Relaxing tendons and collaterals

"Relaxing tendons and collaterals" (Shujin Huoluo) is a therapeutic concept and clinical indication rooted in Traditional Chinese Medicine (TCM) rather than a specific molecular target, receptor, or enzyme. It describes a pharmacological effect intended to alleviate musculoskeletal pain, reduce muscle stiffness, and improve microcirculation in the limbs and joints (WHO International Standard Terminologies on TCM). In modern drug discovery, this term is frequently used to describe the polypharmacological activity of herbal extracts or multi-component formulations that possess anti-inflammatory, analgesic, and antispasmodic properties. Because it represents a physiological outcome or a broad therapeutic principle involving multiple biological pathways—such as the inhibition of COX-2 or the regulation of calcium signaling in smooth muscle—it does not possess a unique UniProt ID or a discrete molecular structure. Consequently, it is categorized as a therapeutic category or indication rather than a valid biological target for drug development (PubMed: 30204306, NIH: NCCAM).

Other names

Shujin HuoluoRelaxing sinews and activating collateralsSoothing tendons and invigorating collateralsExpelling wind and dampness to relax tendons

In Traditional Chinese Medicine (TCM), the mechanism involves restoring the flow of Qi and blood to the 'meridians' and 'collaterals' to alleviate stagnation. From a modern pharmacological perspective, this is achieved through the inhibition of pro-inflammatory cytokines (e.g., TNF-alpha, IL-6), reduction of oxidative stress in connective tissues, and modulation of neuromuscular junctions to promote muscle relaxation (PMC7345331, PMC6270830).