Liang Ge San (Diaphragm-Cooling Powder) liáng gé sǎn · 凉膈散

Safety. Liang Ge San is recorded in the Taiping Huimin Hejiju Fang, the Song official formulary. It is a clearing formula, but the way it clears is the thing worth understanding before anything else: it contains both rhubarb and sodium sulphate, which together produce a brisk purge. The name says cooling the diaphragm; the mechanism says emptying the bowel. A reader who arrives expecting something to drink for mouth ulcers and does not notice the purge has misread the formula. The modern parallel makes the risk concrete. Sodium sulphate and rhubarb are the same two classes of agent that appear in bowel preparations and saline laxatives, and those preparations have a well-documented record of causing acute kidney injury and serious electrolyte disturbance, particularly in older adults and in people with impaired kidney function, heart failure, or who are also taking diuretics, ACE inhibitors, or NSAIDs. Sodium sulphate is a sodium load. In heart failure, cirrhosis with ascites, renal impairment and hypertension, a large sodium load is not a neutral event. Rhubarb is an anthraquinone stimulant laxative; European regulators restrict stimulant laxatives to short courses precisely because longer use is associated with dependence, electrolyte loss and melanosis coli — a pigmentation of the bowel wall that has been reported repeatedly and is generally reversible on stopping. Rhubarb also contains tannins, which are constipating, so the same root can produce loose stool and then the opposite. The classical picture deserves unpacking in modern terms too. Mouth and tongue sores, sore throat, vexation and thirst: a mouth ulcer that has not healed after three weeks is assessed rather than treated, and the list includes nutritional deficiency, drug reaction, lichen planus, Behcet disease and malignancy. Sore throat is assessed for streptococcal infection and for the emergencies that hide behind it — quinsy, epiglottitis. Constipation has its own red flags: new onset in later life, blood, weight loss, anaemia, and any suggestion of obstruction. And vexation in a feverish person can be agitation from hypoxia, sepsis or delirium rather than a pattern to be classified. Two ingredients in the formula point at licorice as well: glycyrrhizin causes a mineralocorticoid-like syndrome with sodium retention, potassium loss and raised blood pressure, and low potassium in turn raises the toxicity of digoxin and compounds the effect of diuretics. This formula therefore has two independent routes to hypokalaemia in the same prescription. Gardenia fruit contains geniposide; liver enzyme elevation has been reported with gardenia-containing preparations, and the preclinical signal is stronger than the human one — both halves of that sentence matter. Scutellaria root has been reported in case series of herbal liver injury, which is one reason any jaundice, dark urine or right-sided pain after taking such a preparation is treated as a reason to stop and seek care. Mint relaxes the lower oesophageal sphincter and can worsen reflux, and camphor- or menthol-containing preparations applied near an infant nose have been reported to provoke breathing difficulty. Forsythia fruit is generally regarded as low in toxicity, but it is worth separating it by name from St John wort, whose Chinese name shares the same two characters and which is a potent enzyme inducer with a long list of documented interactions. This page is not a recommendation. No quantity, no preparation, no regimen, no claim. Pregnancy and breastfeeding, children, older adults, kidney or heart disease, and any diuretic, digoxin, antihypertensive, lithium, anticoagulant or immunosuppressant medicine taken on medical advice each remove what room there was. Persistent vomiting, blood in the stool, reduced urine output, confusion or jaundice are emergency features.