What is Zhi Gan Cao Tang used for?

Zhi Gan Cao Tang is primarily used for irregular pulse, palpitations, and heart rhythm disturbances caused by Qi and Blood deficiency with Yin damage. In modern TCM, it is applied to arrhythmias, premature ventricular contractions, and other cardiac conditions where the heart muscle is weakened and undernourished.

Why does this formula use so much Zhi Gan Cao (honey-fried licorice)?

Zhi Gan Cao (honey-fried licorice) tonifies Spleen Qi, nourishes the Heart, and harmonizes the formula — and in this context, it is used in unusually large doses (12-30g). Its sweet nature directly tonifies Qi, and the honey-frying gives it warming, nourishing properties that support the Heart muscle. It serves as both the chief herb and the formula's namesake.

Zhi Gan Cao Tang (炙甘草汤): Honey-Fried Licorice Decoction for Irregular Pulse and Heart Health

What Is Zhi Gan Cao Tang?

Zhi Gan Cao Tang (炙甘草汤), the “Honey-Fried Licorice Decoction,” is one of the most important formulas in the Shanghan Lun (Treatise on Cold Damage) by Zhang Zhongjing. Also known as Fu Mai Tang (复脉汤, “Pulse-Restoring Decoction”), it is the definitive TCM formula for treating irregular pulse, palpitations, and heart rhythm disturbances.

The formula addresses a specific pattern: Qi and Blood deficiency with Yin damage causing the Heart to be undernourished and the pulse to become irregular — what TCM calls “prominent pulse with间歇” (intermittent pulse).

The Ingredients

Herb	Chinese	Dose	Role
Honey-fried Licorice	Zhi Gan Cao (炙甘草)	12-30g	Chief — tonifies Qi, nourishes Heart, restores pulse
Rehmannia	Sheng Di Huang (生地黄)	15-30g	Deputy — nourishes Blood and Yin
Ginseng	Ren Shen (人参)	6-9g	Deputy — tonifies primal Qi
Dong Quai	Dang Gui (当归)	6-9g	Deputy — nourishes Blood
Ophiopogon	Mai Men Dong (麦门冬)	9-12g	Deputy — nourishes Heart Yin, generates fluids
Hemp Seed	Huo Ma Ren (火麻仁)	9-12g	Assistant — moistens intestines, nourishes Yin
Jujube	Da Zao (大枣)	10 pieces	Assistant — tonifies Spleen, nourishes Blood
Fresh Ginger	Sheng Jiang (生姜)	3-5 slices	Assistant — warms middle, harmonizes

Cinnamon Twig | Gui Zhi (桂枝) | 6-9g | Assistant — warms Yang, moves Qi through vessels |
Rice Wine | Qing Jiu (清酒) | 200-300ml | Vehicle — enhances circulation of tonifying herbs |

This is a large formula — ten ingredients working together to simultaneously tonify Qi, nourish Blood, moisten Yin, and gently warm Yang. The addition of rice wine as a cooking medium is unique and clinically significant: wine enhances the circulation of the tonifying herbs so they reach the Heart effectively.

How It Works

The Problem: Heart Undernourished

In TCM, the Heart depends on three things for proper rhythm:

Heart Qi — provides the driving force (the “pump”)
Heart Blood — nourishes the heart muscle
Heart Yin — provides the moistening and cooling that prevents irregular firing

When all three are deficient — often after a prolonged illness, severe bleeding, or chronic overwork — the Heart cannot maintain a regular rhythm. The pulse becomes intermittent (stops and starts), and the patient experiences palpitations.

The Solution: Nourish Everything

Qi deficiency → Ren Shen + Zhi Gan Cao (tonify Qi)
Blood deficiency → Sheng Di Huang + Dang Gui + Da Zao (nourish Blood)
Yin deficiency → Sheng Di Huang + Mai Men Dong + Huo Ma Ren (nourish Yin)
Yang not moving → Gui Zhi + Sheng Jiang + Rice Wine (warm and circulate)

The genius of this formula is that it tonifies without creating stagnation — the warming and circulating herbs (Gui Zhi, ginger, wine) ensure the heavy tonifying herbs actually reach the Heart rather than stagnating in the digestive system.

Primary Indications

Classic Signs

Irregular or intermittent pulse (促脉 or 结脉) — pulse that skips beats
Palpitations — feeling the heart pounding or fluttering
Shortness of breath with slight exertion
Fatigue and weakness
Dry mouth and throat (Yin deficiency)
Insomnia and restlessness
Tongue: Pale or slightly red with little coating
Pulse: Irregular, fine, or deficient

Modern Clinical Applications

Cardiac arrhythmias — premature ventricular contractions (PVCs), atrial fibrillation
Myocardial damage — after viral myocarditis or heart attack recovery
Heart failure (mild to moderate, as supportive therapy)
Hyperthyroidism with irregular pulse and palpitations
Post-viral heart inflammation
Chemotherapy-induced cardiac damage (research area)

Important Variations

With added Bai Zi Ren and Suan Zao Ren

For severe insomnia with palpitations — adds Heart-calming seeds.

With added Dan Shen and Chuan Xiong

For irregular pulse with blood stasis — adds blood-invigorating herbs. This is very common in modern practice, as chronic heart conditions often involve stasis.

Without Rice Wine

For patients who cannot tolerate alcohol — the formula is still effective but may be slightly less potent in circulating the tonifying herbs.

Dosage and Preparation

Traditional Decoction Method

Crush Sheng Di Huang and soak all herbs for 30 minutes
Add rice wine and water (traditional: 7 parts wine to 8 parts water)
Bring to a boil, then simmer for 40-50 minutes
Strain and take warm, divided into 2-3 doses per day

Modern Adaptation

If rice wine is unavailable, substitute with warm water and add 1-2 tablespoons of cooking wine
Granule forms are available but may be less effective due to the wine component
Treatment course: typically 2-4 weeks, then reassess

Precautions

Damp-phlegm conditions — the rich, tonifying nature may worsen phlegm and dampness
Excess heat patterns — the warming herbs may aggravate true excess heat
Spleen deficiency with severe dampness — the heavy tonifying herbs may be hard to digest
Patients on cardiac medications — must be supervised by both TCM practitioner and cardiologist
Not for acute heart conditions — this is a nourishing, restorative formula for chronic patterns

Key Takeaways

Zhi Gan Cao Tang is Zhang Zhongjing’s classic formula for irregular pulse and palpitations from Qi-Blood-Yin deficiency
Uses honey-fried licorice in large doses as the chief herb — hence the name
Uniquely uses rice wine as the cooking medium to enhance circulation of tonifying herbs
Modern applications include arrhythmias, myocarditis recovery, and chemotherapy-induced heart damage
A formula that tonifies Qi, Blood, and Yin simultaneously while ensuring they reach the Heart

Disclaimer: This article is for educational purposes only. Heart conditions require medical supervision. Do not discontinue prescribed cardiac medications without consulting your cardiologist.