Absorption Of Opioid Drugs

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Absorption: The absorption of opioid drugs into the bloodstream is largely dependent on the user’s chosen route of administration for the drug, dosage, and lipid solubility. Most NMPOs are taken orally, and absorbed into the bloodstream from the walls of the intestine. Some abusers crush and convert whole prescription pills into powders that can be smoked, snorted, and injected easily. Alternative routes of administration enable users to combine NMPO active compounds with other drugs for a unique effect as well as increase drug bioavailability. More specifically, alternate routes of administration also result in a more potent and rapid delivery of drug to the brain, which often increases to the abuse potential of the drug (Kollins, 2003; Roset et al., 2001). Studies using nationally representative samples report that men use these alternative routes of administration more frequently than women (Back et al., 2011, 2010; Green et al., 2009). Back et al. reported in 2011, a striking disproportion between men and women in this regard; the majority of men in their sample reported frequently snorting (75%), or injecting (42%) their drugs, while women were much more likely to use NMPOs via oral administration (Back, Lawson et al., 2011).
Distribution (reviewed by Gandhi, Aweeka, Greenblatt, & Blaschke, 2004) : Many factors affect the distribution of opioid drugs throughout the body, including body mass index (BMI), body composition, plasma volume, organ blood flow, and the degree to which a drug binds to tissues and plasma proteins (Atkinson, Huang, Lertora, & Markey, 2012). Women have a higher body fat percentage, a lower average body weight, a smaller average plasma volume, and lower average organ blood flow than men; thus, it ...

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...nton, 2010)Most metabolites produced by opioids are inactive or less active than the parent compounds and do not have clinically relevant pharmacological actions, other opioids such as codeine have metabolites (e.g. morphine) that are at least as potent as the parent drug and may produce analgesic effects as well as adverse effects. Most opioid metabolites are eventually filtered from the blood via glomerular filtration by the kidneys and excreted through the urine. Detection of these metabolites in the urine serves as the basis for most drug screening tests. Patients with renal failure and other kidney problems may have poor excretion of opioids and other waste products. In addition to renal excretion, glucuronide metabolites may be excreted via the biliary secretion. Bile flows from the bile duct in the liver to the intestine and then excretion through the stool.

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