The word decongestant refers to therapeutic agents - including natural substances such as herbs, oils, or essences, or conventional pharmaceutical drugs, that relieve and/or reduce congestion such as mucus in the respiratory system. Sometimes the word decongestant is used to refer to relieving specifically nasal congestion.
Most allopathic decongestant drugs are sympathomimetic* drugs (typically in the form of drops, tablets or spays).
The definitions in this section are of words used to refer to the actions (effects) of both pharmaceutical drugs and natural remedies. For information about specific oils, herbs, and remedies that might have properties including some of the actions mentioned in this section, see other parts of this website. For example, the pages about Aromatherapy Essential Oils, Bach Flower Remedies, Herbalism, Homeopathic Remedies, Homeopathy and Massage Carrier Oils.