| Drug | Effect |
| Calamus | Potentiation barbituate sleeping time |
| Celery | In vivo |
| Chamomile, German | Human |
| Couchgrass | In vivo |
| Elecampane | In vivo |
| Ginseng | CNS depressant and stimulant |
| Goldenseal | In vivo |
| Hops | In vivo |
| Hydrocotyle | In vivo |
| Jamaica Dogwood | In vivo |
| Nettle | CNS depression, in vivo |
| Passionflower | In vivo |
| Sage | In vivo |
| Scullcap | Reputed action |
| Shepherd's Purse | Potentiation barbituate sleeping time |
| St. John's Wort | Traditional use, bioflavonoids |
| Valerian | Human, in vivo |
| Wild carrot | In vivo |
| Wild lettuce | In vivo, related species |
