1. Where the Formula Comes From
Xiao Xu Ming Tang (小续命汤), or Minor Life-Prolonging Decoction, is a famous classical formula first recorded in Sun Simiao's Bei Ji Qian Jin Yao Fang and Qian Jin Yi Fang of the Tang dynasty, and later promoted in the Song-dynasty Tai Ping Hui Min He Ji Ju Fang. It belongs to the category of formulas that release wind-cold, warm the channels, and support the upright against an exterior cold attack when the qi is already deficient.
The formula targets the pattern of "deficient upright qi with external wind-cold blocking the channels." Typical signs include sudden hemiplegia, numb limbs, a deviated mouth and eye, and slurred speech in a stroke — together with aversion to cold, no sweat, and joint pain — as well as cold painful joints that worsen with cold, and wind-cold headaches. It is widely used for acute stroke of this pattern, for wind-cold bi (arthralgia), and for severe exterior cold in the elderly and frail.
The name "xu ming" (continue life) carries deep meaning: it expresses the hope of sustaining a person whose qi is depleted and invaded by evil — the very concern for a critical condition like stroke — and it reflects the formula's important place in acute, severe illness.
2. Acute Stroke
In modern practice it's used for the acute stroke that fits "deficient qi with external wind-cold": sudden hemiplegia, numb limbs, a deviated mouth and eye, with chills, no sweat, cold painful joints, a thin white tongue coating, and a floating-tight pulse. Cerebral hemorrhage must be ruled out first. For ischemic stroke, once the condition is stable (roughly days 7–14 after onset), Xiao Xu Ming Tang can help improve limb function, ease the chills and pain, and reduce the risk of aftereffects.
3. Wind-Cold Bi (Arthralgia)
For osteoarthritis, rheumatic, and rheumatoid arthritis with cold aching joints — worse in the cold, better with warmth, limited movement — plus weakness and chills, it also works. Adjust by site: for lower-back and knee pain, add Niu Xi and Du Zhong to tonify the liver and kidney and strengthen the channel-opening, pain-easing effect.
4. Severe Exterior Cold in the Frail
For the elderly and constitutionally weak with severe wind-cold — chills, fever, no sweat, aching limbs, even a splitting headache, plus fatigue and shortness of breath — it quickly scatters the cold and settles the body. Plain cold remedies may fail in such weak patients; the formula's support-and-expel pairing helps them recover quickly and avoid complications.

5. Other Uses
It's also used for wind-cold-triggered facial nerve palsy (facial paralysis) — a deviated mouth and eye, a cold-feeling face worse in the cold, with fatigue — and, after ruling out allergies, for severe wind-cold colds in children (paired with Sheng Jiang and Cong Bai) to clear the cold and head off pneumonia.