Pinyin: Shi Gao  Chinese: 石膏
Pharmaceutical: Gypsum Fibrosum / Calcium Sulphate
Taxonomy: CaSO₄
English: Gypsum / Plaster of Paris

Tastes: Pungent, sweet, cold
Meridians Entered: Lung and Stomach

Actions & Indications:

1. Clears Heat in the Qi Stage, drains Fire, relieves irritability and quenches thirst
   Heat in the Qi Stage or Yangming Heat with high fever, no chills, irritability, intense thirst, profuse sweating, restlessness, encephalitis, a flooding, big pulse and a red tongue with a yellow coat
2. Clears Excess Heat from the Lungs
   Lung Heat with cough, wheezing, fever and a thick viscous sputum
3. Clears Blazing Stomach Fire
   Stomach Fire with headache, toothache or swollen gums
4. Heals eczema, burns and ulcerated sores and wounds
   Sores and wounds (topically or internally)

Standard Dosage: 15-60g in decoction.
Cautions: Mineral products are prohibited from use in the UK under the Medicines Act 1968 ch. 67 which restricts herbalists to the use of plant products only.

Conventional replacements include Huang Lian and Zhi Mu but its actions are difficult to substitute in many cases and the patient may have to rely on OTC mineral based antacids from the pharmacy such as sodium bicarbonate and calcium carbonate which have a similar effect of binding and neutralising the stomach acid, then using herbal medicines as an adjunctive treatment. Another possibility would be to use sodium alginate that is often found in antacid medications and extracted from seaweed.

Pinyin: Qing Fen  Chinese: 輕粉
Pharmaceutical: Calomelas
Taxonomy: Hg₂Cl₂
English: Calomel

Tastes: Pungent, cold, toxic
Meridians Entered: Large Intestine and Small Intestine

Actions & Indications:

1. Strongly kills parasites, generates flesh and promotes the healing of sores
   Skin parasites and fungal infections of the skin Sores that have turned into non-healing ulcers
2. Resolves toxicity and kills parasites
   As an external wash for scabies, rosacea and syphilitic chancres
3. Expels water and unblocks the bowels and bladder
   Internally for patterns of Excess with oedema, urinary retention and constipation

Standard Dosage: Traditionally 0.1-0.2g for internal use. No dose is considered acceptable today.
Cautions: Being toxic (it can induce hydrargyria or mercury poisoning) it should no longer be used. Traditional use acknowledges its toxicity with cautions for internal application, and that it be gargled after administration. It is contraindicated for weak people and pregnant women. For external application, it should never be overdosed or for persistent use.

Pinyin: Huang Bai  Chinese: 黄柏
Pharmaceutical: Cortex Phellodendri
Taxonomy: Phellodendron amurense seu chinense
English: Amur Corktree Bark

Tastes: Bitter, cold
Meridians Entered: Liver, Gallbladder, Large Intestine, Kidney and Bladder

Actions & Indications:

1. Drains Damp-Heat especially from the Lower Jiao
   Thick, yellow vaginal discharge, foul smelling diarrhoea or dysenteric disorder
   Damp-Heat in the Lower Jiao
   Hot Leg Qi with red, swollen, painful knees, legs or feet
   Damp-Heat jaundice
2. Drains Kidney Fire (False Heat, Deficiency Heat)
   Kidney Yin Deficiency with Empty Fire Rising (steaming bone disorder, night sweats, afternoon fevers and sweating, occasionally with nocturnal emissions and spermatorrhea)
3. Drains Fire and relieves Fire toxicity
   Toxic sores and Damp-skin lesions (internally and topically)

Standard Dosage: 6-10g in decoction.
Cautions: It is contraindicated for deficiency-cold syndrome. Overdosage and long-time taking will impair spleen and stomach.

Pinyin: Qing Dai  Chinese: 青黛
Pharmaceutical: Indigo Naturalis
Taxonomy: Isatis indigotica seu Baphicacanthus cusia seu Polygonum tinctorium
English: Natural Indigo

Tastes: Bitter, salty, cold
Meridians Entered: Liver, Heart, Lung and Stomach

Actions & Indications:

1. Clears Heat, resolves Fire toxicity, cools the Blood and reduces maculae
   Maculae due to Blood Heat (Xue Stage Heat)
   Can be used alone for bleeding due to Blood Heat, especially epistaxis where it is placed on cotton wool as a nasal plug.
2. Clears Heat, resolves Fire toxicity, cools the Blood, disperses Stagnation and reduces swelling
   Throat inflammation, dysphagia, sores of the mouth or mumps due to blazing Heat (internal or topical)
3. Drains Liver Fire, dispels Summerheat and extinguishes Wind to stop tremors
   Convulsions, red eyes, sore throat and other manifestations of Heat, especially Summerheat, affecting the Liver
4. Clears Liver Fire, drains Lung Heat and cools the Blood
   Cough due to Lung Heat Cough and chest pain due to Liver Fire attacking the Lungs
5. Expels Gu Parasites
   Chronic inflammatory disease (Fruehauf, 2015)

Standard Dosage: 1.5-3g as pills or powder internally. Should not be decocted because it is insoluble in water.