苍术（五钱） 橘皮 浓朴（各三线） 甘草（二钱）
湿淫于内，满闷呕泻及山岚障气，不服水土。主此方者，苍术本性烈，加以橘皮则燥湿而利气；浓朴微苦温，
和以甘草则宽中而散满。四药泻中有补，凉中有温，直令胃土和平，永无湿郁之患，故曰平胃。又经曰∶谷气通
于脾。山岚障气，谷气也。人受之不服水土，而腹胀不食。盖土湿太过，故用疮术以燥之，甘草以和之，橘皮、
浓朴宽中利气以行之。本方加麦芽、神曲，名加味平胃散，治宿食不消，吞酸嗳气。本方加藿香、半夏，名不换
金正气散，治腹痛呕吐，及瘴疫湿疟。加草果、姜、枣，名对金饮子，治疟
疾。饮内再加人参、茯苓、乌梅，名人参养胃汤，治外感风寒，内伤生冷及夹食停痰发为 疟。本方合小柴胡汤，
名柴平汤，治湿疟。湿疟者，疟发时一身尽痛，手足沉重，寒多热少，脉濡是也。
芎 紫苏 橘皮 白芷 姜炒浓朴 蜜炙甘草 砂仁 麦芽 藿香 山楂 苍术 香附
目已病，忽头痛腹痛，吐泻交作，此感寒停食。主是方者，盖芎、苏、橘、芷散虚风而逐阴寒，砂、藿、楂、
芽正乖戾而消滞腻。再有调中之姜、朴、蜜、草，和气之香附、苍术，大剂煎投，自当立效。是故痘疹发热，腹
急痛，或呕或泄，症既相符，因应无异，进此散乃佳。
诗曰∶平胃橘皮苍草朴，升消增芷芎苏藿，山楂麦附缩砂仁，觉校本方殊老作。
湿气内盛，导致脘腹胀满、恶心呕吐、腹泻以及山岚瘴气、水土不服。此方以苍术为主药，因为苍术本性辛烈，加入橘皮后能燥湿并理气；浓朴味微苦性温，配合甘草则能宽中消胀。这四味药泻中有补，凉中有温，直接使脾胃之气平和，永远没有湿气郁结的隐患，所以称为“平胃”。又经云：“谷气通于脾。”山岚瘴气属于谷气一类。人感受了这种邪气而水土不服，出现腹胀、食欲不振。这是因为土湿太过，所以用苍术来燥湿，甘草来调和，橘皮和浓朴宽中利气以行滞。本方加入麦芽、神曲，名为加味平胃散，治疗宿食不消化，吞酸嗳气。本方加入藿香、半夏，名为不换金正气散，治疗腹痛呕吐，以及瘴疫湿疟。加入草果、生姜、大枣，名为对金饮子，治疗疟疾。在饮子中再加入人参、茯苓、乌梅，名为人参养胃汤，治疗外感风寒，内伤生冷以及夹食停痰引发的疟疾。本方与小柴胡汤合用，名为柴平汤，治疗湿疟。所谓湿疟，是指发作时全身疼痛，手足沉重，寒多热少，脉象濡软。
川芎 紫苏 橘皮 白芷 姜炒浓朴 蜜炙甘草 砂仁 麦芽 藿香 山楂 苍术 香附
眼睛已经患病，忽然出现头痛腹痛，上吐下泻同时发作，这是感受寒邪且停滞饮食所致。此方以川芎、紫苏、橘皮、白芷疏散虚风并驱逐阴寒，砂仁、藿香、山楂、麦芽纠正乖戾之气并消除积滞油腻。再加上调理中焦的生姜、浓朴，以及蜜炙甘草，还有理气的香附、苍术，用大剂量煎服，自然应当立即见效。因此，如果是痘疹发热，腹部急痛，或者呕吐或者腹泻，症状既然相符，应对方法没有差异，服用此散剂为佳。
Atractylodis Rhizoma (Wu Qian / 5 qian), Citri Reticulatae Pericarpium, Magnoliae Officinalis Cortex (each San Qian / 3 qian), Glycyrrhizae Radix et Rhizoma (Er Qian / 2 qian).
