雷尼替丁在人的胃中会形成致癌物 NDMA,其水平超过安全限值数千倍(每片高达 320,000 ng)。
原始表述
أكبر فضيحة سلامية كانت في 2019-2020 حين سُحب الرانيتيدين عالمياً بعد أن أظهرت تجارب براونستاين وآخرون (JAMA Open 2021) أنّ القرص الواحد يُولِّد NDMA المسرطنة تحت ظروف المعدة بمستويات تصل إلى 320 ألف نانوغرام — أعلى آلاف المرات من الحد المسموح.
非原话——为转述. 译文由本项目提供;以阿拉伯语原文为准。
译文
雷尼替丁在人的胃中会形成致癌物 NDMA,其水平超过安全限值数千倍(每片高达 320,000 ng)。
出处
- 来源状态
- 档案网站编辑
- 归属
- Archive editors (eltayebat.com); not verified as Elawady's own words
- 出处
- https://eltayebat.com/rule/acid-blockers/
- 归属的不确定性
- Written by the archive operators; study selection is the archive's, not necessarily Elawady's.
- 所声称的机制
Nitrosation of ranitidine under acidic, nitrite-rich gastric conditions.
- 所声称的健康影响
Cancer risk from NDMA.
- 涉及人群
Ranitidine users.
- Elawady 设定的地域限制
none found
科学评估
基本错误 – 该说法的主要部分没有证据支持,或被严重夸大。
证据确定性: 中 – 进一步研究仍可能影响该评估。
1. 说法是什么?
A ranitidine tablet produces huge amounts of NDMA inside the stomach.
2. 哪些内容可证实是正确的?
Ranitidine (an H2 blocker, not a PPI) was withdrawn from the market in 2019–2020 because of NDMA contamination; Braunstein 2021 measured up to 320,000 ng NDMA from a 150 mg tablet in simulated gastric fluid with 50 mmol/L sodium nitrite (minimum 947 ng at 1 mmol/L).
3. 哪些内容是错误或夸大的?
The archive presents a laboratory maximum under extreme nitrite conditions as what happens 'under the conditions of the stomach'. Under physiological nitrite no conversion was detected (I-PPI-118), the in-vivo FDA RCT did not find increased NDMA excretion (I-PPI-07), and no cancer excess was seen in 1.18 million users (I-PPI-117). Four of the seven Braunstein authors were affiliated with Valisure LLC, the laboratory that had filed the citizen petition to the FDA.
4. 哪些内容仍不明确?
Very long-term cancer risk after ranitidine has not been fully settled, but the largest cohort found no excess; product impurity levels (which rose with storage) are a separate issue from formation in the stomach.
5. 哪些研究支持该说法?
A-PPI-18 (in vitro).
6. 哪些研究与该说法相矛盾?
Florian 2021 (I-PPI-07): median paired difference in urinary NDMA 0 ng (P=.54) and -1.1 ng (P=.71). Gao 2021 (I-PPI-118): only background NDMA (21-24 ng) up to 5000 umol/L nitrite. You 2023 (I-PPI-117): cancer HR 1.04 (0.97-1.12) vs other H2RAs.
7. 对德国和欧洲而言情况如何?
Ranitidine is no longer marketed in the EU/Germany; this claim has no relevance for current PPIs such as pantoprazole or omeprazole.
8. 关于埃及的已知情况是什么?
Ranitidine products were also withdrawn in many countries after 2020; status in Egypt was not verified.
9. 合理的实际结论是什么?
雷尼替丁事件涉及的是一种 H2 受体阻滞剂以及一个污染/稳定性问题;它不能套用到 PPI 上。
评估详情
- 证据确定性的依据
The 320,000 ng figure comes from simulated gastric fluid with 50 mmol/L nitrite, about 500 times the upper physiological gastric nitrite (A-PPI-18). An FDA laboratory study found no NDMA formation at physiological nitrite and formation only at >=50-fold physiological levels (I-PPI-118); a double-blind crossover RCT found no increase in urinary NDMA after ranitidine (I-PPI-07); and a multinational active-comparator cohort of 1.18 million people found no cancer excess with ranitidine versus other H2 blockers (HR 1.04, 0.97-1.12; I-PPI-117). The 2019-2020 recall because of NDMA impurities in products did happen.
- 来源质量
In-vitro research letter (four of seven authors affiliated with the laboratory that petitioned the FDA) versus a small but direct human RCT.
- 地区可推广性
High.
- 个体例外情况
Effects in people with unusually high gastric nitrite cannot be excluded.
- 说法的地域范围
- 普遍性(生物学/医学)
- 最近审核
- 2026年10月26日 初步
科学证据详解
已被科学证据否定 – 高质量证据显示情况恰恰相反,或该说法与已确立的生理学知识相矛盾。
研究问题: Does ranitidine form NDMA in the human stomach at levels thousands of times above safety limits (up to 320,000 ng per tablet)?
