Caught a Cold: Coughing with White Phlegm and Clear Runny Nose? Doctor Luo Dalun on the OTC Pill Tong Xuan Li Fei Wan
Opening: the weather has turned cold, and more people are catching chills
Today Doctor Luo Dalun continues his series on ready-made Chinese medicines — the OTC products you find in pharmacies. This time we are still in the external-contraction chapter, and the star is Tong Xuan Li Fei Wan (Free the Lung and Disperse the Exterior Pills). Why talk about this medicine?
💬 Note from Doctor Luo: The weather has turned cold now, hasn’t it? The whole country is cooling down. So during this cooling, what happens to people with insufficient upright qi, people with insufficient yang qi? They catch cold again, and after catching cold they easily fall into external contraction.
The moment external cold arrives, the first thing to do: warm the body up fast
When external contraction is caused by a chill, what do you do in stage one? Doctor Luo has said it again and again: when the external cold is on the surface of the body, just arrived, you must warm the body up quickly and use every method to release the external cold.
💬 Note from Doctor Luo: For example, soak your feet in hot water, blow warm air on your back with a hairdryer, use moxibustion on Dazhui (GV14) — there are many, many methods. So once you learn these, many friends release the external pathogen in the very first moment, which is wonderful. So I always advocate: in that first moment, if we can clear the external pathogen with simple methods, basically nothing happens afterwards.
Yam water: a wonderful spleen-strengthening, cold-expelling trick
Besides the warming methods, Doctor Luo has also taught one very important move — strengthening the spleen. When spleen qi is sufficient, upright qi is sufficient, and the external pathogen is easy to remove.
💬 Note from Doctor Luo: What method is that? Drinking yam water, right? We mix yam powder (huai shan yao) into a paste, pour hot water over it, drink it down, and soon the body starts to sweat — and once you sweat, the external pathogen is released. I think this method works for most people, the vast majority. This is the method of supporting upright qi to repel cold, and it is better than simply drinking hot water.
The ‘enhanced version’ of external cold: the cough arrives
When external cold has just arrived, what problem easily appears? Coughing — the moment cold qi injures you, you easily cough. If you don’t control it in the first moment, you move into stage two, called external cold with internal heat. So at the boundary — stage one just about to leave, stage two not yet entered — what medicine do you use?
💬 Note from Doctor Luo: If at this point your main symptom is coughing, and the cough even has phlegm, and the phlegm is white or greenish — then what should we call this? The enhanced version of external cold, the stage where external cold is just about to penetrate deeper. So when coughing is the main problem, what do you do? This formula, Tong Xuan Li Fei Wan, is made exactly for this.
When the external cold is very, very light, drinking some perilla leaf water, some hot water, or blowing warm air on your back is enough; if the illness is a bit heavier and you want the “enhanced version,” add medicine — which OTC pill can help? Tong Xuan Li Fei Wan.
A yang-warming, cold-dispersing medicine rarely seen on the market
Doctor Luo points out just how precious this medicine is:
💬 Note from Doctor Luo: Honestly, on the market, yang-warming, cold-dispersing medicines for external contraction are very few. To be frank, most are heat-clearing or for the external-cold-with-internal-heat stage. Medicines of this yang-warming, cold-dispersing type are extremely few in variety. Tong Xuan Li Fei Wan is one of the very rare treasures among them, and everyone really should know about it.
What does being chilled feel like? Clear runny nose, chills, back-of-the-neck pain, dry cough
So once you are chilled, what does the body show? Doctor Luo describes it very concretely:
💬 Note from Doctor Luo: Once you are blown by cold wind, chilled, you start sneezing. What are the symptoms of a chill? Sneezing, right? A clear runny nose — the nose runs clear, not yellow; it’s clear mucus, like water, right? You feel cold all over, you may even have a headache, and the back of the neck, the neck area, hurts.
The cough has its own distinction too — a cough from a fresh chill is different from a cough after the illness has dragged on:
💬 Note from Doctor Luo: This dry, shallow cough can even push the temperature up a little, and you keep coughing. This kind of cough is not especially violent — you can listen: if the illness has gone on a long time, the external pathogen has penetrated deeper, and the phlegm sound is very heavy deep in the chest; this shallow cough, by contrast, sits at the throat, constantly dry-coughing like this.
Formula breakdown one: ma huang paired with perilla leaf lead the charge to disperse cold and release the exterior
The whole formula of Tong Xuan Li Fei Wan is warming-centered. What leads the charge?
