Over the next few years, numerous similar chemicals (specifically 4-hydroxycoumarins with a large aromatic substituent at the 3 position) were found to have the same anticoagulant properties. The first drug in the class to be widely commercialized was dicoumarol itself, patented in 1941 and later used as a pharmaceutical. Karl Link continued working on developing more potent coumarin-based anticoagulants for use as rodent poisons, resulting in warfarin in 1948. The name "warfarin" stems from the acronym WARF, for Wisconsin Alumni Research Foundation + the ending "-arin" indicating its link with coumarin. Warfarin was first registered for use as a rodenticide in the US in 1948, and was immediately popular. Although warfarin was developed by Link, the Wisconsin Alumni Research Foundation financially supported the research and was assigned the patent.After an incident in 1951, in which an army inductee attempted suicide with multiple doses of warfarin in rodenticide, but recovered fully after presenting to a naval hospital and being treated with vitamin K (by then known as a specific antidote), studies began in the use of warfarin as a therapeutic anticoagulant. It was found to be generally superior to dicoumarol, and in 1954, was approved for medical use in humans.
In addition, the effectiveness and safety of long-term use of sedative hypnotics has been determined to be no better than placebo after 3 months of therapy and worse than placebo after 6 months of therapy. Pharmacology
Flurazepam is a "classical" benzodiazepine; some other classical benzodiazepines include diazepam, clonazepam, oxazepam, lorazepam, nitrazepam, bromazepam, and clorazepate. Flurazepam generates an active metabolite, N-desalkylflurazepam, with a very long elimination half-life. Flurazepam could be therefore unsuitable as a sleeping medication for some individuals due to next-day sedation; however, this same effect may also provide next-day anxiety relief. Residual hangover effects after nighttime administration of flurazepam, such as sleepiness, impaired psychomotor and cognitive functions, may persist into the next day, which may impair the ability of users to drive safely and increase risks of falls and hip fractures.Flurazepam is lipophilic, is metabolized hepatically via oxidative pathways. The main pharmacological effect of flurazepam is to increase the effect of GABA at the GABAA receptor via binding to the benzodiazepine site on the GABAA receptor causing an increase influx of chloride ions into the GABAA neuron.Flurazepam is contraindicated in pregnancy. It is recommended to withdraw flurazepam during breast feeding, as flurazepam is excreted in breast milk. Society and culture
Drug misuse
Flurazepam is a drug with potential for misuse. Two types of drug misuse can occur, either recreational misuse where the drug is taken to achieve a high, or when the drug is continued long term against medical advice. Legal status
Flurazepam is a Schedule IV drug under the Convention on Psychotropic Substances.