研究问题详解 (PECO)
- 人群
- Ranitidine users / simulated gastric fluid
- 干预或暴露
- Ranitidine
- 对照
- Other H2RAs / placebo / physiological nitrite
- 地域范围
- universal pharmacology
- 结局指标
- NDMA formation in vivo/in vitro
- Cancer incidence
研究结果按作者报告呈现。我们的评估见下文。
哪些证据支持该说法?
Ranitidine and NDMA in the lab
Braunstein LZ et al.. JAMA Netw Open 2021 · PMID 33512515 · DOI 10.1001/jamanetworkopen.2020.34766 实验室 / 细胞研究已核查全文In-vitro study: up to 320,000 ng NDMA at 50 mmol/L nitrite in simulated gastric fluid.
- 实际结果
- 947-320,000 ng depending on nitrite (packet)
- 方法学质量
- low (in vitro, supraphysiological conditions; authors linked to the petitioning laboratory)
- 相关性
- indirect
- 局限
- Not physiological
哪些证据不支持该说法?
Ranitidine does not make NDMA in realistic stomach conditions
Gao Z et al.. JAMA Netw Open 2021 · PMID 34181009 · DOI 10.1001/jamanetworkopen.2021.18253 实验室 / 细胞研究已核查摘要新增FDA in-vitro study: no NDMA formation at physiological nitrite; formation only at >=50-fold physiological nitrite.
- 实际结果
- Background 21-24 ng up to 5000 umol/L; 11,822 ng at 10,000 umol/L
- 方法学质量
- moderate
- 相关性
- direct test of the claim
- 局限
- In vitro; erratum on figure captions
Does ranitidine form NDMA in people?
Crossover RCT in humans: no increase in urinary NDMA after ranitidine.
- 实际结果
- Median paired difference 0 ng (packet)
- 方法学质量
- moderate (small RCT)
- 相关性
- direct in vivo
- 局限
- n=18
No extra cancer with ranitidine
You SC et al.. JAMA Netw Open 2023 · PMID 37725377 · DOI 10.1001/jamanetworkopen.2023.33495 队列研究已核查摘要新增Multinational cohort of 1.18 million: no cancer excess vs other H2RAs.
- 实际结果
- HR 1.04 (0.97-1.12)
- 方法学质量
- high (active comparator, calibrated)
- 相关性
- direct for consequence
- 局限
- Follow-up length
总体证据说明了什么?
基于上述研究的编辑评估——其本身并非研究结果。
哪种观点有更好的证据支持?
The recall due to NDMA impurities in products was real, but in-stomach formation at the claimed levels is not supported under physiological conditions, and no cancer excess was found.
为什么有些研究权重更大
Physiological in-vitro, human RCT and large cohort data agree and outweigh one supraphysiological laboratory study.
因果关系是否已确立? 尚未确立 No in-vivo evidence of large NDMA formation.
仍存在的不确定性
Product impurity levels over shelf life (a separate issue).
合理的结论
Mostly false.
为什么研究结果看起来互相矛盾?
Braunstein used 500 times the upper physiological nitrite; the apparent conflict is explained by test conditions.
这是否取决于国家?
- 一般生物学效应
- Pharmacology of PPIs is the same in Egypt and Europe.
- 饮食习惯
- Not decisive.
- 食品原产地
- Not relevant.
- 污染物
- Not relevant (except ranitidine NDMA impurities, C-PPI-08).
- 本国生产条件
- Generic products are used in both regions; no evidence of different pharmacological effects.
- 法律规则
- PPIs are partly available without prescription in Egypt and (small packs, short-term) in the EU; prescribing practices differ.
- 实际监测数据
- No Egyptian outcome data identified; one Egypt/Iraq pharmacist survey (I-PPI-120).
足以改变结论的地区差异没有可靠数据支持。
统计复核
- Nitrite ratio between test conditions – Braunstein maximum = 500 x upper physiological nitrite 已重新计算
- Absolute difference and CI – 0.27 per 1000 PY; HR 1.04 (0.97-1.12) consistent 已重新计算
总体证据的确定性(GRADE,简化版)
- 主要结局
- In-vivo NDMA formation and cancer risk from ranitidine
- 起始等级
- 低(观察性研究)
- 升级理由
- consistency across in-vitro, RCT and cohort evidence
- 结果
- 中
由单名审查者参照 GRADE 方法进行的简化评估;并非正式的 GRADE 专家组评估。GRADE 评价的是针对某一结局的整体证据,而非单项研究。
检索策略
本次审查的文献检索记录(检索式采用原数据库语法)。
| 数据库 | 日期 | 检索式 | 检索目标 | 命中数 | 纳入数 |
|---|---|---|---|---|---|
| Europe PMC | 2026年10月26日 | TITLE:ranitidine AND TITLE:(cancer OR NDMA OR "N-nitrosodimethylamine") AND PUB_YEAR:[2020 TO 2026] | 双向 | 38 |
待解决的问题
Very long-term cancer follow-up.
