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Very limited dosage information is available for this substance.
Classified as habit-forming. Very limited information is available due to the rarity of this substance.
No specific lethal dose information is available. Overdose may result in respiratory depression.
4-MeO-Butyrfentanyl is a rare synthetic opioid belonging to the fentanyl analogue class of compounds. The substance has received minimal documentation in both scientific literature and online harm reduction communities, and its precise history of synthesis and development remains poorly documented. It should be distinguished from the related compound butyrfentanyl, which has been more extensively characterized.