咸，微寒。止渴除热，益气调中，补虚养血，消食止泻，充实脏腑，滑肥肌肤。
平胃止渴，消食除胀，宽胸下气，凉血进食。
食饱胀烦，大麦面炒香，白汤下，以愈为度。（验方第一。）
小儿胀烦欲睡，此伤乳也，用面微炒，水下一钱。（第二。）
麦芒入目，大麦煎洗即出。（第三。）
汤火伤，大麦炒黑为末，油合敷之。（第四。）
破伤肠出，大麦粥汤，洗肠纳入，但饮米糜，百日可愈。（第五。）
猝患淋痛，大麦三两煎汤，入姜汁、蜜代茶。（第六。）
小便不通，陈大麦秸煎汁服之。（第七。）
炒。
开胃补脾，和中宽肠，散气破血，通乳落胎。化一切米面果食，消诸般胀结痰气。
妇人乳胀，因丧子。水煎三钱，立效。（验方第一。）
胀饱，同莱菔子煎服。（第二。）
谷劳嗜卧，饱食便卧，四肢烦重，大麦芽三两、椒一两俱炒，干姜三两，为末，白汤下
二钱。（第三。）
甘，平，微寒，无毒。宽肠降气，磨积消痈。除白浊白带，治脾积泄泻。涂丹毒而消热
肿，
疗痢疾而止绞肠。
绞肠痧痛，用面炒焦，热水冲服。（验方第一。）
脾积痢疾，炒面，沙糖水合常服。（第二。）
赤肿热痛，醋合面敷之。（第三。）
嗽而上气，面四两，茶末二钱，蜜二两，水一碗，顺手搅千下，服之，良久气下不止，
即愈也。（第四。）
十水肿喘，同大戟末作饼，炙熟为末，茶下，以利为度。（第五。）
男子白浊，炒末，鸡子清合，丸豆大，每五十，盐水下。（第六。）
赤白带下。同上。（第七。）
噤口痢疾，每沙糖水下面二钱。（第八。）
痈疽发背，麦面、硫黄各二两，井水合饼，晒干，每用一饼，磨水敷之。痛令不痛，不
痛令痛。（第九。）
疮头黑凹，用面煮食即发起。（第十。）
痘疮溃烂，用面频敷。（十一。）
汤火伤，炒面水合敷，神效。（十二。）
男子败积，同大黄末酒下。（十三。）
女子败血。同上。（十四。）
头风畏冷，水调饼敷之，数作汗出愈。（十五。）
染发令黑（十六。）
噎食，荞麦秸烧灰淋汁，煎取白霜一钱，硼砂一钱，为末，每酒下五分。（十七。）
【性味】味道咸，性质微寒。能够止渴、清除热邪，益气、调和脾胃，补虚、滋养血液，消食、止住腹泻，充实脏腑，使肌肤滑润肥泽。
【功效】平复胃气以止渴，消除食积以除胀满，宽畅胸膈以降逆气，凉血以促进食欲。
【验方】
1. 饮食过饱导致腹胀烦闷，将大麦面炒香，用白开水送服，直到痊愈为止。（第一验方）
2. 小儿腹胀烦闷想睡觉，这是伤乳所致，将麦面轻微炒制，用水送服一钱。（第二验方）
3. 麦芒刺入眼中，用大麦煎汤清洗，芒刺即可排出。（第三验方）
4. 烫伤或火伤，将大麦炒黑研为粉末，与油混合后敷于患处。（第四验方）
5. 腹部受伤肠子脱出，用大麦粥汤清洗肠道并纳入体内，仅饮用米粥，百日可愈。（第五验方）
6. 突然患上淋证疼痛，取大麦三两煎汤，加入姜汁和蜂蜜代替茶饮。（第六验方）
7. 小便不通，用陈年的大麦秸秆煎汁服用。（第七验方）
【炮制：炒制后的功效】
开胃补脾，调和中焦、宽畅肠道，行气破血，通利乳汁、促使堕胎。能消化各种米面果食，消除各类胀结痰气。
【验方】
1. 妇人乳房胀痛，因丧子引起。用水煎服三钱，立即见效。（第一验方）
2. 腹胀饱闷，与大莱菔子（萝卜籽）同煎服用。（第二验方）
3. 谷劳病（因饮食过量导致的嗜睡倦怠），表现为吃饱后就躺卧，四肢烦重。取大麦芽三两、花椒一两均炒制，干姜三两，研为粉末，用白开水送服二钱。（第三验方）
【性味】味道甘，性质平，微寒，无毒。宽畅肠道、降逆气，磨积滞、消痈肿。清除白浊和白带，治疗脾积引起的泄泻。涂抹可治丹毒并消除热肿，治疗痢疾并缓解绞肠痛。
【验方】
1. 绞肠痧疼痛，将麦面炒焦，用热水冲服。（第一验方）
2. 脾积痢疾，炒麦面，用沙糖水调和常服。（第二验方）
3. 赤肿热痛，用醋调和麦面外敷。（第三验方）
4. 咳嗽伴气逆上冲，取麦面四两、茶末二钱、蜂蜜二两、水一碗，顺着同一方向搅拌千次，服用后，若良久气逆不止，即会痊愈。（第四验方）
5. 十种水肿伴气喘，与大戟粉末制作成饼，烤熟研为粉末，用茶水送服，以通利大便为度。（第五验方）
6. 男子白浊，炒成粉末，用鸡蛋清调和，制成如豆大的丸药，每次五十丸，用盐水送服。（第六验方）
7. 赤白带下。用法同上。（第七验方）
8. 噤口痢疾，每次用沙糖水送服麦面二钱。（第八验方）
9. 痈疽发背，取麦面、硫黄各二两，用井水调和成饼，晒干，每次取一饼，磨水外敷。能使痛的变不痛，不痛的变痛。（第九验方）
10. 疮头黑陷，煮食麦面即可使其发起。（第十验方）
11. 痘疮溃烂，频繁用麦面外敷。（第十一验方）
12. 烫伤火伤，用炒过的麦面加水调和外敷，效果神奇。（第十二验方）
13. 男子败积，与大黄粉末同酒送服。（第十三验方）
14. 女子败血。用法同上。（第十四验方）
15. 头风畏冷，用水调麦面饼敷之，多次出汗后即可痊愈。（第十五验方）
16. 染发使头发变黑。（第十六验方）
17. 噎食（吞咽困难），将荞麦秸秆烧成灰，淋取汁液，煎取白霜一钱，硼砂一钱，研为粉末，每次用酒送服五分。（第十七验方）
[Properties and Flavor] Salty, slightly cold. It can quench thirst, clear heat, benefit qi, harmonize the middle jiao (middle burner), tonify deficiency, nourish blood, digest food, stop diarrhea, solidify the zang-fu organs, and make the skin smooth and plump.