核查深度如何?
4 项相关研究:1 项核查了全文(其中 0 项进行了结构化偏倚风险评估),3 项基于摘要核查,0 项仅核查了文献信息。 尚未进行由两名独立审查者完成的正式评估,也尚未进行独立的人类专家审核。
最近一次科学审核: 2026年10月26日
评定结论的变更历史
- 2026年10月25日 · 第 1 阶段 · 初始评估: 可能错误 (低)
- 2026年10月26日 · 第 4 阶段(系统证据审查) · 评定结论已更改: 可能错误 (低) → 基本错误 (中)
Changed: the FDA physiological-condition study and the 1.18-million-person active-comparator cohort, together with the human RCT, now consistently contradict in-stomach formation at harmful levels.
新来源: I-PPI-117 I-PPI-118
通俗解释
雷尼替丁是一种较老的抑酸药,因为一些产品含有污染物 NDMA 而被撤出市场。一项实验室研究发现了非常高的 NDMA 生成量,但前提是亚硝酸盐水平比胃中的正常水平高约 500 倍。在正常胃内条件下的检测、一项人体试验以及一项针对一百多万名使用者的研究,都没有发现有意义的 NDMA 生成或癌症增多的迹象。现代 PPI 是不同的药物。
与该说法相关的研究
支持该说法的研究 (1)
-
Ranitidine and NDMA in the lab
Braunstein LZ et al.. JAMA Netw Open 2021 · PMID 33512515 · DOI 10.1001/jamanetworkopen.2020.34766实验室 / 细胞研究被 Tayebat 档案网站引用已核查全文★ 关键研究In simulated stomach fluid with very high nitrite, a tablet produced up to 320,000 ng NDMA.
该研究是否支持这一具体说法? 部分支持 · 方法学质量: 低 · 证据确定性:见该说法的总体评估
研究通俗解读
- 研究人员想了解什么?
NDMA formation conditions.
- 研究是如何开展的?
Lab experiment.
- 研究了多少人、动物或样本?
Tablets in simulated gastric fluid.
- 实际发现了什么?
NDMA rose with nitrite and acidity.
- 观察到的效应有多大?
947–320,000 ng (150 mg).
- 研究结果对日常生活意味着什么?
Chemically possible, human relevance unclear.
- 该研究有哪些局限?
In vitro; extreme nitrite; COI.
- 它对 Elawady 的具体说法说明了什么?
Supports recall, not in-vivo levels.
- 研究结果是否适用于德国和欧洲?
Drug not marketed in EU.
- 从该研究中明确不能得出什么结论?
Human gastric NDMA levels.
该组中没有被标记为关键研究的研究。
与该说法相矛盾或限制该说法的研究 (3)
-
Does ranitidine form NDMA in people?
Florian J et al.. JAMA 2021 · PMID 34180947 · DOI 10.1001/jama.2021.9199随机对照试验独立交叉核查已核查摘要★ 关键研究Ranitidine did not raise NDMA in urine compared with placebo.
该研究是否支持这一具体说法? 否 · 方法学质量: 中 · 证据确定性:见该说法的总体评估
研究通俗解读
- 研究人员想了解什么?
In-vivo NDMA.
- 研究是如何开展的?
Crossover RCT.
- 研究了多少人、动物或样本?
18 healthy adults.
- 实际发现了什么?
No increase.
- 观察到的效应有多大?
Median difference 0 ng.
- 研究结果对日常生活意味着什么?
Lab extremes not seen in people.
- 该研究有哪些局限?
Small; urinary marker.
- 它对 Elawady 的具体说法说明了什么?
Contradicts C-PPI-08.
- 从该研究中明确不能得出什么结论?
Long-term cancer risk.
-
No extra cancer with ranitidine
You SC et al.. JAMA Netw Open 2023 · PMID 37725377 · DOI 10.1001/jamanetworkopen.2023.33495队列研究独立交叉核查已核查摘要★ 关键研究In 1.2 million people from 7 countries, ranitidine users developed cancer no more often than users of similar drugs.
No cancer excess vs other H2RAs (HR 1.04, 0.97-1.12)
该研究是否支持这一具体说法? 否 · 方法学质量: 高 · 证据确定性:见该说法的总体评估
研究通俗解读
- 研究人员想了解什么?
Check cancer risk after ranitidine.
- 研究是如何开展的?
Multinational cohort.
