Daurian Rhododendron Oil

Chinese
满山红油
Pinyin
Man Shan Hong You
Latin
Oleum Rhododendri Daurici

TCM Properties

Taste
acrid
Temperature
cool
Channels
Lung

Traditional Use

Primary Actions

  • Stops cough and transforms phlegm - Man Shan Hong You is the concentrated volatile-oil preparation made from Man Shan Hong leaves and is used for productive cough with bronchial irritation.
  • Benefits acute and chronic bronchitis - modern Chinese materia medica and pharmacopoeial use centers on bronchitic cough rather than on broad general herbal indications.
  • Opens constrained Lung Qi - the penetrating aromatic oil is used when sticky phlegm and cough obstruction are difficult to clear with milder preparations.

Secondary Actions

  • This record represents the distilled oil, not the crude leaf, so it belongs more to a standardized medicinal preparation tradition than to ordinary decoction use.
  • Compared with the leaf, Man Shan Hong You is narrower in indication but more concentrated in delivery.

Classic Formulas

  • Man Shan Hong You capsules or pills - the standard finished-product form for acute and chronic bronchitic cough.
  • Man Shan Hong You derived from steam-distilled leaf preparations - a preparation-based respiratory approach rather than a broad classical decoction tradition.
  • Adjunct use with the crude Man Shan Hong leaf tradition - the oil preparation preserves the same cough-phlegm treatment direction in more concentrated form.

Classical References

  • Chinese pharmacopoeial usage describes Man Shan Hong You as the volatile oil obtained by steam distillation of Rhododendron dauricum leaves and used for cough and expectoration.
  • The preparation is aimed mainly at acute and chronic bronchitis rather than at the wider folk indications sometimes attached to the leaf herb itself.
  • PREPARATION NOTE: this file intentionally distinguishes the oil from herb #303 because the distilled oil is a separate medicinal product with a narrower respiratory focus.

Modern Research

Active Compounds

  • Volatile terpene-rich essential-oil fraction - the defining medicinal portion of Man Shan Hong You
  • Aromatic monoterpene and sesquiterpene constituents - the main class of compounds expected in the distilled oil
  • Leaf-associated flavonoid background chemistry such as farrerol and quercetin - important to the broader Man Shan Hong source literature even when not all are carried into the oil fraction

Studied Effects

  • Direct PubMed literature on the finished oil preparation is limited, but broader Rhododendron dauricum leaf research supports the antitussive and bronchitis-oriented tradition from which the oil is derived (PMID 36584919).
  • Analytical profiling of Rhododendron dauricum leaves identified multiple bioactive constituents that help explain why concentrated leaf-derived preparations remain in respiratory use (PMID 26154189).
  • The best modern interpretation is that Man Shan Hong You is a focused pharmacopeial respiratory preparation whose practical identity rests more on standardized manufacture and traditional bronchitis use than on large standalone clinical trials.

PubMed References

Safety & Interactions

Contraindications

  • Dry cough from yin deficiency without phlegm
  • Known sensitivity to concentrated aromatic oils

Cautions

  • As a concentrated volatile-oil preparation, Man Shan Hong You is more irritating than the crude leaf and should be used only in standardized medicinal forms.
  • The preparation is intended for productive bronchitic cough and may aggravate dry, depleted, or nonphlegmy respiratory irritation.
  • Improvised essential-oil use from nonstandard sources is not equivalent to medicinal-grade Man Shan Hong You.
  • MSK page not found - drug interaction data not available from Memorial Sloan Kettering integrative medicine database

Conditions