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Often, the parent form of the drug is not the active form and it needs to be metabolized in order to produce its therapeutic effects. In other cases, bioactivation is not necessarily needed for drugs to be active and can instead produce reactive intermediates that initiate stronger adverse effects than the original form of the drug.
When two drugs affect each other, it is a drug–drug interaction (DDI). The risk of a DDI increases with the number of drugs used. [1] A large share of elderly people regularly use five or more medications or supplements, with a significant risk of side-effects from drug–drug interactions. [2] Drug interactions can be of three kinds:
English: A rational scale to assess the harm of drugs. Data source is the March 24, 2007 article: Nutt, David, Leslie A King, William Saulsbury, Colin Blakemore. "Development of a rational scale to assess the harm of drugs of potential misuse" The Lancet 2007; 369:1047-1053.
When designing drugs, the placebo effect must be considered to assess the drug's true therapeutic value. Drug development uses techniques from medicinal chemistry to chemically design drugs. This overlaps with the biological approach of finding targets and physiological effects.
There are inherent risks to everything in life from drug use to driving. The measure of the harmfulness of a drug should be considered as a ratio of the number of people consuming the drug to the side effects occured. For the most part, ranking system seems very well researched and depicted. Sure there are some contentious areas.
The drug riluzole is a neuroprotective drug that blocks sodium ion channels. Since these channels cannot activate, there is no action potential, and the neuron does not perform any transduction of chemical signals into electrical signals and the signal does not move on. This drug is used as an anesthetic as well as a sedative. [8]
Effect of drug dosage on symptom severity: In a study of how different doses of a drug affect the severity of symptoms, a researcher could compare the frequency and intensity of symptoms when different doses are administered. Here the independent variable is the dose and the dependent variable is the frequency/intensity of symptoms.