凡服药多少，要与病患气血相宜，盖人之禀受本有强弱，又贵贱苦乐，所养不同，岂可
以一概论，况病有久新之异，尤在临时以意裁之，故古方云，诸富贵人骤病，或少壮肤腠致
密，与受病日浅者，病势虽轻，用药宜多，诸久病之人，气形羸弱，或腠理开疏者，用药宜
少。
术忌桃李胡荽大蒜青鱼酢等，巴豆忌芦笋，黄连桔梗忌猪肉，地黄忌芜荑，半夏菖蒲
忌饴糖羊肉，细辛忌生菜，甘草忌菘菜，牡丹皮忌胡荽，商陆忌犬肉，常山忌生葱生菜，空
青丹砂忌生血物，茯苓忌醋，鳖甲忌苋菜，天门冬忌鲤鱼。
古方逐名下，并载此禁忌，谓如理中丸，合忌桃李胡荽大蒜青鱼酢菘菜等物，即使服饵
者，多致疑惑，自非单行久服饵者，当根据此法，仓卒治病，不必拘忌，今除药有相反者，已
行删去外，所有逐病通行禁忌法，复具如左。
凡风病通忌五辛甘滑生冷油腻之类。
凡伤寒时气忌羊肉杂食。及病瘥后、尤忌肉食。
凡热病新瘥，及大病之后，食猪肉及肠血肥鱼油腻等，必大下痢，医不能疗也。
又食饼饵粢黍饴脯 炙，枣栗诸果，及坚实难消之物，必更结热，以药下之，则胃中
虚冷，大利不禁难救。
凡香港脚之病，极须慎房室，羊肉牛肉鱼蒜蕺菜菘菜蔓菁瓠子酒面酥油乳麋猪鸡鹅鸭，有
方用鲤鱼头，此等并切禁，不得犯之，并忌大怒，及生果子酸酢之食，又特忌食瓠子蕺菜之
类，犯之一世治不愈。
凡症瘕癖积忌生冷酥滑物。
凡吐逆下利等忌生冷酢滑腻物。
凡噎塞胀满及痼冷诸气并忌生冷。
凡积热忌鱼酒热面等。
凡咳嗽咯血吐血。忌诸热物。
凡痰饮忌酒醋。
凡消渴忌房室。
凡水气忌羊头蹄及盐一切咸物。
凡服药不可食生胡荽诸滑物。及果实肥猪犬肉油腻肥羹鱼 腥臊等物。又云。服药通
忌见死尸。及产妇淹秽事。
凡是服药的剂量，必须与患者的气血状况相适应。因为人的先天禀赋本来就有强弱之分，加上社会地位的高低、生活的苦乐以及养育方式的不同，怎么能用统一的标准来概括呢？况且疾病有久病和新病的区别，尤其需要根据具体情况灵活判断。所以古方中说：那些富贵之人突然患病，或者年轻力壮、皮肤腠理致密的人，以及患病时间较短的人，虽然病情看似轻微，但用药剂量宜大；而那些久病的人，气色和形体虚弱羸弱，或者腠理疏松的人，用药剂量宜小。
服用白术时，忌食桃李、胡荽（香菜）、大蒜、青鱼、醋等；服用巴豆时，忌食芦笋；服用黄连、桔梗时，忌食猪肉；服用地黄时，忌食芜荑；服用半夏、菖蒲时，忌食饴糖、羊肉；服用细辛时，忌食生菜；服用甘草时，忌食菘菜（白菜）；服用牡丹皮时，忌食胡荽；服用商陆时，忌食犬肉；服用常山时，忌食生葱、生菜；服用空青、丹砂时，忌食生血类食物；服用茯苓时，忌食醋；服用鳖甲时，忌食苋菜；服用天门冬时，忌食鲤鱼。
古方在每一方剂名称下，都记载了这些禁忌，例如说如理中丸，就忌讳桃李、胡荽、大蒜、青鱼、醋、菘菜等食物。这让服药者产生很多疑惑。如果不是长期单独服用某种药物的人，应当依据此法；但在仓促治病时，不必拘泥于禁忌。现在除了药物存在相反配伍禁忌的已经删除外，所有针对各种疾病的通行禁忌方法，重新列举如下。
凡是风病，普遍忌讳五辛（指葱、蒜、韭、薤、兴渠等五种有辛味的蔬菜）、甘甜、滑腻、生冷、油腻的食物。
凡是伤寒、时行疫病，忌讳羊肉及杂食。以及在病愈之后，尤其忌讳肉食。
凡是热病刚刚痊愈，以及大病之后，如果食用猪肉、肠血、肥鱼、油腻等食物，必然导致严重腹泻，医生也难以治疗。
另外，如果食用饼饵、粢黍、饴脯、烤肉、枣栗等各种水果，以及坚硬难消化的食物，必然会导致热邪郁结。如果用泻下药来治疗，则会导致胃中虚冷，出现无法控制的大利（严重腹泻），难以救治。
凡是香港脚（脚气病）患者，极须谨慎房事，并严禁食用羊肉、牛肉、鱼、蒜、蕺菜（鱼腥草）、菘菜、蔓菁、瓠子、酒、面、酥油、乳、麋、猪、鸡、鹅、鸭等食物。虽然有方剂使用鲤鱼头，但上述这些食物都严格禁止，不得触犯。同时忌讳大怒，以及生果子、酸醋类的食物。特别忌讳食用瓠子、蕺菜之类，一旦触犯，终身难以治愈。
凡是症瘕癖积（腹内结块、积聚之病），忌讳生冷、酥滑之物。
凡是呕吐、逆气、腹泻等病症，忌讳生冷、酸醋、滑腻之物。
凡是积热，忌讳鱼类、酒类、热性面食等。
凡是痰饮，忌讳酒、醋。
凡是消渴（糖尿病类似症状），忌讳房事。
凡是水气（水肿病），忌讳羊头、羊蹄以及盐、一切咸味食物。
凡是服药期间，不可食用生胡荽以及各种滑腻之物。以及果实、肥肉、猪狗肉、油腻浓汤、鱼腥臊等食物。又说，服药期间普遍忌讳接触死尸，以及产妇产后的污秽之事。
