治外感痰喘，服小青龙汤，病未全愈，或愈而复发者，继服此汤。
龙骨（一两，不用 捣） 牡蛎（一两，不用 捣） 生杭芍（五钱） 清半夏（四钱） 苏子（四钱，炒捣）
牛蒡子（三钱，炒捣）
热者，酌加生石膏数钱或至一两。
从来愚治外感痰喘，遵《伤寒论》小青龙汤加减法，去麻黄加杏仁，热者更加生石膏，莫不随手而愈。
然间有愈而复发，再服原方不效者，自拟得此汤后，凡遇此等证，服小青龙汤一两剂即愈者，继服从龙汤一剂，
必不再发。未全愈者，服从龙汤一剂或两剂，必然全愈。名曰从龙汤者，为其最宜用于小青龙汤后
也。
或疑，方中重用龙骨、牡蛎，收涩太过，以治外感之证，虽当发表之余，仍恐余邪未尽，被此收涩之药固
闭于中，纵一时强制不喘，恐病根益深，异日更有意外之变。答曰∶若是以品龙骨、牡蛎，浅之乎视龙骨、牡
蛎者也，斯可征之以前哲之说。
徐灵胎曰∶龙骨最粘涩，能收敛正气，凡心神耗散，肠胃滑脱之疾，皆能已之。此药但敛正气，而不敛邪
气。所以仲景于伤寒邪气未尽者，亦恒与牡蛎同用，若仲景之柴胡加龙骨牡蛎汤，桂枝、甘草、龙骨、牡蛎汤
诸方是也。愚于伤寒、温病，热实脉虚，心中怔忡，精神骚扰者，恒龙骨与萸肉、生石膏并用，即可随手奏效。
门人高××曾治一外感痰喘，其喘剧脉虚，医皆诿为不治。高××投以小青龙汤，去麻黄，加杏仁，又加生
石膏一两、野台参五钱，一剂而喘定。恐其反复，又继投以从龙汤，亦加人参与生石膏，其病霍然顿愈。
又∶子××治曲姓叟，年六十余，外感痰喘，十余日不能卧。医者投以小清龙汤两剂，病益加剧（脉有热而不
敢多加生石膏者其病必加剧）。××视之，其
脉搏一息六至，上焦烦躁，舌上白苔满布，每日大便两三次，然非滑泻。审证论脉，似难挽回。而××仍投以小
青龙汤，去麻黄，加杏仁，又加野台参三钱，生龙骨、生牡蛎各五钱，生石膏一两半。一剂病愈强半，又服一
剂全愈。
按∶前案但加补气之药于小青龙汤中，后案并加敛气之药于小青龙汤中，似近于少年卤莽，而皆能挽回至
险之证，亦可为用小青龙汤者多一变通之法矣。
邑，郑××，年五十许。感冒风寒，痰喘甚剧，服表散、清火、理痰之药皆不效，留连二十余日，渐近垂危。
其甥刘××，从愚读书，与言医学，颇能记忆。闻其舅病革，往省之，既至，
则衣冠竟属纩矣。刘××用葶苈（四钱生者布包）大枣（五枚擘开）汤，加五味子二钱，煎汤灌之，豁然顿醒，
继服从龙汤一剂全愈。盖此证乃顽痰郁塞肺之窍络，非葶苈大枣汤，不能泻之。且喘久则元气必虚，加五味子
二钱，以收敛元气，并可借葶苈下行之力，以纳气归肾也。可知拙拟从龙汤，固宜于小青龙汤后，而服过发表
之药者，临时制宜，皆可酌而用之，不必尽在小青龙汤后也。
For phlegm-asthma caused by external contraction, if the condition is not fully cured after taking Xiao Qing Long Tang (Minor Blue Dragon Decoction), or if it recurs after recovery, continue with this decoction.
Long Gu (Fossilized Bones, 1 liang, not crushed) Mu Li (Oyster Shell, 1 liang, not crushed) Sheng Hang Shao (Raw Paeoniae Radix Alba, 5 qian) Qing Ban Xia (Clear Pinelliae Tuber, 4 qian) Su Zi (Perilla Seed, 4 qian, stir-fried and crushed)
Niu Bang Zi (Arctii Fructus, 3 qian, stir-fried and crushed)
If heat signs are present, add Sheng Shi Gao (Raw Gypsum Fibrosum) in a酌量 dose ranging from several qian to 1 liang.
In my past treatments of phlegm-asthma due to external contraction, I followed the modification principles of Xiao Qing Long Tang (Minor Blue Dragon Decoction) from *Shang Han Lun* (Treatise on Cold Pathogenic Diseases), removing Ma Huang (Ephedrae Herba) and adding Xing Ren (Armeniacae Semen Amarum). For cases with heat, I further added Sheng Shi Gao (Raw Gypsum Fibrosum), achieving immediate results without exception.
However, occasionally there are cases where the patient recovers but relapses, and re-administering the original formula proves ineffective. Since devising this decoction, for such conditions, when Xiao Qing Long Tang (Minor Blue Dragon Decoction) cures the illness in one dose, following up with one dose of Cong Long Tang (Dragon-Following Decoction) ensures no recurrence. For those not fully cured, one or two doses of Cong Long Tang (Dragon-Following Decoction) will inevitably lead to complete recovery. It is named Cong Long Tang (Dragon-Following Decoction) because it is most suitable for use after Xiao Qing Long Tang (Minor Blue Dragon Decoction).
Some may doubt that the heavy use of Long Gu (Fossilized Bones) and Mu Li (Oyster Shell) in the formula is overly astringent. Treating external contraction syndromes, even in the aftermath of releasing the exterior, there is still concern that residual pathogens might be sealed inside by these astringent herbs. Although wheezing may be temporarily suppressed, the root cause of the disease could deepen, leading to unexpected complications later. The answer is: To view Long Gu (Fossilized Bones) and Mu Li (Oyster Shell) in this manner is to underestimate them superficially. This can be verified by citing the words of former sages.
