| Drug | Effect |
| Agnus Castus | Alkaloids |
| Alfalfa | Alkaloids |
| Aniseed | Alkaloids, sympathomimetic |
| Arnica | Betaines, choline |
| Bloodroot | Alkaloids |
| Bogbean | Alkaloids |
| Boldo | Alkaloids |
| Borage | Alkaloids |
| Broom | Alkaloids, amines |
| Calamus | Amines |
| Capsicum | Sympathomimetic |
| Centaury | Alkaloids |
| Cereus | Tyramine |
| Cohosh, black | Alkaloids |
| Cohosh, blue | Alkaloids |
| Cola | Alkaloids |
| Coltsfoot | Alkaloids |
| Comfrey | Alkaloids |
| Cornsilk | Amines |
| Echinacea | Alkaloids |
| Eyebright | Alkaloids |
| Fenugreek | Choline, trigonelline |
| Fumitory | Alkaloids |
| Gentian | Alkaloids |
| Ginseng, Panax | MAOI potentiation, suspected phenelzine interaction |
