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Signs metformin is not working

LEARN THE SYMPTOMS THAT INDICATE METFORMIN MAY NOT WORK AND WHAT TO DO NEXT TO MANAGE TYPE 2 DIABETES OR PCOS

Key takeaways

  • label for weight management. It works by improving the body’s sensitivity to insulin and reducing glucose production in the liver.

  • Rising or persistently high blood sugar levels may be a sign that metformin is not adequately controlling blood glucose. If this happens, talk with your healthcare provider, who may adjust the dose or consider another treatment.

  • If metformin alone isn’t providing enough control, a healthcare provider may consider other medications, such as SGLT2 inhibitors, GLP-1 receptor agonists, thiazolidinediones, DPP-4 inhibitors, or sulfonylureas, depending on the individual’s needs. Lifestyle changes, including a balanced diet and regular physical activity, may also be part of the treatment plan.

Chronic kidney disease is generally not reversible because the damage and scarring to the kidneys can become permanent. However, some cases of acute kidney injury, including those caused by medication overuse, may be reversible when identified and treated early.

Dr. Greenwell explains that when kidney damage is first detected, healthcare providers should consider whether there is an acute and potentially reversible cause. If kidney function was normal recently and then declined suddenly, there may be a greater opportunity for recovery compared with damage that has developed over many years.

Once long-term kidney damage is established, the focus typically shifts from trying to reverse it to slowing its progression and preserving remaining kidney function. Some people with CKD can remain at a stable level of kidney function for many years with appropriate management, potentially delaying the need for dialysis or a transplant.

If you have kidney disease or abnormal kidney test results, talk with your healthcare provider about the best ways to protect your remaining kidney function and slow the progression of the condition.

Signs metformin is not working

The full effect of metformin on blood glucose control may take two to three months to become apparent, although improvements can sometimes be detected within one to two weeks. Over time, however, metformin may become less effective for some people and may no longer control blood sugar as well as it once did.

Several changes in your blood sugar levels, symptoms, or test results may indicate that metformin is no longer working effectively.

Type 2 diabetes and prediabetes 

A rise in blood sugar levels, known as hyperglycemia, may be an early indication that metformin is no longer controlling blood glucose as effectively as before in someone with Type 2 diabetes or prediabetes. Possible symptoms include:

  • Elevated blood sugar
  • Increased thirst or hunger
  • Blurred vision
  • Frequent urination
  • Headaches
  • Fatigue or weakness
  • Unexplained weight loss
  • Recurrent vaginal or skin infections
  • Cuts or sores that heal slowly

If these symptoms occur, a healthcare professional may order a hemoglobin A1C (HbA1c) test. This test provides an estimate of average blood glucose levels over the previous two to three months and can help determine whether blood sugar control has changed.

If metformin is no longer adequately controlling blood glucose, a healthcare provider may consider adjusting the dose, adding or changing medication, or using insulin, depending on the individual’s condition and treatment goals. Do not change or stop diabetes medication without discussing it with your healthcare provider.

PCOS

When metformin is prescribed for polycystic ovary syndrome (PCOS), it may take several months before its effects on menstrual cycles and fertility become noticeable. According to the Office on Women’s Health, treatment response can vary from person to person.

If, after several months, there is no improvement in menstrual regularity, ovulation, acne, excessive hair growth, or weight-related symptoms, talk with your healthcare provider. They can evaluate whether metformin is providing the intended benefits and whether adjustments to your PCOS treatment plan may be appropriate.

Weight loss

Metformin is sometimes prescribed off-label to support weight loss, although it is primarily used to manage blood sugar in conditions such as Type 2 diabetes.

If you are taking metformin as prescribed, following the lifestyle changes recommended by your healthcare provider, and do not notice any weight change after several months, talk with your provider. They can determine whether your treatment plan should be adjusted.

If you have elevated blood sugar, your provider may recommend continuing metformin even if you do not lose weight, because the medication may still be helping control your blood glucose levels.

What to do if metformin is not working

If you suspect that metformin is no longer working effectively, contact your healthcare provider first. Metformin may take time to produce its full effects, so a lack of immediate improvement does not necessarily mean the medication has stopped working.

Some side effects can be serious. Seek prompt medical attention if you experience concerning symptoms such as chest pain, a severe rash, or other signs of a serious reaction.

If your healthcare provider determines that metformin is not adequately controlling your blood sugar, they may adjust your treatment plan. This could involve changing the dose, adding another medication, or switching to a different treatment. Many people with diabetes eventually need more than one medication to maintain appropriate blood glucose control.

Do not stop or change your metformin dose on your own without guidance from your healthcare provider.

Alternatives to metformin

Metformin belongs to a class of medications called biguanides. Biguanides help lower blood sugar by reducing the amount of glucose produced by the liver and improving the body’s sensitivity to insulin.

Some combination medications, such as Synjardy, Invokamet, and Trijardy XR, contain metformin along with medications from other drug classes and are also used to help manage Type 2 diabetes.

Medication is typically used alongside healthy eating, regular physical activity, and other lifestyle changes. Depending on a person’s blood sugar levels, health conditions, and treatment goals, healthcare providers may also consider medications from other drug classes, including:

1. SGLT2 inhibitors

Instead, more glucose is removed from the body through the urine, which can help lower blood glucose levels.

