| 1 | Medline Plus Has extensive information about drugs, an illustrated medical encyclopedia, interactive patient tutorials, and latest health news. | 398 |
| 2 | Office of National Drug Control Policy Whitehouse drugs policy | 360 |
| 3 | INCB - International Narcotics Control Board Independent and quasi-judicial monitoring body for the implementation of the United Nations international drug control conventions. | 371 |
| 5 | EMCDDA - European Monitoring Centre for Drugs and Drug Addiction Central source of comprehensive information on drugs and drug addiction in Europe. | 323 |