Opioid Scale
130 substances mapped across opioid dimensions
Opioid Intensity Spectrum
0 — None
5 — Moderate
10 — Extreme
1
Threshold
Barely perceptible effects that may be placebo.
2
Light
Subtle effects that are clearly present but mild.
3
Light+
Noticeable effects that remain easy to manage.
4
Moderate
Clearly defined effects that shape the experience.
5
Moderate+
Pronounced effects that are hard to ignore.
6
Strong
Dominant effects that strongly influence the experience.
7
Strong+
Powerful effects that can become overwhelming at times.
8
Intense
Very powerful effects approaching peak intensity.
9
Intense+
Near-maximum intensity with little room above.
10
Extreme
Maximum intensity — effects dominate the experience entirely.
All Substances
Showing 5 of 130
| # | Substance | Intensity | Reports |
|---|---|---|---|
| 1 | Tramadol | 8.1 Intense | 403 |
| 2 | Heroin | 8.6 Intense+ | 377 |
| 3 | Oxycodone | 7.0 Strong+ | 350 |
| 4 | Hydrocodone | 8.0 Intense | 266 |
| 5 | Codeine | 8.3 Intense | 198 |
| 6 | Buprenorphine | 8.1 Intense | 152 |
| 7 | Methadone | 8.3 Intense | 149 |
| 8 | Opium | 6.6 Strong+ | 147 |
| 9 | Morphine | 6.9 Strong+ | 137 |
| 10 | Fentanyl | 7.6 Intense | 108 |
| 11 | L-Tryptophan | 3.9 Moderate | 101 |
| 12 | Oxymorphone | 8.1 Intense | 71 |
| 13 | Hydromorphone | 8.3 Intense | 70 |
| 14 | Olanzapine | 4.9 Moderate+ | 60 |
| 15 | Naloxone | 6.6 Strong+ | 46 |
| 16 | Aripiprazole | 5.6 Strong | 26 |
| 17 | Tapentadol | 8.6 Intense+ | 23 |
| 18 | Pethidine | 7.6 Intense | 19 |
| 19 | Tianeptine | 5.0 Moderate+ | 17 |
| 20 | Dihydrocodeine | 6.4 Strong | 15 |
| 21 | Naltrexone | 5.1 Moderate+ | 15 |
| 22 | Butorphanol | 6.3 Strong | 12 |
| 23 | O-DSMT | 7.7 Intense | 9 |
| 24 | U-47700 | 8.0 Intense | 9 |
| 25 | Glaucine | 3.9 Moderate | 8 |
| 26 | Oxytocin | 5.1 Moderate+ | 8 |
| 27 | AH-7921 | 6.3 Strong | 6 |
| 28 | Doxylamine | 1.4 Threshold | 6 |
| 29 | Acetylfentanyl | 8.4 Intense | 5 |
| 30 | Ethylmorphine | 7.6 Intense | 4 |
| 31 | MT-45 | 6.3 Strong | 4 |
| 32 | Furanylfentanyl | 7.0 Strong+ | 3 |
| 33 | Ketobemidone | 6.3 Strong | 3 |
| 34 | Pentazocine | 5.4 Moderate+ | 3 |
| 35 | 4-Fluorobutyrfentanyl | 6.3 Strong | 2 |
| 36 | Dextropropoxyphene | 6.6 Strong+ | 2 |
| 37 | GABOB | 3.3 Light+ | 2 |
| 38 | Metonitazene | 7.6 Intense | 2 |
| 39 | Bromadol | 3.9 Moderate | 1 |
| 40 | Butyrfentanyl | 3.9 Moderate | 1 |
| 41 | Etodesnitazene | 5.1 Moderate+ | 1 |
| 42 | Salvinorin B Ethoxymethyl Ether | 5.1 Moderate+ | 1 |
| 43 | Tilidine | 5.4 Moderate+ | 1 |
| 44 | 4-Methoxybutyrfentanyl | 7.6 Intense | — |
| 45 | 4Cl-iBF | 7.0 Strong+ | — |
| 46 | 6-MAM | 7.9 Intense | — |
| 47 | 6-MDDM | 5.4 Moderate+ | — |
| 48 | 7-OH | 5.1 Moderate+ | — |
| 49 | Acetorphine | 7.9 Intense | — |
| 50 | Acetyldihydrocodeine | 7.9 Intense | — |
| 51 | Acrylfentanyl | 6.3 Strong | — |
| 52 | Agmatine | 2.4 Light | — |
| 53 | Alfentanil | 6.1 Strong | — |
| 54 | AM-2201 4-methoxynaphthyl analogue | 5.1 Moderate+ | — |
| 55 | AM-7921 | 5.1 Moderate+ | — |
| 56 | Arimistane | 2.0 Light | — |
| 57 | Benzodioxole-Fentanyl | 3.9 Moderate | — |
