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1 FACTORS AFFECTING DRUG ABSORPTION List of content :-- I. PHARMACEUTICAL FACTORS A] Chemical factors B] Physicochemical properties of drug substances 1.drug solubility & dissolution rate 2.--Which increases the pH of the diffusion layer, which promotes the solubility and dissolution of a weak acid and absorption is bound to be rapid. ï· Reverse in the case of salts of weak bases, it lowers the pH of diffusion layer and the promoted the absorption of basic drugs.
Heroin's oral bioavailability is both dose-dependent (as is morphine's) and significantly higher than oral use of morphine itself, reaching up to 64.2% for high doses and 45.6% for low doses; opiate-naive users showed far less absorption of the drug at low doses, having bioavailabilities of only up to 22.9%.