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It has a bioavailability of 20-40%, reaches peak plasma concentration in about 45 minutes, and in healthy subjects has an average half-life of 5 hours (observed range 2 - 10 hours). [7] Scopolamine is primarily metabolized by the CYP3A4 enzyme, and Grapefruit juice decreases metabolism of scopolamine, consequently increasing plasma ...
Rectal temperature is expected to be approximately 1 °F (0.56 °C) higher than an oral temperature taken on the same person at the same time. Ear thermometers measure temperature from the tympanic membrane using infrared sensors and also aim to measure core body temperature, since the blood supply of this membrane is directly shared with the ...
Hyoscine butylbromide, also known as scopolamine butylbromide [4] and sold under the brandname Buscopan among others, [5] is an anticholinergic medication used to treat abdominal pain, esophageal spasms, bladder spasms, biliary colic, [6] and renal colic. [7] [8] It is also used to improve excessive respiratory secretions at the end of life. [9]
Polonium in the body has a biological half-life of about 30 to 50 days. Caesium in the body has a biological half-life of about one to four months. Mercury (as methylmercury) in the body has a half-life of about 65 days. Lead in the blood has a half life of 28–36 days. [29] [30] Lead in bone has a biological half-life of about ten years.
For example, the medical sciences refer to the biological half-life of drugs and other chemicals in the human body. The converse of half-life (in exponential growth) is doubling time. The original term, half-life period, dating to Ernest Rutherford's discovery of the principle in 1907, was shortened to half-life in the early 1950s. [1]
The rate at which a drug enters into the body for oral and other extravascular routes. 0.693 h −1: Elimination half-life: The time required for the concentration of the drug to reach half of its original value.
Clearance of a substance is sometimes expressed as the inverse of the time constant that describes its removal rate from the body divided by its volume of distribution (or total body water). In steady-state, it is defined as the mass generation rate of a substance (which equals the mass removal rate) divided by its concentration in the blood.
Simplified control circuit of human thermoregulation. [8]The core temperature of a human is regulated and stabilized primarily by the hypothalamus, a region of the brain linking the endocrine system to the nervous system, [9] and more specifically by the anterior hypothalamic nucleus and the adjacent preoptic area regions of the hypothalamus.