| Similarity | Rank | |
|---|---|---|
| LORTAB | 0.972 | 43915 |
| PERCOCET | 0.972 | 44796 |
| OXYCONTIN | 0.971 | 53820 |
| HYDROCODONE | 0.970 | 38109 |
| VICODIN | 0.969 | 44698 |
| METHADONE | 0.959 | 44502 |
| MORPHINE | 0.950 | 61554 |
| XANAX | 0.948 | 44454 |
| VALIUM | 0.948 | 43351 |
| CARISOPRODOL | 0.947 | 47824 |
| PROPOXYPHENE | 0.945 | 66758 |
| PERCODAN | 0.945 | 70179 |
| ADDERALL | 0.943 | 41836 |
| DARVON | 0.943 | 90925 |
| CODEINE | 0.941 | 30981 |
| FLEXERIL | 0.939 | 81212 |
| FIORICET | 0.939 | 49676 |
| ULTRACET | 0.935 | 92923 |
| ULTRAM | 0.934 | 42384 |
| TRAMADOL | 0.933 | 35975 |
| LORCET | 0.933 | 78525 |
| NORCO | 0.931 | 45727 |
| TUSSIONEX | 0.931 | 70426 |
| BUTALBITAL | 0.931 | 50181 |
| KLONOPIN | 0.930 | 55427 |