Tōng Cǎo (通草) — Rice Paper Plant pith / Medulla Tetrapanacis

On this page

1. Overview
2. Properties
3. Actions and indications
4. Key formulas
5. Modern research
6. Incompatibilities
7. Cautions and contraindications
8. Treatment at my clinic

1. Overview

Tōng Cǎo (通草) — Tetrapanax papyriferus — is known as Rice Paper Plant pith or Medulla Tetrapanacis. It belongs to the category of Herbs that drain Dampness through urination in the Chinese Materia Medica and is widely used in traditional Chinese medicine (TCM). Tong Cao is light, gentle and unblocking, traditionally used for Damp-Heat in the lower burner, insufficient lactation in nursing mothers and for unblocking the channels in cold-extremity presentations.

I prescribe Tōng Cǎo as part of bespoke herbal formulas from pharmaceutical-grade granules sourced from Sun Ten in Taiwan. Herbs are always combined with other herbs selected to match the patient’s individual TCM pattern. Online consultations are available for patients who cannot attend my clinic in person.

2. Properties

3. Actions and indications

Principal actions

1. Promotes urination and clears Damp-Heat from the lower burner — the principal action
2. Promotes lactation in nursing mothers with insufficient milk supply
3. Vents Heat through the surface, particularly in Damp-Heat patterns with low-grade fever
4. Unblocks the channels and collaterals — used in formulas warming the channels of the extremities

Indications

1. Painful urinary dysfunction with scanty, dark, hot urine (Damp-Heat in the bladder)
2. Oedema and urinary retention from Damp accumulation
3. Insufficient lactation post-partum — the classical indication; often combined with Wang Bu Liu Xing
4. Low-grade fever with Damp-Heat in the middle and lower burners
5. Cold hands and feet (cold extremities) from Blood deficiency with Cold in the channels — in Dang Gui Si Ni Tang
6. Damp-Heat skin presentations with scanty urination

4. Key formulas containing Tōng Cǎo

Tōng Cǎo appears in the following classical Chinese herbal formulas:

• Dang Gui Si Ni Tang — warms the channels and nourishes Blood for cold extremities from Blood deficiency with Cold invading the channels
• San Ren Tang — clears Damp-Heat from all three burners, particularly the upper
• Xing Ren Hua Shi Tang — drains Damp-Heat from the three burners with attention to the lower burner
• Xie Qing Wan — used as a safe modern substitution for Mu Tong (which has been associated with aristolochic acid toxicity in the Guan Mu Tong species)

See the full Chinese herbal medicine formula directory for detailed information on all classical formulas.

5. Modern research

Modern pharmacological research on Tong Cao is limited compared with major Chinese herbs, but established constituents include polysaccharides, sterols and small amounts of saponins. The pith’s gentle diuretic action has been documented in animal models. As a galactagogue (lactation-promoting herb), Tong Cao’s traditional use is widely supported in modern Chinese clinical practice for post-partum hypogalactia, typically combined with Wang Bu Liu Xing (vaccaria seed) for synergistic effect.

Importantly, Tong Cao is one of the herbs that modern pharmacy substitutes safely for the now-restricted Guan Mu Tong (Aristolochia manshuriensis), which contains aristolochic acid associated with nephrotoxicity and urothelial carcinogenesis. Tong Cao does NOT contain aristolochic acid and is safe for short-to-medium-term use under qualified herbalist supervision.

6. Incompatibilities

Tōng Cǎo (通草) Rice Paper Plant pith is not listed in either of the two classical incompatibility texts — Shi Ba Fan (Eighteen Antagonisms) or Shi Jiu Wei (Nineteen Mutual Inhibitions). As with every Chinese herb it should be prescribed only as part of a balanced formula by a registered Chinese herbalist (RCHM), who will check for interactions with any other herbs and prescription medications you are taking.

7. Cautions and contraindications

Use with caution during pregnancy — Tong Cao has a mild downward-draining action that has historically been considered inappropriate in pregnancy. Avoid in patients with frequent urination, spermatorrhoea or cold-pattern urinary symptoms. Avoid in patients with Yin deficiency without Damp-Heat, as continued diuretic action will further deplete fluids.

Pattern contraindications

Contraindicated in cold-pattern urinary frequency, in Yin and Blood deficiency without Damp-Heat overlay, and in early pregnancy. Use cautiously in elderly patients with reduced renal function.

Modern drug interactions

Diuretic herbs have an additive effect with conventional diuretics and can deplete potassium with long-term use — review with your doctor if you take loop or thiazide diuretics, ACE inhibitors, ARBs or lithium. The galactagogue effect should be coordinated with the prescribing midwife or lactation consultant if the patient is breastfeeding.

Important: Chinese herbs should always be prescribed by a fully qualified herbalist who is a member of the Register of Chinese Herbal Medicine (RCHM). Never self-prescribe or self-administer Chinese herbs without professional guidance. Dr (TCM) Attilio D’Alberto is a member of the RCHM with over 25 years of clinical experience.

8. Treatment at my clinic

I prescribe Tōng Cǎo as part of tailored herbal formulas for a range of conditions including post-partum lactation difficulties, urinary tract infections with Damp-Heat, oedema and cold-extremity presentations such as Raynaud’s disease. Every prescription is individually formulated following a full TCM assessment and adjusted throughout treatment as the pattern responds.

I see patients in person at my clinic in Wokingham, Berkshire. Online Chinese herbal medicine consultations are available throughout the UK and internationally. Visit the prices page for consultation fees.

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Prefer to be treated from home? Chinese herbal medicine online consultations are available throughout the UK and worldwide. After a full video consultation, Dr (TCM) Attilio D'Alberto formulates a bespoke herbal prescription and posts your Chinese herbs directly to your door.