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  2. Ondansetron - Wikipedia

    en.wikipedia.org/wiki/Ondansetron

    In 1997, ondansetron was the subject of a meta-analysis case study. Researchers examined 84 trials, with 11,980 people receiving ondansetron, published between 1991 and September 1996. Intravenous ondansetron 4 mg versus placebo was investigated in 16 reports and three further reports which had been duplicated a total of six times.

  3. Biological half-life - Wikipedia

    en.wikipedia.org/wiki/Biological_half-life

    Absorption half-life 1 h, elimination half-life 12 h. Biological half-life ( elimination half-life , pharmacological half-life ) is the time taken for concentration of a biological substance (such as a medication ) to decrease from its maximum concentration ( C max ) to half of C max in the blood plasma .

  4. 5-HT3 antagonist - Wikipedia

    en.wikipedia.org/wiki/5-HT3_antagonist

    Ondansetron was approved by the U.S. Food and Drug Administration in 1991, and has since become available in several other countries, including the UK, Ireland, Australia, Canada, France and Brazil. As of 2008, ondansetron and granisetron are the only 5-HT 3 antagonists available as a generic drug in the United States. Ondansetron may be given ...

  5. Effective half-life - Wikipedia

    en.wikipedia.org/wiki/Effective_half-life

    An effective half-life of the drug will involve a decay constant that represents the sum of the biological and physical decay constants, as in the formula: = + With the decay constant it is possible to calculate the effective half-life using the formula:

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  7. Equianalgesic - Wikipedia

    en.wikipedia.org/wiki/Equianalgesic

    An equianalgesic chart can be a useful tool, but the user must take care to correct for all relevant variables such as route of administration, cross tolerance, half-life and the bioavailability of a drug. [5] For example, the narcotic levorphanol is 4–8 times stronger than morphine, but also has a much longer half-life. Simply switching the ...

  8. Half-life - Wikipedia

    en.wikipedia.org/wiki/Half-life

    In this situation it is generally uncommon to talk about half-life in the first place, but sometimes people will describe the decay in terms of its "first half-life", "second half-life", etc., where the first half-life is defined as the time required for decay from the initial value to 50%, the second half-life is from 50% to 25%, and so on.

  9. Absorption rate constant - Wikipedia

    en.wikipedia.org/wiki/Absorption_rate_constant

    The absorption rate constant K a is a value used in pharmacokinetics to describe the rate at which a drug enters into the system. It is expressed in units of time −1. [1] The K a is related to the absorption half-life (t 1/2a) per the following equation: K a = ln(2) / t 1/2a.

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