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©2013 UpToDate ® Print Email Potentially allergenic herbal ingredients 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 Adapted with permission from Newall CA, Anderson LA, Phillipson JD. Herbal Medicines: A Guide for Health-Care Professionals, The Pharmaceutical Press, London 1996, p.284.