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Pharmacokinetics is based on mathematical modeling that places great emphasis on the relationship between drug plasma concentration and the time elapsed since the drug's administration. Pharmacokinetics is the study of how an organism affects the drug, whereas pharmacodynamics (PD) is the study of how the drug affects the organism.
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.
Contrary to what many advertised drug tests might promise, not all substances leave their telltale chemical signature in the body for the same amount of time. The moment we take a drug — whether ...
Unlike cimetidine, the first H 2 antagonist, famotidine has a minimal effect on the cytochrome P450 enzyme system and does not appear to interact with as many drugs as other medications in its class. Some exceptions include antiretrovirals such as atazanavir , chemotherapeutics such as doxorubicin , and antifungal medications such as itraconazole .
The main discussion of these abbreviations in the context of drug prescriptions and other medical prescriptions is at List of abbreviations used in medical prescriptions. Some of these abbreviations are best not used, as marked and explained here.
[2] [39] Its duration of action has been reported to be about 6 to 8 hours. [9] The duration of MDA is longer than that of MDMA, about 8 hours for MDA versus 6 hours for MDMA. [2] [39] The elimination half-life of MDA is 10.9 hours. [2] Differences in the duration of MDA versus MDMA may be due pharmacodynamics rather than pharmacokinetics. [2] [39]
The word pharmacy is derived from Old French farmacie "substance, such as a food or in the form of a medicine which has a laxative effect" from Medieval Latin pharmacia from Greek pharmakeia (Ancient Greek: φαρμακεία) "a medicine", which itself derives from pharmakon (φάρμακον), meaning "drug, poison, spell" [44] [45] [a ...
Pharmacology can also focus on specific systems comprising the body. Divisions related to bodily systems study the effects of drugs in different systems of the body. These include neuropharmacology, in the central and peripheral nervous systems; immunopharmacology in the immune system.