💬 Note from Doctor Luo: You can see that leading the charge are ma huang (ephedra) and zi su ye (perilla leaf). Ma huang, as everyone knows, is a strong sweating herb — in the past, the Shang Han Lun (Treatise on Cold Damage) formula was called Ma Huang Tang (Ephedra Decoction), right? It makes you sweat, opens lung qi, and can scatter cold pathogens; it especially opens lung qi, and works quite well for coughs caused by cold. So ma huang leads the charge.
But ma huang is a strong herb, and you should use it with awareness:
💬 Note from Doctor Luo: Ma huang belongs to the strong sweating category. Why? Because it excites and invigorates yang qi, so some people find their heart beats faster after taking it — it is quite strong. What about zi su ye? Zi su ye sweats a little less strongly than ma huang; of course it also unblocks the channels and disperses external cold, and it does promote sweating. Zi su ye also harmonizes the middle — for example, if you’ve eaten fish or shrimp that didn’t agree with you, people traditionally put a little perilla leaf in when cooking fish and shrimp, to neutralize their toxicity. Perilla is actually food therapy — in the northeast of China, for example, the Korean community makes pickles from it, and perilla is very tasty. There are white perilla leaves and purple perilla leaves; zi su ye is the one where the whole leaf is purple, and it grows all over the earth, so you see perilla everywhere in the north. Perilla leaves are edible as a vegetable anyway, quite mild, so I often tell people: after catching external cold, boil some perilla leaf water — buy the dried perilla leaves at the pharmacy, grab a small handful, boil them into a drink — that too can disperse cold and release the exterior, and it works well.
Ma huang paired with perilla leaf — the two herbs working together to disperse cold and release the exterior — is a very classic combination. Of course, with the other herbs in the formula combined, the effect is even better.
Formula breakdown two: chen pi, ban xia, fu ling, gan cao — Er Chen Tang to transform phlegm-dampness
What comes next? The formula adds herbs that regulate lung qi and transform phlegm.
💬 Note from Doctor Luo: For example, it adds chen pi (tangerine peel). Chen pi is warm in nature; it regulates qi, transforms phlegm, and opens lung qi. So I sometimes say: for a simple wind-cold cough, just take some chen pi as a drink and it already helps. In the past they also used ju hong (red tangerine peel) — ju hong is different from chen pi; ju hong releases the exterior more strongly. Chen pi carries white flesh inside and also harmonizes the middle.
Chen pi on the one hand helps the ma huang and perilla leaf in front of it to open lung qi and disperse the external cold outward; on the other hand, it transforms the phlegm-dampness inside the body — why do you catch a cold when chilled? Because phlegm-dampness is heavy in the body and spleen qi cannot transport and transform properly. What does chen pi pair with next?
💬 Note from Doctor Luo: Chen pi pairs with ban xia (pinellia). Ban xia also dries dampness and transforms phlegm, and it has the function of descending qi. After external cold, when the cough is quite severe and qi is rising and rebelling strongly, what does ban xia do? It descends the qi a little, collects and restrains the qi movement. Chen pi pairs with ban xia, then adds fu ling (poria) — what does fu ling do? It drains dampness, drains dampness to strengthen the spleen. Now chen pi, ban xia, fu ling, plus the gan cao (licorice) that comes later — what formula is that? Er Chen Tang (Two Aged Ingredients Decoction), right? Er Chen Tang dries dampness and transforms phlegm — it removes the dampness and transforms the phlegm.
What does Er Chen Tang tell us? It tells us this kind of person carries very heavy phlegm-dampness in the body — after being struck by external pathogens, the phlegm-dampness worsens and accumulates, so they cough endlessly, even with phlegm, lots of phlegm — green phlegm or white phlegm. Transform the phlegm-dampness away, and you can strengthen the spleen, letting spleen qi run normally. So this formula looks outward on one side — helping you disperse the external cold — and on the other side adds Er Chen Tang to transform phlegm and dissolve that phlegm-dampness.
Formula breakdown three: ku xing ren, qian hu, huang qin — descending lung qi and preventing heat from forming
Transforming phlegm with Er Chen Tang isn’t enough, so ku xing ren (bitter apricot kernel) is added.
💬 Note from Doctor Luo: Ku xing ren descends lung qi and also transforms phlegm. In this situation the phlegm is quite fierce — with severe coughing and phlegm on one side, we regulate the lung qi, unblock the lung qi, then transform it away. In this way, once the exterior cold is dispersed on the outside and the phlegm-dampness transformed, the external pathogen is easy to release.
