| Drug | Effect |
| Aloes | Anthraquinone constituents |
| Cascara | Anthraquinone constituents |
| Eyebright | Iridoids, in vivo |
| Frangula | Anthraquinone constituents |
| Horehound, white | Large doses |
| Ispaghula | Bulk laxative |
| Plantain | Iridoid, in vivo (much less than senna) |
| Rhubarb | Anthraquinone constituents |
| Senna | Anthraquinone constituents |
| Yellow dock | Anthraquinone constituents |
