Dang Gui Nian Tong Tang (Angelica Pain-Grasping Decoction) dāng guī niān tòng tāng · 当归拈痛汤

Safety. Dang Gui Nian Tong Tang is attributed to Zhang Yuansu's Yixue Qiyuan; it is also carried in Li Gao's Lan Shi Mi Cang. The double attribution is part of the record rather than a problem to settle, so this entry cites the source-linked attribution and notes the other. Fifteen herbs: one of the larger classical formulas, and the size is the point. Where a small formula aims at one movement, this one works several directions at once — dispersing wind from the exterior, draining damp through urination, clearing heat, and supporting what the tradition calls the upright qi. Two structural details repay attention. It holds cang zhu and bai zhu together: the same genus, one pungent and drying, one sweet and fortifying, treated by the tradition as two different herbs for two different jobs. It also holds three draining herbs — ze xie, zhu ling and yin chen — alongside the wind-dispersing ones, and that combination is the signature of a formula written for a pattern in which damp and heat are tangled rather than sequential. Its classical indications — limb pain of a heavy, troubled quality, weight across the shoulders and back, swelling of the legs — sit directly on a modern differential that includes conditions measured in hours. A single hot, swollen, exquisitely painful joint is septic arthritis until proven otherwise, and that is a same-day emergency; gout and calcium pyrophosphate deposition can look nearly identical to it. Fever with joint pain raises infection, endocarditis and systemic rheumatic flare. Unilateral calf swelling and pain raises deep vein thrombosis. And because this is a draining formula, it should be held against a plain arithmetic question: anyone already taking a diuretic, an ACE inhibitor or an NSAID, or living with heart failure or kidney disease, has a fluid and electrolyte balance that a second draining agent perturbs. Safety specifics. Ku shen (Sophora flavescens) has published reports of liver injury and of gastrointestinal adverse effects, and its alkaloid matrine is pharmacologically active rather than inert. Sheng ma is an Actaea species, a genus with reports of hepatotoxicity, chiefly concerning the North American species. Ze xie has an unresolved literature on kidney effects at high exposure. Yin chen is the tradition's herb of choice for jaundice, which means anyone reaching for it is by definition inside the differential for viral hepatitis, biliary obstruction and haemolysis — and obstructive jaundice is a surgical matter, not a matter of pattern. Ren shen has mixed and conflicting evidence regarding warfarin, and mixed is the honest word. Bai zhu and cang zhu are not interchangeable. Zhi gan cao carries the pseudoaldosteronism syndrome. None of this makes the formula a treatment for gout, arthritis or any named disease, and this entry makes no such claim.