The formula also contains qian hu (peucedanum root) — it descends lung qi and clears lung heat. You may ask: you said disperse external cold — why does it also descend lung qi, clear lung heat, and include cooling herbs?
💬 Note from Doctor Luo: Here is the thing: this formula is for the moment when external cold is about to move into the body, when it has just entered a slight external-cold-with-internal-heat state. So while you clear the external cold with warm herbs, you also add a little heat-clearing herb. It is not purely yang-warming herbs — at the very start of a chill, all-warming herbs are fine; but now you’ve been chilled for a few days, the cold pathogen hasn’t been released, and the external pathogen is about to move inward, right? And inside, because your phlegm-dampness is already heavy, what do we do? We give you warm herbs to disperse the external cold, and on the other side we add a little cooling herb — just a little — to prevent heat from forming inside. So it pairs qian hu to descend lung qi, and adds huang qin (baical skullcap root) — huang qin clears lung heat. Do you see? Actually this formula already has a touch of treating external-cold-with-internal-heat about it, though of course its main job is still dispersing external cold.
Formula breakdown four: jie geng paired with zhi ke — one rising, one falling, opening up the lung qi
The formula also includes jie geng (platycodon root) and zhi ke (bitter orange), and this pair is very deliberate.
💬 Note from Doctor Luo: Jie geng opens lung qi, treats sore throat, and also detoxifies. It opens the lung qi and lifts the qi upward — it raises the qi; while zhi ke, after being stir-fried (chao zhi ke), sends qi downward. So one rising, one falling — what does that do? It opens up the congested lung qi — I give you both rising and falling, right? So this is a formula with both rising and falling; with jie geng and zhi ke added, the effect is even better — it regulates qi.
When to use it? When not to? — Don’t use a cannon to kill a fly
Once you know the composition of the formula, you know when to use it. Doctor Luo stresses: the stage of the cold determines completely different medicines.
💬 Note from Doctor Luo: Say you get chilled today — you go out and the cold wind blows on you, and you come back. You don’t need medicine. Don’t take this formula just because you caught a chill — that’s not right. If you were chilled earlier today, what do you do when you get home? Use the warming methods: drink yam water, use perilla leaf water, soak your feet, and so on — just make yourself sweat. If you didn’t deal with it in time, and after a few days the coughing has become obvious — coughing white phlegm, nose running clear — the cough is obvious, day after day, and the cold pathogen hasn’t been released — actually after a few days, the external pathogen has begun to turn toward heat — this is when you know to use Tong Xuan Li Fei Wan.
So don’t pop Tong Xuan Li Fei Wan the moment external cold arrives — that’s using a cannon to kill a fly, a bit much.
💬 Note from Doctor Luo: If you missed the first moment, delayed a few days, and you feel something is off — the hairdryer on the back doesn’t seem to work anymore, right? The phlegm is more plentiful, and this cough really can’t be cleared — but at this point there is still no obvious fever, the phlegm is still white, the nose still runs clear, and it hasn’t turned to heat yet. Then, my friends, you use Tong Xuan Li Fei Wan. Do you understand what I mean?
And there is one iron rule you must remember: once the phlegm turns yellow, the nose runs yellow, fever begins, or the throat hurts, you cannot use this formula.
💬 Note from Doctor Luo: If the phlegm turns yellow, the nose runs yellow, fever starts, and the throat hurts — then you can’t use this formula, everyone must remember that. Because by then heat has already formed inside the body, and purely dispersing cold is no longer enough. This formula is still mainly about dispersing cold; it only has a tiny bit of heat-clearing, like that.
Also, why is transforming phlegm and regulating qi so important? Doctor Luo explains the principle: if the body is heavy with phlegm-dampness, then qi and blood movement is certainly obstructed — such people are lethargic, overweight, exhausted all day; they are not in a state of vigorous vitality. Transform that phlegm-dampness, free up the qi movement, and it becomes easier to disperse the external cold.
Can children take it? — Generally no, but when truly needed, yes
What parents can’t stand most is a child’s cough. A child gets blown by cold wind and starts coughing — can this medicine be used?
