25,729 articles
Pyrovalerone
Pyrovalerone is a synthetic cathinone stimulant developed in the 1960s to treat lethargy, fatigue, and obesity, and withdrawn from medical use after reports of abuse. It inhibits the dopamine and norepinephrine transporters.
Pyruvate carboxylase deficiency
Pyruvate carboxylase deficiency (PC deficiency), a rare autosomal recessive disorder of the PC gene at 11q13.4-q13.5, causing lactic acidosis; types A, B, and C differ in severity.
Pyruvate dehydrogenase deficiency
Pyruvate dehydrogenase deficiency (PDHD, PDCD) is a genetic mitochondrial disorder impairing conversion of pyruvate to acetyl-CoA, causing congenital lactic acidosis and neurological degeneration; mostly X-linked PDHA1, treated with ketogenic diet and dichloroacetate.
Pyruvate kinase deficiency
Pyruvate kinase deficiency (PKD, CNSHA2) is an autosomal recessive PKLR-gene glycolytic enzyme defect causing chronic hemolytic anemia, gallstones, and iron overload; treated with transfusions, splenectomy, and the FDA-approved activator mitapivat (Pyrukynd, 2022).
Pythiosis
Pythiosis is an often-fatal infection of humans and animals caused by the aquatic oomycete Pythium insidiosum, acquired from waterborne zoospores; treated mainly by surgery plus immunotherapy, with high mortality in dogs and vascular disease.
Pyuria
Pyuria, also called leukocyturia, is white blood cells in the urine, a marker of urinary tract inflammation. Sterile pyuria is persistent pyuria with negative bacterial culture, caused by recent antibiotics, atypical infections, or systemic disease.
Q-space trajectory imaging
Q-space trajectory imaging (QTI) is a diffusion MRI method that uses time-varying gradients and a tensor distribution model to measure tissue microstructure properties like microscopic anisotropy.
Qiangen San
茜根散 (Qiangen San), "Madder Root Powder," a classic TCM hemostatic formula; Jingyue Quanshu version (茜根, 黄芩, 阿胶, 侧柏叶, 生地黄, 甘草) for yin-deficiency nosebleed; listed in China's 2023 Ancient Classic Famous Formula Catalog, second batch.
Qianzheng San
牵正散 (Qianzheng San, Face-Correcting Powder) is a classical Chinese medicine formula of baifuzi, baijiangcan, and quanxie in equal parts, first recorded in Yang Tan's Southern Song Yangshi Jiacang Fang, used for wind-phlegm facial deviation and listed in China's 2023 classic formula catalogue.
Qifang Bitong tablets
Qifang Bitong tablets (芪防鼻通片, formerly Yuping Tongqiao tablets) are a Class 1.1 innovative traditional Chinese medicine from Yiling Pharmaceutical, approved in China in January 2025 for persistent allergic rhinitis with lung-spleen deficiency, and in Macau in July 2025.
Qigong (气功)
Qigong (气功), also known as chi kung, is a traditional Chinese mind-body practice developed in China that combines gentle movement, controlled breathing, and mental focus to improve and maintain health and well-being.
Qijiao Tiaojing granules
Qijiao Tiaojing granules (芪胶调经颗粒) is a nine-herb traditional Chinese medicine prescription granule by Hunan Anbang, NMPA-approved December 2022 for IUD-induced prolonged menstruation with qi and blood deficiency syndrome.
Qingfei Decoction
清肺汤 (Qingfei Decoction; Japanese seihaitō) is a classic TCM formula for cough with phlegm, from Gong Tingxian's Wanbing Huichun, 13 herbs, listed in China's 2018 first batch of ancient classic prescriptions; Japan uses a 16-herb variant.
Qingfei Paidu granules
Qingfei Paidu granules (清肺排毒颗粒), a Chinese herbal formula derived from the Qingfei Paidu decoction of four Shanghan Zabing Lun formulas, NMPA-approved March 2021 for COVID-19, reimbursed nationally, and approved over the counter in Canada.