The dosage of medication must be compatible with the patient's Qi and Blood condition. This is because individuals' innate endowment varies in strength, and their social status, life experiences (hardship or joy), and upbringing differ significantly; thus, it is impossible to apply a uniform standard. Furthermore, diseases vary between chronic and acute conditions, requiring flexible judgment based on the specific situation. Therefore, ancient formulas state: For wealthy individuals who suddenly fall ill, or for those who are young and vigorous with dense skin and pores, as well as for those whose illness has been present for a short time, although the disease severity may appear mild, the medication dosage should be larger. Conversely, for patients with chronic illnesses who exhibit weak Qi and emaciated physique, or those with loose skin and pores, the medication dosage should be smaller.
When taking Baizhu (Atractylodis Macrocephalae Rhizoma), avoid peaches, plums, Coriandri Herba (Huixu, 胡荽/cilantro), Allii Sativi Bulbus (Dasuan, 大蒜/garlic), blue fish, and vinegar. When taking Badou (Crotonis Fructus, Bitter Apricot Seed/Croton Seed), avoid Asparagus Fern Root (Lusun, 芦笋). When taking Huanglian (Coptidis Rhizoma) and Jiegeng (Platycodonis Radix), avoid pork. When taking Dihuang (Rehmanniae Radix), avoid Myrabolans (Wuyi, 芜荑). When taking Banxia (Pinelliae Rhizoma) and Changpu (Acori Tatarinowii Rhizoma), avoid Malt Sugar (Yitang, 饴糖) and mutton. When taking Xixin (Asari Radix et Rhizoma), avoid raw vegetables. When taking Gancao (Glycyrrhizae Radix et Rhizoma), avoid Chinese Cabbage (Songcai, 菘菜). When taking Mudanpi (Moutan Cortex), avoid Coriandri Herba (Huixu, 胡荽/cilantro). When taking Shanglu (Phytolaccae Radix), avoid dog meat. When taking Changshan (Dichroae Radix), avoid raw green onions and raw vegetables. When taking Kongqing (Azurite) and Dansha (Cinnabaris, Cinnabar), avoid fresh blood products. When taking Fuling (Poria), avoid vinegar. When taking Biejia (Testudinis Carapax et Plastrum), avoid Amaranth leaves. When taking Tianmendong (Asparagi Radix), avoid carp.