Xu Lingtai said: "Long Gu (Fossilized Bones) is very sticky and astringent; it can consolidate righteous Qi. It can cure diseases involving dissipation of heart-mind spirit and sliding/descending of the intestines and stomach. This herb only consolidates righteous Qi and does not consolidate pathogenic Qi. Therefore, Zhang Zhongjing often used it together with Mu Li (Oyster Shell) when treating Shang Han (Cold Damage) where pathogenic Qi had not yet exhausted, as seen in formulas like Chai Hu Jia Long Gu Mu Li Tang (Bupleurum Plus Fossilized Bones and Oyster Shell Decoction) and Gui Zhi Gan Cao Long Gu Mu Li Tang (Cinnamon Twig and Licorice Plus Fossilized Bones and Oyster Shell Decoction)." In my treatment of Shang Han (Cold Damage) and Wen Bing (Warm Diseases), presenting with heat excess, deficient pulse, palpitations (Zheng Tong), and mental agitation, I frequently combine Long Gu (Fossilized Bones) with Yu Rou (Corni Fructus) and Sheng Shi Gao (Raw Gypsum Fibrosum), achieving immediate efficacy.
My disciple Gao XX once treated a case of phlegm-asthma due to external contraction. The wheezing was severe, and the pulse was deficient. Physicians all declined to treat it as incurable. Gao XX administered Xiao Qing Long Tang (Minor Blue Dragon Decoction), removing Ma Huang (Ephedrae Herba), adding Xing Ren (Armeniacae Semen Amarum), and further adding 1 liang of Sheng Shi Gao (Raw Gypsum Fibrosum) and 5 qian of Ye Tai Shen (Wild Taizhen Ginseng Radix et Rhizoma). After one dose, the wheezing subsided. Fearing recurrence, he then administered Cong Long Tang (Dragon-Following Decoction), also adding Ren Shen (Ginseng Radix et Rhizoma) and Sheng Shi Gao (Raw Gypsum Fibrosum). The patient recovered abruptly and completely.
Another case: Zi XX treated an elderly man surnamed Qu, over sixty years old, suffering from phlegm-asthma due to external contraction, unable to lie down for more than ten days. Physicians administered two doses of Xiao Qing Long Tang (Minor Blue Dragon Decoction), causing the condition to worsen (for those whose pulses show heat but dare not add much Sheng Shi Gao (Raw Gypsum Fibrosum), their condition will inevitably worsen). XX examined the patient: the pulse beat six times per breath, there was irritability in the upper jiao, the tongue was covered with white coating, and bowel movements occurred two to three times daily, though not loose stools. Assessing the syndrome and pulse, it seemed difficult to salvage. Yet XX still administered Xiao Qing Long Tang (Minor Blue Dragon Decoction), removing Ma Huang (Ephedrae Herba), adding Xing Ren (Armeniacae Semen Amarum), along with 3 qian of Ye Tai Shen (Wild Taizhen Ginseng Radix et Rhizoma), 5 qian each of Sheng Long Gu (Raw Fossilized Bones) and Sheng Mu Li (Raw Oyster Shell), and 1.5 liang of Sheng Shi Gao (Raw Gypsum Fibrosum). After one dose, the condition improved significantly; after another dose, full recovery was achieved.
Note: The previous case only added Qi-tonifying herbs to Xiao Qing Long Tang (Minor Blue Dragon Decoction), while the latter case added Qi-consolidating herbs to Xiao Qing Long Tang (Minor Blue Dragon Decoction). This may seem rash for a young practitioner, yet both managed to salvage critical conditions. This offers a flexible method for using Xiao Qing Long Tang (Minor Blue Dragon Decoction).
Mr. Zheng XX, about fifty years old, from our county. Contracted wind-cold, suffering from severe phlegm-asthma. Treatments involving exterior-releasing, heat-clearing, and phlegm-resolving herbs were ineffective. The condition lingered for over twenty days, gradually approaching a critical state.
His nephew Liu XX studied under me and discussed medical knowledge, retaining much of it. Hearing of his uncle's critical illness, he went to visit. Upon arrival,
clothes and hats were already prepared for the funeral rites. Liu XX used Ting Li Da Zao Tang (Descurainiae Semen et Jujubae Decoction), composed of Ting Li (Descurainiae Semen, 4 qian, raw, wrapped in cloth) and Da Zao (Jujubae Fructus, 5 pieces, torn open), adding Wu Wei Zi (Schisandrae Fructus, 2 qian). He decocted it and administered it orally. The patient suddenly awakened. Following this, one dose of Cong Long Tang (Dragon-Following Decoction) led to complete recovery. This syndrome involved stubborn phlegm obstructing the orifices and collaterals of the lungs; only Ting Li Da Zao Tang (Descurainiae Semen et Jujubae Decoction) could drain it. Moreover, prolonged wheezing inevitably depletes Yuan Qi (Primary Qi); adding 2 qian of Wu Wei Zi (Schisandrae Fructus) helps consolidate Yuan Qi (Primary Qi), and it can also utilize the descending power of Ting Li (Descurainiae Semen) to guide Qi back to the Kidneys. Thus, it can be seen that my devised Cong Long Tang (Dragon-Following Decoction), although suitable for use after Xiao Qing Long Tang (Minor Blue Dragon Decoction), can also be used酌情 (discretionarily) for those who have taken exterior-releasing herbs, adapting to temporary circumstances. It need not always follow Xiao Qing Long Tang (Minor Blue Dragon Decoction).