Ba Zheng Tang 八正湯

Clear the Heat, Open the Flow

Bā Zhèng Tāng — the Eight-Herb Decoction for Rectification, known as Let it Flow — is Si Jin Bao’s concentrated decoction of the classical Song-dynasty formula for Damp-Heat lodged in the bladder: the urgent, frequent, burning, scanty urination of Damp-Heat painful urinary dysfunction.

Recorded in the Song imperial formulary nine centuries ago, Ba Zheng San — the “Eight Corrections Powder” — assembles herbs that drain Heat and Damp downward and out through the urine, opening a urinary tract that Heat has inflamed and obstructed. Si Jin Bao renders the classical powder as a concentrated, alcohol-free decoction.

From the Song Imperial Formulary

Ba Zheng San first appears in the Tài Píng Huì Mín Hé Jì Jú Fāng — the Formulary of the Pharmacy Service for Benefiting the People in the Taiping Era — the Song dynasty’s official pharmacopeia, compiled around 1107. It was created for lin syndrome, painful urinary dysfunction, of the Damp-Heat type: Heat and Damp pouring downward into the bladder, scorching the fluids and obstructing the flow of urine.

The logic has held for nine centuries. When Heat and Damp block the lower burner, the answer is neither to force the flow nor to tonify, but to clear the Heat, drain the Damp, and open the waterways — so that what is hot and stagnant leaves the body through the urine.

Damp-Heat in the Bladder · 膀胱濕熱

The pattern is Damp-Heat pouring into the bladder and lower burner — Heat that burns and Damp that obstructs — frequently with Heat in the Heart channel transferring to the Small Intestine. Urine turns scanty, dark, and turbid; urination becomes urgent, frequent, and burning; the lower abdomen feels full and heavy.

Classical tongue & pulse: a red tongue with a greasy yellow coating; a slippery, rapid pulse.

Nine Herbs: Clear, Drain, Unblock

Mù Tōng and Huá Shí lead — Mù Tōng drains Heat from the Heart and conducts it down to the Small Intestine while freeing the flow of urine, and Huá Shí clears Heat and drains Damp through the urine. Qú Mài, Biǎn Xù, and Chē Qián Zǐ promote urination and unblock the painful, obstructed flow.

Zhī Zǐ clears Heat from all three burners and directs it downward and out through the urine; Dà Huáng drains Heat through the stool, giving the Damp-Heat a second route out of the body. Dēng Xīn Cǎo guides Heart Heat out through the urine, and Gān Cǎo harmonizes the formula, eases the urinary pain, and tempers the cold, draining herbs so the whole works as one. Clear, drain, unblock.

When to Reach for It