In radiology, the threshold dose is the smallest dose of radiation that will produce a specified effect. In the larger context of toxic exposure, threshold dose refers to the dose below which no harm is done. There is a threshold below which relatively...

The minimum amount of a substance or numbers of pathogenic organisms that are capable of producing an effect. In terms of radiation the effective dose is that calculated to have been received by a person allowing for differential absorption and effects...

An effective dose in pharmacology is the amount of drug that produces a therapeutic response in 50% of the people taking it, sometimes also called ED-50. In radiation protection it is an estimate of the stochastic effect that a non-uniform radiation...

Common children's cold and cough medicines are coming under scrutiny from federal drug regulators, who say the remedies and their recommended doses have not been studied enough in children, a newspaper reported.Dr. Charles J. Ganley, a top Food and Drug Administration official, said the agency...

U.S.government health officials began cracking down Wednesday on Internet sales of custom-mixed hormones for menopausal women, a market created when doctors deemed prescription estrogen therapy too risky for many patients.But the Food and Drug Administration says these alternative hormone mixes are no safer, and the...

An experimental cholesterol treatment touted by drugmaker Merck & Co. significantly reduced artery-clogging fats in late-stage testing, but it got a mixed reception from Wall Street analysts Tuesday.The drug, called Cordaptive, can both raise good cholesterol and lower bad cholesterol. It combines an extended-release form...

Government health officials began cracking down Wednesday on Internet sales of custom-mixed hormones for menopausal women, a market created when doctors deemed prescription estrogen therapy too risky for many patients.But the Food and Drug Administration says these alternative hormone mixes are no safer, and the...