Qingjin Huatan Tang
清金化痰汤 (Qingjin Huatan decoction), an 11-herb Ming-era TCM formula from Ye Wenling's Yixi Tongzhi that clears lung heat and transforms phlegm for fire-type cough with yellow sputum; a 2018 national classic formula.
Qingre Tang
清热汤 (Qingre Tang) is a Mongolian medicine heat-clearing decoction from the 19th-century 《秘诀方海》, listed in China's second batch Ancient Classic Formulas Directory (2023); six-ingredient coarse powder, 0.6–1 qian three times daily.
Qingwei San
清胃散 (Qingwei San, Stomach-Clearing Powder) is a Jin-dynasty formula by Li Dongyuan from Lan Shi Mi Cang, five herbs clearing stomach fire for toothache and gum disease; now a listed classic formula with modern RCT and quality-control research.
Qingwei Tang
Qingwei Tang (清胃汤, "Stomach-Clearing Decoction") is the shared name of several traditional Chinese medicine formulas, recorded in different classical formularies, that clear accumulated heat from the stomach and Yangming channels.
Qingxin Lianzi Yin
清心莲子饮 (Qingxin Lianzi Yin), also called 莲子清心饮, is a nine-herb Song dynasty formula from the Taiping Huimin Heji Jufang that clears heart fire, boosts qi and yin, and treats chronic urinary diseases such as IgA nephropathy.
Qingzao Jiufei Tang
清燥救肺汤 (Qingzao Jiufei Decoction), a classical Chinese formula from Yu Chang's Yimen Falü, treats warm-dryness lung injury with qi-yin damage; nine herbs including mulberry leaf and calcined gypsum; listed in China's 2018 classical formula catalogue.
Qinwei Granules
Qinwei Granules (秦威颗粒, formerly Niantong Qufeng Granules) is a Category 1.1 traditional Chinese medicine, a four-herb granule approved by China's NMPA in March 2024 for acute gouty arthritis with wind-dampness-heat syndrome, supported by a placebo-controlled phase III trial.
Qirui Weishu capsules
Qirui Weishu capsules (七蕊胃舒胶囊), a Chinese class 1.1 innovative TCM by Jianmin Pharmaceutical Group, approved 31 December 2021 for epigastric pain in chronic non-atrophic gastritis with erosion, damp-heat stasis syndrome; entered China's 2022 national reimbursement list.
Qizhi Yishen capsules
Qizhi Yishen capsules (芪蛭益肾胶囊), a Class 1.1 innovative Chinese medicine by Shandong Phoenix Pharmaceutical approved November 2021 for early diabetic kidney disease with qi-yin deficiency pattern; first such TCM drug, reimbursed nationally since 2023.
QRISK
QRISK is a clinical risk calculator that estimates a person's ten-year risk of cardiovascular disease from routine primary care data; a QRISK3 score of 10% or more triggers a statin recommendation.
QRS complex
QRS complex: the ECG deflections representing ventricular depolarization; normal duration up to 0.10 s, wide (>120 ms) in ventricular tachycardia, bundle branch block, or pacing; named by Einthoven.
QRS detection
QRS detection, also known as QRS complex detection, locates the QRS complexes in an electrocardiogram recording, marking each heartbeat so heart rate can be measured.
qSOFA
qSOFA (quick Sequential Organ Failure Assessment) is a bedside score of 0 to 3 that flags adults with suspected infection at higher risk of sepsis death.
QT interval
QT interval: ECG span from QRS onset to T-wave end, measuring ventricular depolarization and repolarization. Corrected to QTc via Bazett or Fridericia formulas; QTc over 500 ms signals torsades de pointes risk.
Quackery
Quackery: deceptive promotion of unproven health products, services, or regimens for financial gain; also called health fraud. Covers patent-medicine history, placebo psychology, FDA/FTC regulation, harms, and social-media spread.
Quackwatch
Quackwatch: network of websites on health quackery founded by retired psychiatrist Stephen Barrett, now maintained by the Center for Inquiry; covers chiropractic, homeopathy, naturopathy, and cancer-treatment claims.