Elimination half life

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Topic: Elimination half life

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	Psychotropic Drug Metabolism in Old Age
		The rate of drug disappearance in the post-distributive phase after a single dose, or after termination of multiple dose treatment, is quantitated as an elimination half-life.
		The same half-life applies to the rate of attainment of steady-state after initiation of multiple dose therapy (without a loading dose), or the rate of attainment of a new steady-state condition if the maintenance dose is increased or decreased.
		Important confounding factors can be controlled for or eliminated, and the influence of age by itself on drug disposition can be isolated.
	www.acnp.org /g4/GN401000140/CH137.html

	clonazepam half life
		The elimination half - life of clonazepam is approximately 18 to 40 hours, whereas triazolam has an elimination half - life ranging from 1.5 to 5.5 hours.
		Since clonazepam has a relatively short half life, from 18 to 50 hours, I don't think it would be any easier to come off it using 1/64th mg capsules.
		The half - life of clonazepam is approximately 22â”33 hours in children and 19â”50 hours in adults.
	clonazepam.bdrto.com /clonazepam-half-life

	Brain Elimination Half-Life of Fluvoxamine Measured by 19F Magnetic Resonance Spectroscopy -- Strauss et al. 155 (3): 380 -- American Journal of Psychiatry
		appear to be well explained by the brain elimination half-life.
		Brain Elimination Half-Life of Fluvoxamine Measured by 19F Magnetic Resonance Spectroscopy -- Strauss et al.
		elimination from plasma for each subject is shown in figure 3.
	ajp.psychiatryonline.org /cgi/content/full/155/3/380

	Timing of samples for measurement of Therapeutic Drugs.
		The behaviour of most drugs can be represented by a single half life of accumulation after the dose and a single half life of elimination.
		The elimination half life is an important factor when multiple drug doses are given.
		If the doses are less than 3 to 5 elimination half lives apart, clearance of one dose is not completed before the next dose (Between 1/32 and 1/8 of the first dose remains in circulation when the second is taken).
	members.aol.com /Dripath/Patne59.htm

	Treatment of Pain in the Older Patient
		Elimination half-life is 1-3 days, and hence it can be given as a single bedtime dose.
		It is metabolized by the liver, with an average elimination half-life of 10 hours in healthy volunteers.
		Average elimination half-live is long (1 day) and is greatly prolonged in genetically poor metabolizers (about 5% of people), in whom accumulation can occur well past one week at any dose.
	www.ti.ubc.ca /pages/letter33.htm

	University of Washington Regional Epilepsy Center at Harborview Medical Center
		Comment: Steady-state values for the half life of carbamazepine are reached only after complete hepatic autoinduction, which occurs after approximately one month of carbamazepine administration.
		The half life of ethosuximide may be increased by valproate
		Elimination is predominantly hepatic by thiophene ring oxidation and glucuronidation.
	pcs.hmc.washington.edu /Epilepsy/EpiInfo/antiepiletic.htm

	Half-life
		It is a measure of the stability of an isotope; the shorter the half life, the less stable the atom.
		If this seems strange, note that the life of half of the particles is only somewhere between 0 and the half-life, while the life of the other half can be anywhere between the half-life and infinite.
		In physics, the half-life of a radioactive isotope is the time it takes for half of the atoms in a pure sample of the isotope to decay into another element.
	www.sciencedaily.com /encyclopedia/half_life

	Half-life - Wikipedia, the free encyclopedia
		More generally, for a quantity subject to exponential decay, the half-life is the time required for the quantity to fall to half of its initial value.
		is the half life of the second process.
		This page was last modified 05:45, 6 Jun 2005.
	en.wikipedia.org /wiki/Half_life

	Methamphetamine
		The maximum penalty for possession is then seven years imprisonment, and the maximum penalty for supplying is life.
		In the UK, methamphetamine is classified as a Class B drug (under the 1971 Misuse of Drugs Act).
		In some of the United States, manufacturing methamphetamine is punishable by a mandatory 10 year prison sentence.
	www.brainyencyclopedia.com /encyclopedia/m/me/methamphetamine.html