Ancient formulas list these contraindications under each prescription name. For example, regarding Lizhong Wan (Regulate the Middle Pill), it states avoidance of peaches, plums, Coriandri Herba (Huixu, 胡荽/cilantro), garlic, blue fish, vinegar, and Songcai (Songcai, 菘菜/Chinese cabbage). This causes confusion among patients. Unless one is taking a single herb long-term, one should follow these methods; however, in urgent medical situations, strict adherence to these taboos is not required. Now, except for contraindications involving incompatible herbs which have been removed, all general contraindication methods for various diseases are listed below.
For Wind diseases, generally avoid Five Pungents (Wuxin, 五辛/five pungent vegetables like garlic, chives, etc.), sweet, slippery, cold, and greasy foods.
For Shanghan (Cold Damage) and seasonal epidemics, avoid mutton and mixed foods. After recovery, especially avoid meat.
For newly recovered Heat diseases, or after severe illness, consuming pork, intestinal blood, fatty fish, or greasy foods will inevitably cause severe diarrhea, which physicians cannot treat.
Additionally, consuming cakes, millet treats, malt jerky, roasted meats, dates, chestnuts, fruits, and other hard-to-digest items will inevitably lead to heat accumulation. Using purgatives to treat this will result in cold deficiency in the stomach, uncontrollable severe diarrhea, and difficult rescue.
For Hongxiangjiao (Hongxiangjiao, 香港脚/foot qi disease), sexual activity must be strictly avoided. Also strictly prohibit mutton, beef, fish, garlic, Hize Cai (Hize Cai, 蕺菜/Houttuynia), Songcai (Songcai, 菘菜/Chinese cabbage), turnip, bottle gourd, wine, noodles, butter, milk, deer meat, pork, chicken, goose, and duck. Although some formulas use carp heads, the aforementioned foods are strictly forbidden. Also avoid extreme anger, raw fruits, and sour/vinegar foods. Specifically avoid bottle gourds and Houttuynia; violating this may result in lifelong incurability.
For Zhengjia Pixi (Zhengjia Pixi, 症瘕癖积/abdominal masses and accumulations), avoid cold, raw, buttery, and slippery foods.
For vomiting, regurgitation, and diarrhea, avoid cold, raw, sour, slippery, and greasy foods.
For dysphagia, distension, fullness, and stubborn cold-related Qi disorders, avoid cold and raw foods.
For accumulated heat, avoid fish, alcohol, and hot wheat noodles.
For cough, hemoptysis, and hematemesis, avoid all hot-natured foods.
For Phlegm-Fluid retention, avoid alcohol and vinegar.
For Xiaoke (Xiaoke, 消渴/wasting-thirst syndrome/diabetes), avoid sexual activity.
For Shuiqi (Shuiqi, 水气/water qi/edema), avoid sheep heads, hooves, salt, and all salty foods.
While taking medication, do not consume raw Coriandri Herba (Huixu, 胡荽/cilantro) or any slippery foods. Also avoid fruits, fatty pork and dog meat, greasy broths, fish, and foods with strong odors. It is also stated that while taking medication, one should generally avoid contact with corpses and the pollution associated with childbirth.