Dēng Xīn Cǎo (灯心草) — Juncus / Rush Pith

On this page

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

1. Overview

Dēng Xīn Cǎo (灯心草) is the dried stem pith of Juncus effusus, the soft rush. It belongs to the category of Herbs that drain Damp and clear Damp-Heat through urination in the Chinese Materia Medica and is one of the gentlest Heart-Fire-clearing herbs in Chinese herbal medicine. Its mild nature makes it particularly suited to children with restless sleep and irritability.

I prescribe Dēng Xīn Cǎo as part of bespoke herbal formulas from pharmaceutical-grade granules sourced from Sun Ten in Taiwan.

2. Properties

3. Actions and indications

Principal actions

1. Clears Heart Fire gently
2. Promotes urination and clears Damp-Heat from the lower burner

Indications

1. Restlessness, crying and disturbed sleep in children from Heart Fire
2. Mouth ulcers and tongue ulcers in adults from Heart Fire descending to the Small Intestine
3. Hot painful scanty urination

4. Modern research

Juncus pith contains phenanthrene derivatives (juncusol, dehydrojuncusol), flavonoids and lignans. Studies report mild sedative, antimicrobial and anti-inflammatory effects. The herb has an excellent safety record across centuries of use, including in paediatric practice.

5. Incompatibilities

Dēng Xīn Cǎo (灯心草) Juncus / Rush 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.

6. Cautions and contraindications

Very well tolerated. Use with caution in patients with weak Spleen Qi and chronic loose stools (although the diuretic action is mild).

Pattern contraindications

Contraindicated in Yin and Blood deficiency — promoting urination depletes fluids further. Use cautiously in spermatorrhoea and excessive urination.

Modern drug interactions

Diuretic herbs have an additive effect with conventional diuretics and can deplete potassium with long-term use — review with your GP if you take loop or thiazide diuretics, ACE inhibitors, ARBs or lithium.

Important: Chinese herbs should always be prescribed by a fully qualified herbalist who is a member of the Register of Chinese Herbal Medicine (RCHM).

7. Treatment at my clinic

I prescribe Dēng Xīn Cǎo as part of tailored herbal formulas for children’s restlessness and disturbed sleep, gentle adjunctive support in Heart-Fire patterns, and mild urinary irritation. Every prescription is individually formulated following a full TCM assessment.

I see patients in person at my clinic in Wokingham, Berkshire. Online Chinese herbal medicine consultations are available.

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