[Efficacy] Calms the stomach to quench thirst, resolves food stagnation to relieve distension, opens the chest to direct qi downward, cools blood to promote appetite.
[Verified Prescriptions]
1. For abdominal distension and irritability due to overeating: Roast barley flour until fragrant, take with plain boiled water, continue until cured. (Verified Prescription No. 1)
2. For infants with abdominal distension, irritability, and drowsiness, caused by milk injury: Lightly roast the flour, administer with water, one qian. (No. 2)
3. For barley awns entering the eye: Wash with decoction of barley; the awns will be expelled. (No. 3)
4. For burns or scalds: Charred barley powder mixed with oil applied topically. (No. 4)
5. For traumatic injury with evisceration: Clean the intestines with barley porridge soup, reduce them into the abdomen, and consume only rice gruel; recovery occurs within a hundred days. (No. 5)
6. For sudden onset of strangury pain: Decoct three liang of barley in water, add ginger juice and honey, drink as tea. (No. 6)
7. For urinary retention: Decoct old barley stalks and drink the juice. (No. 7)
[Preparation: Stir-fried]
Opens the appetite, tonifies the spleen, harmonizes the middle jiao, relaxes the intestines, moves qi, breaks blood stasis, promotes lactation, and induces abortion. It transforms all kinds of rice, flour, fruit, and food accumulations, and resolves various types of distension, congestion, phlegm, and qi stagnation.
[Verified Prescriptions]
1. For breast distension in women due to the loss of a child: Decoct in water, take three qian, immediate effect. (Verified Prescription No. 1)
2. For abdominal fullness and bloating: Decoct together with Raphani Semen (Radish Seed). (No. 2)
3. For Gu Lao disease (lethargy after eating): Characterized by lying down immediately after eating and heavy limbs. Take three liang of Mai Ya (Hordei Fructus Germinatus) and one liang of Zanthoxyli Pericarpium (Sichuan Pepper), both stir-fried, plus three liang of Sheng Jiang (Dried Ginger), grind into powder, take two qian with plain boiled water. (No. 3)
[Properties and Flavor] Sweet, neutral, slightly cold, non-toxic. Relaxes the intestines, directs qi downward, grinds down accumulations, and resolves carbuncles. Clears white turbidity and leukorrhea, treats spleen accumulation with diarrhea. Applied topically for erysipelas to reduce heat and swelling; taken internally for dysentery to relieve colicky intestinal pain.
[Verified Prescriptions]
1. For Jiao Chang Sha pain (colicky intestinal pain): Charred flour mixed with hot water and taken orally. (Verified Prescription No. 1)
2. For spleen accumulation dysentery: Stir-fried flour mixed with brown sugar water, taken regularly. (No. 2)
3. For red swelling, heat, and pain: Flour mixed with vinegar applied topically. (No. 3)
4. For cough with rebellious qi: Four liang of flour, two qian of tea powder, two liang of honey, one bowl of water. Stir thoroughly in one direction a thousand times, then take. If rebellious qi persists for a long time, it will subside and cure. (No. 4)
5. For ten types of edema with wheezing: Mix with Radix Euphorbiae Humifusae (Da Ji) powder, form into cakes, roast until cooked, grind into powder, take with tea water, stop when bowels are purged. (No. 5)
6. For male white turbidity: Powdered flour mixed with egg white, formed into pills the size of beans, take fifty pills at a time with salt water. (No. 6)
7. For red and white leukorrhea. Same method as above. (No. 7)
8. For Jin Kou Li (anorexia-associated dysentery): Take two qian of flour with brown sugar water. (No. 8)
9. For carbuncles on the back: Two liang of flour and two liang of Sulfur, mixed with well water into cakes, sun-dried. Use one cake per application, grind with water to apply topically. It turns pain into no pain, and no pain into pain. (No. 9)
10. For black, depressed sore heads: Boil and eat flour to raise the lesion. (No. 10)
11. For ulcerated smallpox: Frequently apply flour topically. (No. 11)
12. For burns and scalds: Stir-fried flour mixed with water applied topically, miraculous effect. (No. 12)
13. For male pathological accumulations: Taken with wine mixed with Rhizoma Rhei (Da Huang) powder. (No. 13)
14. For female blood stasis. Same method as above. (No. 14)
15. For head wind with aversion to cold: Flour paste applied topically with water; recover after sweating several times. (No. 15)
16. To dye hair black. (No. 16)
17. For dysphagia: Burn Fagopyri Caulis (Buckwheat Stem) to ash, leach with water, boil down to obtain one qian of white frost, mix with one qian of Borax, grind into powder, take five fen with wine. (No. 17)