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Phenobarbital has an oral bioavailability of about 90%. Peak plasma concentrations (C max) are reached eight to 12 hours after oral administration. It is one of the longest-acting barbiturates available – it remains in the body for a very long time (half-life of two to seven days) and has very low protein binding (20 to 45%).
In practice, it is generally considered that once regular dosing of a drug is started, steady state is reached after 3 to 5 times its half-life. In steady state and in linear pharmacokinetics, AUC τ =AUC ∞. [8]
Primidone and the other enzyme-inducing anticonvulsants can cut the half-life of antipyrine roughly in half (6.2 ± 1.9 h vs. 11.2 ± 4.2 h), and increases the clearance rate by almost 70%. Phenobarbital reduces the half-life to 4.8 ± 1.3 and increases the clearance by almost 109%. [66]
The concept of Ct was first proposed by Fritz Haber and is sometimes referred to as Haber's law, which assumes that exposure to 1 minute of 100 mg/m 3 is equivalent to 10 minutes of 10 mg/m 3 (1 × 100 = 100, as does 10 × 10 = 100). Some chemicals, such as hydrogen cyanide, are rapidly detoxified by the human body, and do not follow Haber's law.
Thiopental is a barbiturate with one of the C=O double bonds (with the carbon being labelled 2 in the adjacent diagram) replaced with a C=S double bond, R 1 being CH 2 CH 3 (ethyl) and R3) being CH(CH 3)CH 2 CH 2 CH 3 (sec-pentyl). Thiopental is no longer available in the United States.
Symbolab is an answer engine [1] that provides step-by-step solutions to mathematical problems in a range of subjects. [2] It was originally developed by Israeli start-up company EqsQuest Ltd., under whom it was released for public use in 2011.
The Casio Algebra FX series was a line of graphing calculators manufactured by Japanese electronics company Casio Computer Co., Ltd from 1999 to 2003. They were the successor models to the CFX-9970G, the first Casio calculator with computer algebra system , or CAS, a program for symbolic manipulation of mathematical expressions.
Luminal (phenobarbital) – a barbiturate with sedative and hypnotic properties; R. Remeron (mirtazapine) – an atypical antidepressant, used off-label as a sleep aid;