Chinese Caterpillar Fungus Classic Formulas

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Tonifies Kidney Yang and supports essence - Dong Chong Xia Cao is prized for chronic weakness with sore low back and knees, impotence, seminal leakage, cold fatigue, or slow post-illness recovery when Kidney depletion sits at the root.
Nourishes the Lungs and calms wheezing - it is especially valued when chronic cough, dyspnea on exertion, weak respiration, or recurrent wheezing reflect Lung-Kidney deficiency rather than acute excess heat.
Stops bleeding and transforms phlegm in consumptive cough - classical doctors used it for longstanding dry or weak cough with blood-streaked sputum, seeing the bleeding as part of a deeper Lung-Kidney deficiency pattern.
Provides a rare balanced tonic action across Yin and Yang aspects of deficiency - unlike strongly heating Yang tonics, it is often chosen when weakness, cough, and sexual or renal depletion coexist without wanting to over-dry the patient.

Ren Shen Lu Rong Tang modifications (人参鹿茸汤加冬虫夏草) - used when deep deficiency includes fatigue, cough, sexual weakness, and cold low-back soreness requiring both Qi support and Lung-Kidney reinforcement.
Qi Wei Du Qi Wan modifications (七味都气丸加冬虫夏草) - adds Dong Chong Xia Cao when standard Kidney grasping-Qi support is not enough for chronic dyspnea and breathlessness from Lung-Kidney depletion.
Deficiency-cough tonics with Ge Jie or Ren Shen - common pairing logic for chronic wheezing, cough with weakness, and post-illness debility when both respiration and Kidney essence need support.

Me and Qi describes Dong Chong Xia Cao as one of Chinese medicine's prized tonics that strengthens the Kidney and nourishes the Lungs for fatigue, cough, breathlessness, lower-back weakness, and recovery from prolonged illness.
The same source notes a source disagreement over temperature, describing its nature as neutral to slightly warm while still emphasizing Kidney-Yang support and Lung-Yin nourishment together.
Classical quotations preserved by Me and Qi include Ben Cao Cong Xin and Yao Xing Kao, which credit Dong Chong Xia Cao with benefiting the Lung and Kidney, stopping bleeding, transforming phlegm, and strongly supplementing essence and Qi.