Amor seco refers to several plant species, most commonly Desmodium adscendens or Desmodium incanum, used in traditional medicine throughout Latin America, the Caribbean, and parts of Africa. The use of Amor seco for bronchial congestion appears largely rooted in ethnomedical practices. Traditional healers have used decoctions or infusions of the leaves, stems, or whole plant to treat respiratory ailments, including bronchitis, asthma, and congestion. These uses are documented in several ethnobotanical surveys and compendiums of folk medicine, particularly in South America and West Africa.

The rationale for these uses is primarily based on anecdotal evidence and longstanding traditional knowledge. Some phytochemical studies of Desmodium species reveal the presence of flavonoids, alkaloids, and saponins, compounds which could theoretically have anti-inflammatory or antispasmodic effects, potentially offering relief in respiratory conditions. However, direct scientific validation—such as controlled clinical trials or robust pharmacological studies specifically focused on bronchial congestion—is lacking. The available evidence is mostly preclinical or linked to related conditions (e.g., asthma models in animals).

In summary, the use of Amor seco for bronchial congestion is justified by traditional medicine rather than scientific consensus. While some preliminary phytochemical and pharmacological findings may be encouraging, they do not yet substantiate its efficacy or safety for this specific indication.