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Methotrexate. 60% at lower doses, less at higher doses. [7] Methotrexate, formerly known as amethopterin, is a chemotherapy agent and immune-system suppressant. [4] It is used to treat cancer, autoimmune diseases, and ectopic pregnancies. [4] Types of cancers it is used for include breast cancer, leukemia, lung cancer, lymphoma, gestational ...
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.
Clearance (pharmacology) In pharmacology, clearance ( ) is a pharmacokinetic parameter representing the efficiency of drug elimination. This is the rate of elimination of a substance divided by its concentration. [1] The parameter also indicates the theoretical volume of plasma from which a substance would be completely removed per unit time.
A more intuitive characteristic of exponential decay for many people is the time required for the decaying quantity to fall to one half of its initial value. (If N (t) is discrete, then this is the median life-time rather than the mean life-time.) This time is called the half-life, and often denoted by the symbol t1/2.
Half-life (symbol t½) is the time required for a quantity (of substance) to reduce to half of its initial value. The term is commonly used in nuclear physics to describe how quickly unstable atoms undergo radioactive decay or how long stable atoms survive. The term is also used more generally to characterize any type of exponential (or, rarely ...
Absorption rate constant. The absorption rate constantKa 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. [ 1 ]
Dextromethorphan is the dextrorotatory enantiomer of levomethorphan, which is the methyl ether of levorphanol, both opioid analgesics. It is named according to IUPAC rules as (+)-3-methoxy-17-methyl-9α,13α,14α- morphinan. As its pure form, dextromethorphan occurs as an odorless, opalescent white powder.
Rate equation. In chemistry, the rate equation (also known as the rate law or empirical differential rate equation) is an empirical differential mathematical expression for the reaction rate of a given reaction in terms of concentrations of chemical species and constant parameters (normally rate coefficients and partial orders of reaction) only ...