When dampness overflows internally, it causes fullness and oppression, nausea, vomiting, diarrhea, as well as mountain miasma (shān lán zhàng qì) and intolerance to local conditions. The main herb of this formula is Atractylodis Rhizoma (Cangzhu), which has a naturally pungent and fierce nature; when combined with Citri Reticulatae Pericarpium (Chenpi), it dries dampness and promotes the flow of Qi. Magnoliae Officinalis Cortex (Houpo) is slightly bitter and warm; when harmonized with Glycyrrhizae Radix et Rhizoma (Gancao), it expands the middle jiao and disperses fullness. These four herbs contain both purgative and tonifying properties, and cool and warm elements, directly bringing the Spleen and Stomach earth into harmony, permanently eliminating the risk of dampness stagnation; hence it is called Pingwei (Leveling the Stomach). Furthermore, the Classics state: "Grain Qi connects to the Spleen." Mountain miasma belongs to Grain Qi. When humans are affected by it and suffer from intolerance to local conditions, leading to abdominal distension and loss of appetite, it is because Earth dampness is excessive. Therefore, Atractylodis Rhizoma is used to dry dampness, Glycyrrhizae Radix et Rhizoma to harmonize, and Citri Reticulatae Pericarpium and Magnoliae Officinalis Cortex to expand the middle and promote Qi flow to move stagnation. Adding Maiya (Malt) and Shenqu (Medicated Leaven) to this base formula creates Jiawei Pingwei San (Modified Pingwei Powder), treating undigested food retention, acid regurgitation, and belching. Adding Huoxiang (Patchouli) and Banxia (Pinellia) creates Buhuanjin Zhengqi San (Buhuanjin Upright Qi Powder), treating abdominal pain, vomiting, and miasma-induced damp malaria. Adding Caoguo (Tsaoko), Shengjiang (Fresh Ginger), and Dazao (Jujube) creates Duijin Yinzi (Golden Pair Decoction), treating malaria. Adding Ren Shen (Ginseng), Fuling (Poria), and Wumei (Mume Fruit) to the decoction creates Renshen Yangwei Tang (Ginseng Nourishing Stomach Decoction), treating external contraction of wind-cold, internal injury from raw/cold foods, and malaria arising from retained food and phlegm stagnation. Combining this base formula with Xiaochaihu Tang (Minor Bupleurum Decoction) creates Chai Ping Tang (Bupleurum-Pingwei Decoction), treating damp malaria. Damp malaria is characterized by whole-body pain upon onset, heaviness in the hands and feet, more chills than fever, and a soggy pulse (Ru Mai).
Xiong (Ligustici Chuanxiong Rhizoma), Zisu (Perillae Folium), Chenpi (Citri Reticulatae Pericarpium), Baizhi (Angelicae Dahuricae Radix), Jiang Chao Houpo (Ginger-fried Magnoliae Officinalis Cortex), Mi Zhi Gancao (Honey-processed Glycyrrhizae Radix et Rhizoma), Sharen (Amomi Fructus), Maiya (Hordei Fructus Germinatus), Huoxiang (Agastaches Herba), Shanzha (Crataegi Fructus), Cangzhu (Atractylodis Rhizoma), Xiangfu (Cyperi Rhizoma).
If the eyes are already diseased, and suddenly headache and abdominal pain occur, accompanied by simultaneous vomiting and diarrhea, this indicates cold invasion and food stagnation. This formula uses Ligustici Chuanxiong Rhizoma, Perillae Folium, Citri Reticulatae Pericarpium, and Angelicae Dahuricae Radix to disperse deficient wind and drive out yin cold; Amomi Fructus, Agastaches Herba, Crataegi Fructus, and Hordei Fructus Germinatus correct rebellious qi and eliminate stagnation and greasiness. Additionally, Fresh Ginger and Magnoliae Officinalis Cortex regulate the middle jiao, honey-processed Glycyrrhizae Radix et Rhizoma harmonizes, and Cyperi Rhizoma and Atractylodis Rhizoma regulate Qi. Administered in a large dose via decoction, efficacy should be immediate. Therefore, in cases of variola (smallpox) or rubeola (measles) with fever, acute abdominal pain, or vomiting/diarrhea, if the symptoms match, the response method remains unchanged; administering this powder is excellent.
The poem states: Pingwei contains Chenpi, Cangzhu, Gancao, and Houpo; Shengxiao adds Baizhi, Xiong, Zisu, and Huoxiang; Shanzha, Maiya, Xiangfu, and Sharen complete it; Juejiao's edition of this formula differs significantly from older versions.