Metformin Recall

Metformin, a commonly prescribed medication for managing Type 2 diabetes, has been under the microscope recently due to recalls tied to the presence of N-nitrosodimethylamine (NDMA) levels exceeding the FDA’s acceptable intake limit.

1. What’s the Concern with Metformin?

The root of the issue lies with the detection of NDMA, a potential carcinogen, in certain batches of metformin. NDMA’s presence above the allowable limit prompted the FDA to recommend recalls of affected batches.

2. Companies Involved in the Recall

Viona Pharmaceuticals Inc.: This company issued recalls for specific lots of Metformin Hydrochloride Extended-Release Tablets, USP 750 mg, on multiple occasions in 2021 due to NDMA concerns.

Nostrum Laboratories, Inc.: In January 2021, Nostrum voluntarily recalled a lot of their Metformin HCl Extended Release Tablets, USP 750 mg.

Granules Pharmaceuticals, Inc.: In July 2020, the company voluntarily recalled twelve lots of their Metformin Hydrochloride Extended-Release Tablets USP.

and various others mentioned in the FDA alerts.

3. Why is NDMA a Concern?

N-nitrosodimethylamine (NDMA) is classified as a probable human carcinogen based on animal testing results. While it’s commonly found in water and foods, including meats, dairy products, and vegetables, its prolonged exposure at high levels might increase cancer risks.

4. How to Check if Your Metformin is Affected

The FDA provides a search list for users to identify recalled metformin products. Before discontinuing any medication, it’s vital to consult with your healthcare provider.

5. The Present Stance on Metformin Safety

Not all metformin products are contaminated with NDMA. The FDA continues to recommend metformin for Type 2 diabetes management due to its proven health benefits. However, users are advised to remain informed and regularly check for updates on recalls.

6. Key Questions Answered

What brand of metformin is being recalled? Various brands, such as Viona Pharmaceuticals and Nostrum Laboratories, have had recalls, with specific batches affected.

Why is metformin being taken off the market? Only specific batches with NDMA levels above acceptable limits are being recalled, not all metformin products.

Is metformin safe to use now? Metformin remains a recommended treatment for Type 2 diabetes. However, consumers should stay informed about recalls and consult with healthcare providers about any concerns.


While the detection of NDMA in some metformin batches is undoubtedly concerning, it’s essential to differentiate between the batches affected by recalls and the broader safety of metformin. Always consult a healthcare provider before making any changes to medication and stay informed through reliable sources like the FDA.

FAQs on Metformin Recall

Q1: What Exactly is NDMA and Why Is It Harmful?

A: NDMA, or N-nitrosodimethylamine, is an organic compound found in low levels in certain foods and water sources. While low levels are generally considered harmless, prolonged exposure to higher concentrations is linked to an increased risk of cancer in animal studies, which is why it’s categorized as a probable human carcinogen.

Q2: How Did NDMA End Up in Metformin?

A: The presence of NDMA in medications can result from the manufacturing process or from the raw materials used. The exact cause of NDMA contamination in specific metformin batches is still under investigation, though it’s believed to be associated with certain production methods.

Q3: Are All Forms and Dosages of Metformin Affected?

A: No, only specific lots and brands have been identified with NDMA levels above acceptable limits. It’s essential to consult the FDA’s list or your healthcare provider to determine if your specific medication is affected.

Q4: If My Metformin is on the Recall List, What Should I Do?

A: Do not stop taking your medication abruptly. The risks of stopping metformin without an alternative can be significant. Consult your healthcare provider immediately for guidance on a safe transition or a potential switch to a different medication.

Q5: How is the FDA Ensuring Future Batches of Metformin Are Safe?

A: The FDA has intensified its testing and scrutiny of metformin batches entering the US market. Additionally, the agency is working closely with manufacturers to ensure stringent quality control measures, aiming to prevent future NDMA contamination.

Q6: Are Recalled Metformin Batches Only a Concern in the US?

A: The concerns regarding NDMA in metformin have been raised globally, prompting recalls in other countries as well. Regulatory bodies worldwide are working together and sharing information to ensure patient safety.

Q7: Does NDMA Contamination Mean Metformin is Ineffective?

A: No, the presence of NDMA does not affect the efficacy of metformin in managing Type 2 diabetes. The recalls are issued due to safety concerns related to NDMA, not the drug’s effectiveness.

Q8: How Can I Stay Updated on Drug Recalls and Safety Concerns in the Future?

A: The FDA provides continuous updates on drug recalls and safety concerns on their official website. Subscribing to their notifications or regularly checking their ‘Drug Safety and Availability’ section will ensure you stay informed.

Q9: Are Other Diabetes Medications Also at Risk of NDMA Contamination?

A: While the current focus has been on metformin, the FDA has been investigating various drugs for NDMA and other nitrosamine impurities. It’s crucial for consumers to stay informed and consult with healthcare providers about any medication concerns.

Q10: Has NDMA Contamination Resulted in Any Reported Health Issues Among Metformin Users?

A: As of now, there haven’t been direct links established between NDMA-contaminated metformin and specific health issues in patients. However, the recall is a proactive measure to prevent potential long-term risks associated with NDMA exposure.

Q11: Why Did Some Companies Continue to Produce Contaminated Metformin?

A: The contamination of certain metformin batches was unintentional. Often, impurities like NDMA can result from the manufacturing process or the degradation of specific compounds over time. Once detected, most companies took swift action to rectify the situation.