	Remeron Tablets Drug Information Remeron Tablets
		The mean elimination half-life of mirtazapine after oral administration ranges from approximately 20-40 hours across age and gender subgroups, with females of all ages exhibiting significantly longer elimination half-lives than males (mean half-life of 37 hours for females vs. 26 hours for males) (see Pharmacokinetics).
		The mean elimination half-life of mirtazapine after oral administration ranges from approximately 20-40 hours across age and gender subgroups, with females of all ages exhibiting significantly longer elimination half-lives than males (mean half-life of 37 hours for females vs. 26 hours for males).
		REMERON® has an elimination half-life of approximately 20-40 hours; therefore, dose changes should not be made at intervals of less than one to two weeks in order to allow sufficient time for evaluation of the therapeutic response to a given dose.
	www.drugs.com /PDR/Remeron_Tablets.html

	Iressa Clinical Pharmacology - gefitinib tablets - HealthScout
		Gefitinib is cleared primarily by the liver, with total plasma clearance and elimination half-life values of 595 mL/ min and 48 hours, respectively, after intravenous adminis-tration.
		Elimination is by metabolism (primarily CYP3A4) and excretion in feces.
		Excretion is predominantly via the feces (86%), with renal elimination of drug and metabolites accounting for less than 4% of the administered dose.
	www.healthscout.com /rxdetail/1/107/5/main.html

	EPA/OPPT: Office of Pollution Prevention & Toxics (OPPT): Perfluorooctanoic Acid (PFOA) and Its Salts
		In female rats elimination of PFOA appears to be biphasic; a fast phase occurs with a half life of approximately 2- 4 hours while a slow phase occurs with a half life of approximately 24 hours.
		This gender difference has not been observed in humans based on the limited data available in the half life study in retired workers.
		Castration increased the elimination of PFOA in the urine by >1-fold (36% of the dose was eliminated in 4 days versus 16% in controls), demonstrating that a factor produced by the testis is responsible for the slow elimination of PFOA in male rats.
	www.epa.gov /opptintr/pfoa/pfoara.htm

	truPK
		In the Elimination Half Life model, developed by Strand Genomics, several machine-learning methods including neural networks, decision trees and support vector machines were employed to identify a small set from 1054 molecular descriptors that correlated with this pharmacokinetic parameter.
		This Elimination Half Life model predicts the half-life (in Hours) of a drug observed in the plasma.
		Elimination Half-life Training, Cross Validation and Testing Statistics:
	trupk.strandgenomics.com /modelEliminationHalfLife.html

	Elimination half-life - Wikipedia, the free encyclopedia
		The elimination half-life of a drug (or any xenobiotic agent) refers to the timecourse necessary for the quantity of the xenobiotic agent in the body (or plasma concentration) to be reduced to half of its original level through various elimination processes.
		The relationship between the elimination rate constant and half-life is given by the following equation:
		ethanol may be consumed in sufficient quantity to saturate the metabolic enzymes in the liver, and so is eliminated from the body at an approximately constant rate (zero-order elimination).
	en.wikipedia.org /wiki/Elimination_half-life

	Nicotine metabolism and elimination kinetics in newborns.
		The elimination half-life for cotinine was 16.3 hours (95% CI, 12.4 to 23.9) based on blood data and was 22.8 hours (95% CI, 19.5 to 25.8) based on urine data.
		The elimination half-life for nicotine was 11.2 hours (95% confidence interval [CI], 8.0 to 18.9) based on blood data and 9.0 hours (95% CI, 7.0 to 12.4) based on urine data.
		NONMEM was used to determine population half-life values.
	www.ucsf.edu /smoking/cgi-bin/cexec/ccompletedprograms/article.pl?id=973735403

	The elimination half life
		Half life is the time taken for the concentration (in the plasma) to fall by one half
	www.dr-green.co.uk /Powerpoint/Pharmacokinetics%20KCSMD%202000%20web/sld039.htm

