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These combinations are considered extremely harmful and should always be avoided. Reactions to these drugs taken in combination are highly unpredictable and have a potential to cause death.
There is considerable risk of physical harm when taking these combinations, they should be avoided where possible.
These combinations are not usually physically harmful, but may produce undesirable effects, such as physical discomfort or overstimulation. Extreme use may cause physical health issues. Synergistic effects may be unpredictable. Care should be taken when choosing to use this combination.
Classified as habit-forming. As a potent fentanyl analog, it carries significant risk of psychological dependence consistent with other opioids.
Extremely potent opioid where active doses are measured in micrograms, with a very narrow margin between effective and lethal doses. Blood concentrations of 1-45 μg/L have been observed in fatal overdose cases. At least seven deaths in Cook County, Illinois were linked to furanylfentanyl in 2016, with additional deaths in suburban Chicago in 2017 and documented fatalities in Sweden and Canada.
Potentially serious respiratory depression can occur at active doses and is life-threatening; this is the primary mechanism of fatal opioid overdose and represents the most significant acute risk with this substance.
Furanylfentanyl was first characterized during research conducted in the 1980s, when studies in humans demonstrated it to be approximately 50 to 100 times more potent than morphine, placing it at roughly half the potency of fentanyl. Despite this early pharmacological characterization, the compound…
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