💬 Note from Doctor Luo: I think in general, children should not use it. Why? Usually they don’t need so many qi-regulating, phlegm-transforming herbs; children’s colds are generally not that heavy. So I advocate giving children yam water, foot soaks, perilla leaf water, and massage — handle it with methods like these. Only when the child’s cough is genuinely quite severe, with phlegm sounds, and the external pathogen simply won’t clear — then you can use a little Tong Xuan Li Fei Wan.
Some parents worry: this medicine contains ma huang — isn’t it unsuitable for children?
💬 Note from Doctor Luo: Actually, it’s fine. If you gave a child ma huang on its own, then yes, it’s hard for you to control the dose — that’s for a TCM practitioner to manage, right? But added into this formula, the ma huang amount is actually not large — a tiny little pill of Tong Xuan Li Fei Wan; a child takes a fraction of a pill, and within it ma huang is just one ingredient, so there’s no big problem; it can be used. But everyone remember: don’t give this to a child long-term, don’t keep feeding children unnecessary medicine — medicine is medicine after all; it makes them sweat, and why would you make a child sweat that much? So I advocate that children rely mainly on food therapy, and only in a last resort use ready-made Chinese medicines. Let the child’s own body train itself and resist external pathogens; medicine is only an aid — generally it is beneficial to let a child’s own immunity resist a little.
How do adults judge? Just look at the tongue
For adults, Doctor Luo gives a very clear tongue criterion.
💬 Note from Doctor Luo: When an adult catches external cold — if the cough is obvious, with clear phlegm sounds, then the tongue should be puffy, and the tongue coating should be very thick. Why? Because phlegm-dampness is very heavy in the body. If your tongue looks like this — puffy, lots of saliva on top, very thick coating — and you’re coughing, with white phlegm, a clear runny nose, and the body feeling a bit cold, then this is the external-cold stage, external cold just arrived, stage one of a cold — you can use Tong Xuan Li Fei Wan.
Summary: the typical ‘external cold stage one’ symptom picture
Finally, Doctor Luo strings together the complete picture of suitable symptoms:
💬 Note from Doctor Luo: This is a famous formula, a very classic one. Go to any pharmacy — Tong Ren Tang, for example — and they will certainly have this medicine, right? So once you master this: if you encounter it — external cold from a chill, stage one, whole body cold, nose feeling a bit blocked, clear runny nose, then headache. The headache comes with sensitivity to cold, especially pain at the back of the neck and the occiput, and no sweating — don’t use it if you’re sweating a lot from the cold; no sweating, barely any sweat, the body surface is closed up — aching limbs, the body feeling both sore and painful, that chilled feeling. At that point this formula works well, and you can use it.
Doctor Luo says he has been to pharmacies these past couple of days to look at ready-made Chinese medicines, and there really are many varieties. If everyone comes to understand these OTC medicines, many problems can be solved by yourself. Today’s talk has made clear when Tong Xuan Li Fei Wan should be used and what it does, so you know what this medicine is for. Next he will continue explaining more ready-made Chinese medicines and how to use them.
What to take away
- Tong Xuan Li Fei Wan (Free the Lung and Disperse the Exterior Pills) is a classic OTC medicine found in most pharmacies (Tong Ren Tang and others). Its job: disperse cold, release the exterior, free the lung and stop cough — for the wind-cold external contraction cough: when the cough is obvious with white phlegm and a clear runny nose, before heat has formed.
- Timing matters. On the day you get chilled, don’t take medicine — warm methods first (foot soak, hairdryer on the back, moxa at Dazhui GV14, yam water, perilla leaf water). Only after a few days of delayed clearing, when the cough becomes the main symptom with white or greenish phlegm and no fever yet, does Tong Xuan Li Fei Wan come in.
- The iron rule: when phlegm turns yellow, the nose runs yellow, fever starts, or the throat hurts — heat has formed; stop and switch approach.
- Children generally don’t need it — yam water, foot soaks, perilla leaf water and massage; use OTC medicine only as a last resort, in small fractions, and never long-term.
- This formula is one of the rare yang-warming, cold-dispersing OTC medicines for external contraction — most products on the market are heat-clearing or made for the external-cold-with-internal-heat stage, so keep this one in mind.
Compiled from Doctor Luo Dalun’s lecture on ready-made Chinese medicines. Tong Xuan Li Fei Wan is a classic OTC medicine commonly stocked by pharmacies (Tong Ren Tang and other major chains), indicated for wind-cold external contraction cough — the external-cold stage with obvious coughing, white phlegm and clear nasal discharge before heat has formed — dispersing cold, releasing the exterior, freeing the lung and stopping cough.