| Drug | Effect |
| Agnus Castus | Allergic effects reported |
| Angelica | Furanocoumarins, photosensitivity, contact allergy |
| Aniseed | Furanocoumarins, photosensitivity, contact allergy |
| Apricot | Contact allergy, kernels |
| Arnica | Contact allergy |
| Artichoke | Sesquiterpene lactone constituents |
| Asafoetida | Irritant gum, contact allergy |
| Boneset | Sesquiterpene lactone constituents |
| Cassia | Allergic reactions, mainly contact |
| Celery | Furanocoumarins, photosensitivity |
| Chamomile, German | Sesquiterpene lactone constituents |
| Chamomile, Roman | Sesquiterpene lactone constituents |
| Cinnamon | Contact allergy |
| Cornsilk | Allergic reactions |
| Cowslip | Allergic reactions |
| Dandelion | Sesquiterpene lactone constituents |
| Elecampane | Sesquiterpene lactone constituents |
| Euphorbia | Histamine potentiating properties |
| Feverfew | Sesquiterpene lactone constituents |
| Fucus | Iodine may aggravate/trigger acne |
| Garlic | Sulphur-containing compounds, allergic reaction |
| Gravel root | Sesquiterpene lactone constituents |
| Guaicum | Irritant resin |
| Holy Thistle | Sesquiterpene lactone constituents |
| Hops | Contact allergy |
| Hydrangea | Contact allergy |
| Hydrocotyle | Photosensitivity |
| Juniper | Contact allergy |
| Lady's Slipper | Contact allergy |
| Meadowsweet | Potentiation of histamine bronchospastic properties |
| Motherwort | Dermatitis, photosensitization |
| Parsley | Furanocoumarins, photosensitivity |
| Pilewort | Contact allergy |
| Plantain | Contact allergy |
| Pleurisy root | Contact allergy |
| Pulsatilla | Contact allergy, protoanemonin |
| Rosemary | Dermatitis, photosensitization |
| St. Johns' Wort | Photodermatitis, hypericin |
| Tansy | Sesquiterpene lactone constituents |
| Wild carrot | Furanocoumarins, photosensitivity |
| Yarrow | Sesquiterpene lactone constituents |
