Bronchodilators Bronchodilator: relaxes bronchial muscles, allowing easier breathingBronchodilators increase the bronchial tubes for easier breathing by relaxing the bronchial muscles. Some bronchodilators that contain atropine, like Atropa belladonna and Datura stramonium, may thicken mucous as well.Examples:Achillea millefolium (yarrow)Ammi visnaga (khella)Angelica sinensis (dong quai)Atropa belladonna (belladonna)Chelidonium majus (celandine)Datura stramonium (datura or Jimson weed)Drosera rotundifolia (sundew)Ephedra sinica (ma huang)Eriodictyon spp. (yerba santa)Inula helenium (elecampane)Ligusticum porteri (osha)Lobelia inflata (lobelia)Matricaria recutita (chamomile)Mentha piperita (peppermint)Pimpinella anisum (anise)Symplocarpus foetidus (skunk cabbage)Thymus vulgaris (thyme)Viburnum opulus (cramp bark)