Zhi Shi (枳实) — Immature Bitter Orange TCM Herb | Qi Stagnation, Constipation & Prolapse

At a Glance

• Herb: Zhi Shi
• Chinese name: 枳实 (Zhǐ Shí)
• Latin name: Fructus Aurantii Immaturus
• Nature: Slightly Cold
• Taste: Bitter / Acrid / Sour
• Meridian: Spleen / Stomach / Large Intestine
• Category: Herbs that Regulate Qi
• Introduction: Zhi Shi (枳实, Fructus Aurantii Immaturus) is the dried immature fruit of Citrus aurantium L. or C. sinensis Osbeck, harvested when the diameter is 0.5–2.5 cm — the hard, unripe green fruit that concentrates the bitterest and most potent qi-moving constituents. First recorded in the Shennong Bencao Jing, Zhi Shi is the most powerful qi-regulating, accumulation-breaking herb in the Spleen-Stomach-Intestine category. Its bitter, forceful descending action breaks up hardened masses — food stagnation, phlegm accumulation, and qi obstruction — making it appropriate for excess patterns where urgent descent is needed. It is distinguished from its near-relative Zhi Ke (枳壳, the ripe fruit peel) by being smaller, harder, more concentrated in alkaloids, and considerably more potent and forceful in action.

Action

• Breaks up qi stagnation and reduces accumulation: The strongest herb for breaking up solid qi and food accumulations — treats epigastric and abdominal hardness, distension, and pain. 2. Transforms phlegm and removes fullness: Dissolves phlegm accumulations causing chest and epigastric oppression and fullness. 3. Promotes bowel movement and removes stagnation: Descends Large Intestine qi to relieve constipation from qi stagnation — combined with Da Huang in Cheng Qi Tang formulas. 4. Resolves organ prolapse (modern application): Raises organ tone — used for gastroptosis, uterine prolapse, and rectal prolapse.

Clinical Application

• Zhi Shi is indispensable in excess patterns of the Spleen, Stomach, and Large Intestine. In Da Cheng Qi Tang (大承气汤) with Da Huang, Mang Xiao, and Hou Po, it drives urgent purgation of yang-ming bowel excess. In Zhi Shi Dao Zhi Wan (枳实导滞丸) it treats damp-heat food stagnation causing diarrhea. In Zhi Shi Xie Bai Gui Zhi Tang from the Jin Gui Yao Lue, it descends qi to treat chest Bi (xiong bi) from phlegm and qi obstruction. The modern clinical application for organ prolapse (gastroptosis) — paradoxically using a descending herb for prolapse — is explained by its ability to increase smooth muscle tone and restore proper contractile pressure. Bran-roasted Zhi Shi (Fu Chao Zhi Shi) has milder action and is preferred when the Spleen is deficient.

Precautions

• Use with caution in pregnancy — strong descending action may cause miscarriage. Avoid in Spleen-Stomach deficiency without stagnation. Use with caution in hypertension and cardiac arrhythmia (synephrine content). Bran-roasted form (Fu Chao Zhi Shi) preferred for deficiency with stagnation. Distinguish from Zhi Ke (枳壳, ripe fruit peel): Zhi Shi is stronger and descends; Zhi Ke is milder and acts more in the chest and upper abdomen.

Formula

• Da Cheng Qi Tang (大承气汤): Da Huang, Mang Xiao, Zhi Shi, Hou Po.
• Xiao Cheng Qi Tang (小承气汤): Da Huang, Zhi Shi, Hou Po.
• Zhi Zhu Wan (枳术丸): Zhi Shi, Bai Zhu — Spleen deficiency with food stagnation.
• Zhi Shi Xie Bai Gui Zhi Tang (枳实薤白桂枝汤): Zhi Shi, Xie Bai, Gui Zhi, Gua Lou, Hou Po.

Combinations

• Zhi Shi + Da Huang + Mang Xiao + Hou Po (Da Cheng Qi Tang): Yang-ming excess constipation with hard stool, abdominal fullness, high fever. Source: Shang Han Lun (伤寒论).
• Zhi Shi + Bai Zhu (Zhi Zhu Wan): Spleen deficiency with food stagnation — tonifies and moves simultaneously. Source: Medical Formulas Collected and Analyzed (医方集解).
• Zhi Shi + Gua Lou + Xie Bai + Gui Zhi (Zhi Shi Xie Bai Gui Zhi Tang): Chest Bi from phlegm-qi obstruction with chest pain. Source: Jin Gui Yao Lue (金匮要略).
• Zhi Shi + Huang Lian + Da Huang + Shen Qu (Zhi Shi Dao Zhi Wan): Damp-heat food stagnation with diarrhea. Source: Spleen-Stomach Theory (脾胃论).
• Zhi Shi + Hou Po + Chen Pi (San Zi): Qi stagnation with epigastric fullness, bloating, and constipation. Source: Classical qi-moving formula tradition.

Pharmacological Effects

• Synephrine
  • Prokinetic / smooth muscle stimulant: stimulates alpha-adrenergic receptors, increasing intestinal smooth muscle tone and contractility — promotes gastric emptying and intestinal transit
  • Prokinetic / smooth muscle stimulant: supports use for constipation and gastroptosis
  • Cardiovascular: increases cardiac output and blood pressure — use with caution in hypertensive patients
• Naringenin and hesperidin
  • Anti-inflammatory: inhibit NF-κB and COX-2
• Choleretic
  • Increases bile flow and gallbladder contraction
• Limonoids
  • Anti-tumour: show anti-proliferative activity in breast and colon cancer cell lines

Classic Description

• 《神农本草经》(Shennong Bencao Jing, circa 200 CE): ‘枳实，味苦，寒。主大风在皮肤中如麻豆苦痒，除寒热结，止痢，长肌肉，利五脏，益气轻身。’ (Zhi Shi: bitter flavour, cold. Governs great wind in the skin causing itching like hemp seeds; eliminates cold-heat binding, stops dysentery, grows flesh, benefits the five organs, benefits qi, lightens the body.)
• 《伤寒论》(Shang Han Lun, circa 200 CE): ‘大下后，六七日不大便，烦不解，腹满痛者，此有燥屎也，宜大承气汤。’ (After major purgation, no defecation for six or seven days, vexation unresolved, abdominal fullness and pain — there is dry stool. Da Cheng Qi Tang is appropriate.)
• 《本草纲目》(Bencao Gangmu, 1596): ‘枳实、枳壳，气味功用俱同，上世亦无分别，魏晋以来，始分小者为枳实，大者为枳壳，主治虽同，大略实主下，壳主上。’ (Zhi Shi and Zhi Ke share the same qi, flavour and functions — earlier ages made no distinction. Since the Wei-Jin period the smaller was classified as Zhi Shi and the larger as Zhi Ke. Though indications are similar, broadly Zhi Shi governs descent and Zhi Ke governs the upper.)