Blackend Swallowwort Root Classic Formulas

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Clears deficiency heat and cools the Blood - classically used for lingering low-grade fever, postpartum or late-stage febrile disease, and steaming-bone or hidden heat patterns arising from yin-blood depletion.
Clears heat from the nutritive level without trapping pathogens - especially valued after febrile disease when heat remains but the patient is already depleted and cannot tolerate harsh draining herbs.
Promotes urination and unblocks painful urinary difficulty - extended to heat-type strangury or fluid obstruction when internal heat agitates the lower burner.
Resolves toxin and benefits the throat - used for sore throat, carbuncles, and toxic swellings when heat toxin combines with blood-level irritation.

Bai Wei Tang (白薇汤) - traditional formula lineage for postpartum or deficiency-complicated heat patterns, using Bai Wei to clear hidden heat without overly damaging the weakened patient.
Qian Jin Wei Rui Tang (千金葳蕤汤) - from Qian Jin Fang, where Bai Wei helps address lingering heat and dryness after externally contracted illness in weakened patients.

Shen Nong Ben Cao Jing records Bai Wei for violent heat, body heat, and stubborn heat disorders, establishing its role in clearing hidden or chronic heat.
Me and Qi and TCM Wiki describe Bai Wei as bitter, salty, and cold, entering the Liver, Stomach, and Kidney channels and treating deficiency heat, postpartum fever, painful urinary disorders, and toxic swellings.
IMPORT NOTE: The English slug reflects an awkward spreadsheet translation, but the herb itself is the standard medicinal Bai Wei.