	Effexor - Effexor Side Effects - Effexor Information - Canada Pharmacy - Canada Drugs
		Patients with Renal Impairment: Given the decrease in clearance for venlafaxine and increase in elimination half-life for both venlafaxine and ODV that is observed in patients with renal impairment (GFR=10 to 70 mL/min) compared to normal subjects (see Pharmacology), it is recommended that the total daily dose be decreased by 25 to 50%.
		Patients with Hepatic Impairment: Given the decrease in clearance and increase in elimination half-life for both venlafaxine and ODV that is observed in patients with hepatic cirrhosis compared with normal subjects (see Pharmacology), it is recommended that the total daily dose be reduced by about 50% in patients with moderate hepatic impairment.
		Venlafaxine elimination half-life was prolonged by about 30%, and clearance was decreased by about 50% in cirrhotic patients compared to normal subjects.
	www.rxcarecanada.com /Effexor.asp

	Dioxin Cancer Potency Lower Than Once Thought - C3.org
		In the case of dioxin elimination from the human body, the half-life is the time it takes the human body to eliminate one-half of all of the dioxin it contains.
		New research shows a much different equation applies: The half-life of dioxin elimination depends on the amount of dioxin in the body.
		Scientists used to think that the half-life of dioxin elimination was about 7 years.
	c3.org /chlorine_issues/understanding_dioxin/potency.html

	Pharmacy-List.com - Drug Information
		Because the longer elimination half-life of etretinate would increase the duration of teratogenic potential for female patients, ethanol must not be ingested by female patients either during treatment with Soriatane or for 2 months after cessation of therapy.
		Etretinate has a much longer elimination half-life compared to that of acitretin.
		This allows for elimination of the acitretin which can be converted to etretinate in the presence of alcohol.
	www.pharmacy-list.com /pharmlist/druginfo.php?id=24

	HDCN: Review of abstract by Ward et al. Heparinization for routine hemodialysis ARRT 10 1995
		Elimination half life is determined by starting heparin infusion after a loading dose and determining the rise or fall in WPBPTT or ACT.
		Heparin pharmacokinetics are defined according to two variables: sensitivity and elimination half-life.
		Sensitivity is determined by injecting a test dose of heparin and measuring the prolongation of WBPTT or ACT.
	www.hdcn.com /5/510arrwa.htm

	Valium Online - Purchase Generic Valium (USA Rxlist) - Cheap Valium Buy Now
		The elimination half-life may be prolonged in the newborn, in the elderly and in patients with liver disease.
		The decline in the plasma concentration-time profile after oral administration is biphasic, an initial rapid and extensive distribution phase being followed by a prolonged terminal elimination phase (half-life upto 48 hours).
		The terminal elimination half-life of the active metabolite N-desmethyldiazepam is upto 100 hours.
	www.usarxlist.com /valium.html

	Doncaster Royal Pathology Assay Information System.
		By the time the patient becomes anuric, the elimination half life will be increased to 100 hrs or more producing a several fold increase in the digoxin concentrations at all times and there may be a very large excess of digoxin accumulated in the tissues.
		In normal individuals the half life is 40 hours and the individual dose is likely to have been established under these conditions.
		Deterioration in renal function leads to increased Half life (up to 100 hrs or more) and is a common cause of toxicity.
	members.aol.com /Dripath/Digtim.htm

	Toxicology Glossary: E
		elimination half-life or half time: Period taken for the plasma concentration of a substance to decrease by half.
		elimination: Expulsion of a substance or other material from an organism (or a defined part thereof), usually by a process of extrusion or exclusion, sometimes after metabolic transformation.
		excretion: Discharge or elimination of an absorbed or endogenous substance, or of a waste product, and/or their metabolites, through some tissue of the body and its appearance in urine, faeces, or other products normally leaving the body.
	www.sis.nlm.nih.gov /Glossary/e.html

