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antagonist Antalarmin CYP2D6 Zolpidem Volazocine Polish heroin Poppy tea Heroin Difenoxin Substance abuse Noroxycodone Frakefamide Alvimopan Deltorphin I Z4349 Loperamide/simethicone Prescription drug addiction Transdermal patch Phenacemide Norhydrocodone Methylnaltrexone Fentanyl azepane Cocaine intoxication BmTx3 IC-26 National Institute on Drug Abuse U-69,593 Erinacine Nufenoxole Parafluorofuranylfentanyl Α-Neoendorphin M320 (opioid) Endomorphin Noroxymorphone Nicomorphine Diphenoxylate Licarbazepine AD-1211 Dibutyrylmorphine 3-Monoacetylmorphine Vixotrigine Euphoria 1-Iodomorphine LY-2459989 Endomorphin-2 Neoendorphin Amastatin WHO Model List of Essential Medicines ABT-202 Nociceptin