| Record No. | Name | No. of Entries |
| 651 | Prestwick_129 | 1 |
| 652 | Prestwick_99 | 1 |
| 653 | Probenecid | 1 |
| 654 | PROMETH W/ CODEINE | 1 |
| 655 | Promethazine | 4 |
| 656 | Pronuciferine | 12 |
| 657 | Propain | 1 |
| 658 | Protoberberine | 1 |
| 659 | Protopine | 65 |
| 660 | Psychotrine | 4 |
| 661 | Pukateine | 2 |
| 662 | Puterine | 1 |
| 663 | Pyrimethamine & Colchicine | 1 |
| 664 | RAM-328 | 1 |
| 665 | Reticuline | 40 |
| 666 | Reticuline N-oxide | 1 |
| 667 | Reticuline,6'-methyl | 1 |
| 668 | Rhoeadine | 20 |
| 669 | Ribasine | 1 |
| 670 | Rodiasine | 1 |
| 671 | Roemerine | 2 |
| 672 | Rugosinone | 1 |
| 673 | Salsoline | 2 |
| 674 | Salsolinol | 1 |
| 675 | Salutaridine | 13 |