	Case 2 - Auburn University
		Drug elimination half-life had not been previously determined for phenobarbital in this patient so a change in half-life could not be documented.
		Phenobarbital therapy was discontinued for one drug elimination half-life and restarted at the same dose.
		Chloramphenicol is a potent inhibitor of drug metabolizing enzymes, resulting in decreased phenobarbital clearance.
	www.vetmed.auburn.edu /index.pl/case_2

	Pharmacokinetic Properties of Nucleoside/Nucleotide Reverse Transcriptase Inhibitors
		The key parameter is the half-life; however, the plasma elimination half-life of the NRTIs/NtRTIs as administered is of little use in developing a dosing schedule.
		The mean plasma elimination half-life of FTC after a single dose is about 8-10 hours in HIV-infected patients.
		The volume of distribution of ddI is approximately 1 L/kg, and the serum elimination half-life ranges from 0.6-2.8 hours.
	www.natap.org /2004/HIV/082304_02.htm

	Elimination Rate Constant / Half-Life
		Elimination half-life is the time required for the amount of drug (or concentration) in the body to decrease by half.
		The elimination "half-life" is better suited for this because after 5 half-lives, approximately 97% of the drug is gone.Therefore, it is useful to be able to interconvert CL, Ke, and half-life.
		Ke, the elimination rate constant can be defined as the fraction of drug in an animal that is eliminated per unit of time, e.g., fraction/h.
	www.vet.purdue.edu /bms/courses/pkinet/ke_const.htm

	Antiarrhythmic Drug Guide
		Elimination half-life of PC: 2.5-4.7 hours in adults.13.5 hours in neonates.7 hours in 7-12 year olds.1st order to at least to 26 ug/ml.
		Elimination half-life 1.8 hours in adults and children aged 6 m- 3 years, 3.2 hours in neonates.
		Variable elimination half-life: 2.4-11.8 hours (Up to 26 hours in slow metabolizers).
	pediep.stanford.edu /Drug_guide-2000.html

	Fluoxetine - RxList Generic Information
		THE LONG ELIMINATION HALF-LIVES OF FLUOXETINE AND ITS METABOLITES--Because of the long elimination half-lives of the parent drug and its major active metabolite, changes in dose will not be fully reflected in plasma for several weeks, affecting both strategies for titration to final dose and withdrawal from treatment (See Clinical Pharmacology And Dosage and Administration).
		The long elimination half-lives of fluoxetine and norfluoxetine assure that, even when dosing is stopped, active drug substance will persist in the body for weeks (primarily depending on individual patient characteristics, previous dosing regimen, and length of previous therapy at discontinuation).
		The primary route of elimination appears to be hepatic metabolism to inactive metabolites excreted by the kidney.
	www.peru.k12.in.us /PJHS/Teacher/Jsites/top200/fluoxetine.htm

	Reproductive Biology and Endocrinology Full text Fast renal trapping of porcine Luteinizing Hormone (pLH) shown by 123I-scintigraphic imaging in rats explains its short circulatory half-life
		In order to relate more precisely hepatic trapping of these glycoproteic hormones with their circulatory half-life, we undertook a comparative study of the distribution and elimination of porcine LH (pLH) and equine CG (eCG) which exhibit respectively a short and a long half-life.
		It was expected that such a shunt would enhance the short half-life of pLH.
		We expected that the elimination of injected pLH would be slower when hepatic portal circulation was totally derived to vena cava and jugular vein since receptors for sulfated-GalNAc-GlcNac-Man are present in the liver [ 4 ].
	www.rbej.com /content/1/1/64

	Untitled Document
		The mean serum elimination half-life was 6.6 +/- 2.0 h, with a wide range of values (1.9 h to 15.1 h).
		These results indicate that MMI has good oral bioavailability and has a longer mean serum elimination half-life than propylthiouracil, the other anti-thyroid drug that has been evaluated in cats.
		No significant change in serum elimination half-life or total body clearance was found after multiple-dose administration of MMI.
	www.hypurrcat.com /All%20available%20publications/available107.htm

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