Medications in the SGLT2 inhibitor class include:

2. GLP-1 receptor agonists 

GLP-1 receptor agonists are commonly used for Type 2 diabetes, weight loss, and cardiovascular risk reduction—the FDA-approved uses depend on the specific drug. Common side effects are mostly gastrointestinal, including nausea, vomiting, diarrhea, constipation, and stomach pain. GLP-1 drugs, as well as similar drugs known as dual GIP/GLP-1 receptor agonists, are available in both injectable and oral formulations and include drugs such as:

  • Ozempic, Wegovy (semaglutide injectable)
  • Rybelsus (semaglutide oral)
  • Mounjaro, Zepbound (tirzepatide injectable)

3. Thiazolidinediones

Also known as glitazones, thiazolidinediones are oral insulin-sensitizing drugs used to treat Type 2 diabetes mellitus. They lower blood sugar with little chance of hypoglycemia (low blood sugar) and may have advantages against atherosclerosis. Thiazolidinediones may also be used to treat polycystic ovarian syndrome due to their potential to enhance ovulation, lower insulin resistance, and enhance endothelial function. Commonly prescribed thiazolidinediones include:

RELATED: Thiazolidinediones: Uses, common brands, and safety info

4. Dipeptidyl peptidase-4 (DPP-4) inhibitors

Used alongside diet and exercise, DPP-4 inhibitors help lower blood sugar by increasing the body’s insulin response after meals. Also called gliptins, these medications may be prescribed for people with Type 2 diabetes when additional blood sugar control is needed, including when metformin alone is not providing adequate results.

DPP-4 inhibitors include:

5. Sulfonylureas

 Sulfonylureas are an older class of medications used to treat Type 2 diabetes. They work primarily by stimulating the pancreas to release more insulin, which can help lower blood glucose levels.

Possible side effects include low blood sugar (hypoglycemia), weight gain, dizziness, headache, nausea, and diarrhea.

Examples of sulfonylureas include:

What’s next when metformin isn’t enough for Type 2 diabetes?

Metformin is often used as a first-line treatment for Type 2 diabetes because it can effectively lower blood sugar and is generally affordable. If it is not providing the desired results, talk with your healthcare provider. They may recommend adding another medication or using a combination treatment to improve blood sugar control.

If medication costs are a concern, a SingleCare discount card may provide additional savings at participating pharmacies.

Do not stop taking metformin without first consulting a healthcare professional. Stopping it suddenly can cause blood sugar levels to rise. An abrupt discontinuation may be appropriate in an emergency, such as a severe allergic reaction, but otherwise your provider should guide any changes to your treatment.

RELATED: How much is metformin without insurance?

When to switch from metformin to insuli

Many people with Type 2 diabetes eventually need insulin, either on its own or alongside oral medications or non-insulin injectable treatments such as Ozempic. Insulin may be considered when other treatments are not sufficient to keep blood glucose within the recommended range.

Healthcare providers may recommend starting insulin when there is persistent or long-term high blood sugar, because insulin can lower glucose effectively and relatively quickly. It may also be considered when blood sugar targets cannot be reached after diagnosis because diabetes has progressed, current treatments are no longer adequately controlling glucose, or diabetes-related complications have developed.

The decision to start insulin depends on a person’s blood sugar levels, overall health, treatment response, and individual medical needs, and should be made with a healthcare provider.

What are the steps you should take if metformin stops working?

If metformin is no longer keeping your blood sugar within the desired range, your diabetes care team may need to reassess your treatment plan, including your medications, diet, physical activity, and other lifestyle factors.

If you are concerned that metformin is no longer working effectively, talk with your healthcare provider first. They can review your blood sugar results, evaluate possible causes, and determine whether an adjustment or alternative treatment may be appropriate.

How to take metformin to maximize benefits

Lifestyle changes, including regular exercise and a healthy diet, can support better diabetes management and cardiovascular health while taking metformin. These habits may also help maximize the benefits of metformin and improve overall blood sugar control.

The DASH (Dietary Approaches to Stop Hypertension) eating plan is a balanced, sustainable approach that may benefit several health conditions, including high blood pressure, high cholesterol, insulin resistance, and obesity.

When taking metformin, choosing nutrient-dense foods can also support blood sugar management. Good options include non-starchy vegetables, such as asparagus, broccoli, cauliflower, leafy greens, salad greens, squash, and green beans. Choosing lean meats and plant-based proteins while limiting saturated fat can also support overall health. Limiting sugary drinks and highly processed, carbohydrate-rich foods such as cookies and chips may help reduce blood sugar spikes after meals.

Metformin may also be associated with vitamin B12 deficiency. A healthcare provider may recommend periodic B12 testing, particularly for people taking metformin long term or who have other risk factors for deficiency.

Regular physical activity can help muscle cells take in and use glucose, supporting better blood sugar control. Aim for about 30 minutes of moderate activity five days a week, or follow the exercise plan recommended by your healthcare provider. If longer workouts are difficult, a 10-minute walk three times a day can be one practical way to build activity into your routine.

Source: SingleCare

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