver metabolization.
This is a simply matter of plumbing-
Once something is ingested... It's broken down in the stomach, then moves into the small intestine where it's absorbed into the blood stream and then is shuttled via hepatic portal vein into the liver for metabolization.
This is the only way something would be subject to first pass metabolization- if you administer a drug via intramuscular injection then it's absorbed directly and by passes the liver.
So from a physiological point of view- no injectable orals are not as hepatoxic, but none the less they still impose a great deal of stress on the renal system.
This is a simply matter of plumbing-
Once something is ingested... It's broken down in the stomach, then moves into the small intestine where it's absorbed into the blood stream and then is shuttled via hepatic portal vein into the liver for metabolization.
This is the only way something would be subject to first pass metabolization- if you administer a drug via intramuscular injection then it's absorbed directly and by passes the liver.
So from a physiological point of view- no injectable orals are not as hepatoxic, but none the less they still impose a great deal of stress on the renal system.
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