| Prescription Opioids | Illegal Opioids | Semi-Synthetic & Synthetic Opioids | Opioid Antagonists |
| Morphine | Heroin | Fentanyl | Naloxone (Narcan) |
| Codeine | Carfentanil | U-47700 | Naltrexone |
| Oxycodone (OxyContin, Percocet) |
| MT-45 | Methylnaltrexone |
| Hydrocodone (Vicodin, Lortab, Norco) |
| 3-Methylfentanyl | Nalmefene |
| Fentanyl |
| Acetylfentanyl |
|
| Methadone |
| Butyrfentanyl |
|
| Hydromorphone (Dilaudid, Exalgo) |
| Furanylfentanyl |
|
| Oxymorphone (Opana) |
| Desomorphine (Krokodil) |
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| Meperidine (Demerol) |
| Thebaine |
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| Tramadol |
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| Tapentadol (Nucynta) |
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| Buprenorphine (Suboxone, Subutex) |
|
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| Pentazocine (Talwin) |
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| Levorphanol (Levo-Dromoran) |
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| Butorphanol |
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| Dihydrocodeine |
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| Levomethadyl Acetate (LAAM) |
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| Dextropropoxyphene |
|
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| Diphenoxylate (Lomotil) |
|
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| Paregoric |
|
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| Alfentanil (Alfenta) |
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| Rremifentanil (Ultiva) |
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| Sufentanil |
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| Dezocrine |
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| Anileridine |
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| Pethidine (Demerol) |
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