- 研究了多少人、动物或样本?
1,183,999 users.
- 实际发现了什么?
HR 1.04 (0.97-1.12).
- 观察到的效应有多大?
0.27 per 1000 PY difference.
- 研究结果对日常生活意味着什么?
Past ranitidine use is unlikely to have caused cancer.
- 该研究有哪些局限?
Limited follow-up.
- 它对 Elawady 的具体说法说明了什么?
Contradicts '320,000 ng in the stomach' implications.
- 研究结果是否适用于德国和欧洲?
Includes Europe.
- 从该研究中明确不能得出什么结论?
Cannot exclude very long-term effects.
-
Ranitidine does not make NDMA in realistic stomach conditions
Gao Z et al.. JAMA Netw Open 2021 · PMID 34181009 · DOI 10.1001/jamanetworkopen.2021.18253实验室 / 细胞研究独立交叉核查已核查摘要★ 关键研究FDA tests found NDMA formation only at nitrite levels at least 50 times above normal stomach levels.
No NDMA formation at physiological nitrite
该研究是否支持这一具体说法? 否 · 方法学质量: 中 · 证据确定性:见该说法的总体评估
研究通俗解读
- 研究人员想了解什么?
Test NDMA formation from ranitidine in simulated stomach fluid.
- 研究是如何开展的?
Laboratory study.
- 研究了多少人、动物或样本?
Ranitidine tablets.
- 实际发现了什么?
Only background NDMA at physiological nitrite.
- 观察到的效应有多大?
21-24 ng background vs 11,822 ng at extreme nitrite.
- 研究结果对日常生活意味着什么?
The huge laboratory numbers do not reflect the real stomach.
- 该研究有哪些局限?
In vitro only.
- 它对 Elawady 的具体说法说明了什么?
Contradicts the claim.
- 研究结果是否适用于德国和欧洲?
Universal.
- 从该研究中明确不能得出什么结论?
Does not address contamination already present in tablets.
该组中没有被标记为关键研究的研究。
结果不一或不明确的研究 (0)
该组中没有研究。
地区背景
德国 / 欧盟
Ranitidine is no longer marketed in the EU/Germany; this claim has no relevance for current PPIs such as pantoprazole or omeprazole.
埃及
Ranitidine products were also withdrawn in many countries after 2020; status in Egypt was not verified.
- Food-safety governance and official controls
- Pesticide residues in fruit and vegetables on the EU/German market (incl. imports from Egypt)
- Pesticide residues in produce sold on the Egyptian domestic market
- Antibiotic (veterinary drug) residues in poultry meat and eggs
- Antimicrobial use in food animals and antibiotic growth promoters
- Hormones in poultry, meat, milk and farmed fish
- Dioxins, PCBs and PFAS in eggs and other animal foods
- Aflatoxin M1 in milk and dairy products
- Aflatoxins in groundnuts (peanuts)
- Heavy metals in fish
- Farmed fish (aquaculture): drugs, water source and controls
- Import controls and the meaning of RASFF notifications for Egyptian products
在我的国家适用什么?
一般科学评估
基本错误 基本错误:召回是真实的,但"胃中 320,000 ng"这一数字来自极端的实验室条件,在接近真实的条件下或人体中均未发现。
以下食品安全领域与该说法相关:
- 农药与农药残留
- 兽药与抗生素
- 激素类促生长剂
- 污染物(重金属、PFAS、PCB、二噁英、硝酸盐)
蛋类 · 禽类 · 乳制品 · 鱼类与海产品 · 红肉 · 水果与蔬菜
选择一个国家,查看针对该国已核查的信息。
局限:法律规则描述的是允许什么,而不是每一种食品实际含有什么。检测数据来自样本,只有结合其方法细节才有意义。
参考文献
- Analysis of Ranitidine-Associated N-Nitrosodimethylamine Production Under Simulated Physiologic Conditions.. Braunstein LZ et al.. JAMA Netw Open 2021 · PMID 33512515 · DOI 10.1001/jamanetworkopen.2020.34766
- Effect of Oral Ranitidine on Urinary Excretion of N-Nitrosodimethylamine (NDMA): A Randomized Clinical Trial.. Florian J et al.. JAMA 2021 · PMID 34180947 · DOI 10.1001/jama.2021.9199
- Ranitidine Use and Incident Cancer in a Multinational Cohort.. You SC et al.. JAMA Netw Open 2023 · PMID 37725377 · DOI 10.1001/jamanetworkopen.2023.33495
- In Vitro Analysis of N-Nitrosodimethylamine (NDMA) Formation From Ranitidine Under Simulated Gastrointestinal Conditions.. Gao Z et al.. JAMA Netw Open 2021 · PMID 34181009 · DOI 10.1001/jamanetworkopen.2021.18253