| 58 | Benzylfentanyl | 5.1 Moderate+ | — |
| 59 | Benzylmorphine | 5.1 Moderate+ | — |
| 60 | Beta-meprodine | 6.0 Strong | — |
| 61 | Bezitramide | 6.4 Strong | — |
| 62 | Calcitriol | 5.1 Moderate+ | — |
| 63 | Clomethiazole | 4.7 Moderate+ | — |
| 64 | Clonitazene | 5.4 Moderate+ | — |
| 65 | Cychlorphine | 7.0 Strong+ | — |
| 66 | Cyclopentyl-Fentanyl | 3.9 Moderate | — |
| 67 | Desomorphine | 6.6 Strong+ | — |
| 68 | Dextromoramide | 5.4 Moderate+ | — |
| 69 | Dipipanone | 6.3 Strong | — |
| 70 | DPP-26 | 6.3 Strong | — |
| 71 | Droxidopa | 5.1 Moderate+ | — |
| 72 | Esomeprazole | 5.1 Moderate+ | — |
| 73 | Etonitazene | 7.9 Intense | — |
| 74 | Fluoxymesterone | 5.1 Moderate+ | — |
| 75 | Glutethimide | 5.4 Moderate+ | — |
| 76 | Hydrocortisone | 5.1 Moderate+ | — |
| 77 | Hydromorphine | 5.1 Moderate+ | — |
| 78 | Hydroxychloroquine | 5.1 Moderate+ | — |
| 79 | Hydroxypethidine | 5.1 Moderate+ | — |
| 80 | Hydroxyurea | 5.1 Moderate+ | — |
| 81 | IC-26 | 5.4 Moderate+ | — |
| 82 | Imodium | 6.0 Strong | — |
| 83 | Isomethadone | 5.4 Moderate+ | — |
| 84 | Isotonitazene | 7.0 Strong+ | — |
| 85 | Isotonitazepyne | 7.3 Strong+ | — |
| 86 | Itraconazole | 5.1 Moderate+ | — |
| 87 | Ketoconazole | 5.1 Moderate+ | — |
| 88 | Lansoprazole | 5.1 Moderate+ | — |
| 89 | Levomethorphan | 7.0 Strong+ | — |
| 90 | Lofentanil | 7.0 Strong+ | — |
| 91 | Medroxyprogesterone | 5.1 Moderate+ | — |
| 92 | Methimazole | 5.1 Moderate+ | — |
| 93 | Methoxyacetyl-Fentanyl | 5.4 Moderate+ | — |
| 94 | Methoxypiperamide | 1.9 Light | — |
| 95 | Methyl-dihydro-morphine | 5.1 Moderate+ | — |
| 96 | Metronidazole | 5.1 Moderate+ | — |
| 97 | MGM-15 | 6.6 Strong+ | — |
| 98 | Morpheridine | 3.9 Moderate | — |
| 99 | Morphine-N-oxide | 5.1 Moderate+ | — |
| 100 | N-(2C)-fentanyl | 5.1 Moderate+ | — |
| 101 | N-desethyl Etonitazene | 5.1 Moderate+ | — |
| 102 | N-Desethylisotonitazene | 5.1 Moderate+ | — |
| 103 | NDP | 7.3 Strong+ | — |
| 104 | Nicomorphine | 3.9 Moderate | — |
| 105 | Norcodeine | 5.1 Moderate+ | — |
| 106 | Normorphine | 5.1 Moderate+ | — |
| 107 | Omeprazole | 5.1 Moderate+ | — |
| 108 | Oxybutynin | 5.1 Moderate+ | — |
| 109 | Pantoprazole | 5.1 Moderate+ | — |
| 110 | Parafluorofentanyl | 3.9 Moderate | — |
| 111 | Phenomorphan | 5.1 Moderate+ | — |
| 112 | Phenoxybenzamine | 5.1 Moderate+ | — |
| 113 | Phenoxymethylpenicillin | 5.1 Moderate+ | — |
| 114 | Pholcodeine | 5.1 Moderate+ | — |
| 115 | Posaconazole | 5.1 Moderate+ | — |
| 116 | Pronitazene | 6.1 Strong | — |
| 117 | PST | 5.4 Moderate+ | — |
| 118 | Rabeprazole | 5.1 Moderate+ | — |
| 119 | Racemorphan | 5.1 Moderate+ | — |
| 120 | Remifentanil | 7.6 Intense | — |
| 121 | Spirochlorphine | 7.9 Intense | — |
| 122 | SR-14968 | 6.3 Strong | — |
| 123 | SR-17018 | 4.7 Moderate+ | — |
| 124 | Sufentanil | 6.7 Strong+ | — |
| 125 | Tetrahydrofuran-Fentanyl | 5.4 Moderate+ | — |
| 126 | U-49900 | 3.9 Moderate | — |
| 127 | U-51754 | 3.9 Moderate | — |
| 128 | Valerylfentanyl | 3.9 Moderate | — |
| 129 | Voriconazole | 5.1 Moderate+ | — |
| 130 | W-15 | 5.0 Moderate+ | — |