The physiological availability of a given amount of a drug, as distinct from its chemical potency; proportion of the administered dose which is absorbed into the bloodstream.

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bio·avail·abil·i·ty -ə-.vā-lə-'bil-ət-ē n, pl -ties the degree and rate at which a substance (as a drug) is absorbed into a living system or is made available at the site of physiological activity
bio·avail·able -'vā-lə-bəl adj

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the proportion of a drug that is delivered to its site of action in the body. This is usually the amount entering the circulation and may be low when the drugs are given by mouth.

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bio·avail·a·bil·i·ty (bi″o-ə-vāl″ə-bilґĭ-te) the degree to which a drug or other substance becomes available to the target tissue after administration.

Medical dictionary. 2011.

Look at other dictionaries:

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  • Bioavailability — In pharmacology, bioavailability (BA) is a subcategory of absorption and is used to describe the fraction of an administered dose of unchanged drug that reaches the systemic circulation, one of the principal pharmacokinetic properties of drugs.… …   Wikipedia

  • bioavailability — noun Date: 1971 the degree and rate at which a substance (as a drug) is absorbed into a living system or is made available at the site of physiological activity • bioavailable adjective …   New Collegiate Dictionary

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  • bioavailability — Relative amount of a drug (or other substance) that will reach the systemic circulation when administered by a route other than direct intravenous injection …   Dictionary of molecular biology

  • bioavailability — bioavailable, adj. /buy oh euh vay leuh bil i tee/, n. Biochem. the extent to which a nutrient or medication can be used by the body. [1965 70; BIO + AVAILABILITY] * * * …   Universalium

  • bioavailability — noun The amount of drug which reaches the site of physiological activity after administration. See Also: bio unavailable …   Wiktionary

  • Bioavailability — Bi|o|a|vail|a|bi|li|ty [baɪɔɔveɪlɔ bɪlɪtɪ; bio ; engl. availability = Verfügbarkeit], die; , …ities: svw. ↑ Bioverfügbarkeit …   Universal-Lexikon

  • bioavailability — The state of being capable of being absorbed and available to interact with the metabolic processes of an organism. Typically a function of chemical properties, physical state of the material to which an organism is exposed, and the ability of… …   Petroleum refining glossary

  • bioavailability — n. extent and rate which a drug (or other substance) is absorbed and becomes available in a physiologically active form …   English contemporary dictionary

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