Propoxyphene is an opiod with chemical similarity to methadone and used as an analgesic. They mainly act by blocking the opiod receptors that carry pain signals to the brain. But they have additional effects like producing euphoria. Though initially started as an analgesic, they progressively cause drug dependence and produce harmful effects. It is largely due to the tolerance gained by the system against the drug. Finally they lead to addiction resulting in severe withdrawal symptoms. Propoxyphene drug test is lateral flow Immunochromatographical assay for the qualitative detection of propoxyphene and norpropoxyphene in urine.

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