Q12: Is It Possible for NDMA to Form in Metformin If Stored for an Extended Period or Under Specific Conditions?

A: Environmental conditions such as high temperatures can accelerate the degradation of certain compounds in medications, leading to the formation of impurities like NDMA. It’s always advisable to store medications as per the guidelines mentioned on the label.

Q13: If I’ve Been Taking Contaminated Metformin for Years, Should I Be Concerned About My Health?

A: While prolonged exposure to high levels of NDMA is of concern, it’s essential to understand that the risk is based on cumulative exposure. If you have concerns about long-term ingestion, consult with a healthcare professional to assess potential risks and necessary screenings.

Q14: Are Generics More Prone to Contamination Than Brand Name Drugs?

A: No, the quality and safety standards are the same for both generic and brand name drugs. The FDA ensures that all medications, irrespective of being generic or brand name, meet the same stringent standards. Contaminations can occur in any production batch, regardless of its brand status.

Q15: How Are Companies and the FDA Working to Prevent Future NDMA Contaminations?

A: The FDA and pharmaceutical companies are investing in advanced detection methods to identify impurities at even lower levels. They’re also refining manufacturing processes and enhancing quality control to minimize the risk of future contaminations.

Q16: Are There Alternatives to Metformin That I Can Consider?

A: Yes, there are multiple medications available for managing Type 2 diabetes. If you’re considering switching from metformin due to concerns or any other reason, discuss with your healthcare provider to determine the best alternative tailored to your health needs.

Q17: What Steps Should I Take If I Experience Adverse Effects After Taking Metformin?

A: Any adverse effects, whether related to the recent recall or not, should be reported to a healthcare professional immediately. Additionally, patients can report side effects directly to the FDA through the MedWatch Voluntary Reporting Form available on their website.

Q18: How Are Other Countries Responding to NDMA Contamination in Metformin?

A: Many regulatory bodies worldwide, such as Health Canada and the European Medicines Agency, have taken similar proactive measures as the FDA, including the recall of affected batches and enhanced screenings of metformin products.

Q19: Will There Be a Shortage of Metformin Due to the Recalls?

A: While the recall did affect specific batches, it didn’t eliminate the entire supply. The FDA, in collaboration with manufacturers, is ensuring that there’s an adequate supply of uncontaminated metformin in the market to meet patient needs.

Q20: Is There a Reliable Way for Patients to Test Their Metformin for NDMA At Home?

A: Currently, there’s no reliable at-home test for NDMA in medications. Testing for NDMA requires sophisticated laboratory equipment. If concerned about your medication, it’s best to consult with a pharmacist or healthcare provider.

Q21: If NDMA is found in certain foods, why is its presence in Metformin alarming?

A: While NDMA is present in certain foods and water in minimal amounts, the concern arises when the intake level surpasses the acceptable daily intake. Prolonged exposure to elevated levels, especially in medication taken daily, can potentially increase cancer risk over time.

Q22: What actions can consumers take to ensure they’re receiving safe medications?

A: Stay informed by regularly checking updates from authoritative sources like the FDA. When a new prescription is given or medication is refilled, patients should feel empowered to ask pharmacists about its safety and any recent recalls.

Q23: How do regulatory agencies determine ‘acceptable levels’ of impurities like NDMA in drugs?

A: Regulatory bodies assess the potential risks of impurities based on scientific studies. The “acceptable levels” are determined based on the amount of the impurity that would be expected to increase cancer risk by no more than 1 in 100,000 over a person’s lifetime.

Q24: Why don’t pharmaceutical companies test for these impurities before the release of drugs?

A: Many companies do conduct extensive quality control tests. However, certain impurities may not have been a known risk at the time or were not detectable with earlier testing methods. Advances in detection technology have now made it possible to detect even trace amounts of such impurities.

Q25: How can consumers be certain that the alternative drugs to Metformin are safe from similar impurities?

A: Any medication approved for market undergoes rigorous testing. However, no process is entirely immune to unforeseen issues. That said, regulatory agencies continuously monitor all medications for safety concerns and take action when necessary.

Q26: How often does the FDA inspect pharmaceutical manufacturing facilities?

A: The FDA regularly inspects domestic and international manufacturing facilities to ensure they adhere to good manufacturing practices. The frequency of these inspections can vary based on a facility’s history, the type of drug being produced, and other risk factors.

Q27: If my medication is on the recall list, how soon should I stop taking it?

A: You should never stop taking your medication abruptly without consulting a healthcare provider. If you discover your medication is on the recall list, get in touch with your doctor to discuss the best course of action.

Q28: What environmental factors can increase the degradation of Metformin into NDMA?

A: Factors like exposure to high temperatures, humidity, and direct sunlight can potentially influence the stability of medications, leading to faster degradation and possibly resulting in the formation of impurities.

Q29: How transparent are pharmaceutical companies expected to be when impurities are discovered?

A: Regulatory guidelines require companies to immediately report any quality or safety issues with their products. This ensures swift action in terms of recalls or other necessary measures to protect public health.

Q30: Are there preventive measures consumers can adopt to reduce the risk associated with drug impurities?

A: While consumers rely on regulators and manufacturers for drug safety, they can also store medications correctly, stay informed about recalls, and maintain open communication with healthcare providers to promptly address any concerns.


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