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- What is metformin? How does it work (mechanism of action)?
- What are the uses for metformin?
- What are the side effects of metformin?
- What is the dosage for metformin?
- Which drugs or supplements interact with metformin?
- Is metformin safe to take if I'm pregnant or breastfeeding?
- What else should I know about metformin?
What is metformin? How does it work (mechanism of action)?
Metformin is an oral medication that lowers blood glucose (sugar) by influencing the body's sensitivity to insulin and is used for treating type 2 diabetes. Insulin is a hormone produced by the pancreas that controls glucose levels in blood by reducing the amount of glucose made by the liver and by increasing the removal of glucose from the blood by muscle and fat tissues. As a result, insulin causes blood glucose levels fall. Diabetes caused by a decrease in production of insulin that causes increased production of glucose by the liver, and reduced uptake (and effects) of insulin on fat and muscle tissues. Metformin acts by increasing the sensitivity of liver, muscle, fat, and other tissues to the uptake and effects of insulin. These actions lower the level of sugar in the blood.
Unlike glucose-lowering drugs of the sulfonylurea class, for example glyburide (Micronase, DiaBeta) or glipizide (Glucotrol), metformin does not increase the concentration of insulin in the blood and, therefore, does not cause excessively low blood glucose levels (hypoglycemia) when used alone. In scientific studies, metformin reduced the complications of diabetes such as heart disease, blindness, and kidney disease
The FDA aproved metformin in December 1994.
What are the uses for metformin?
- Metformin is used for treating type 2 diabetes in adults and children. It may be used alone or in combination with other diabetic medications.
- Metformin also has been used to prevent the development of diabetes in people who are at risk.
- Treatment of polycystic ovaries
- Weight gain due to medications used for treating psychoses.
Quick GuideDiabetes Diet: Healthy Meal Plans for Diabetes-Friendly Eating
What are the side effects of metformin?
The most common side effects with metformin are
These symptoms occur in one out of every three patients. These side effects may be severe enough to cause therapy to be discontinued in one out of every 20 patients. These side effects are related to the dose of the medication and may decrease if the dose is reduced.
Metformin may also cause:
- weakness or lack of energy
- respiratory tract infections,
- low levels of vitamin B-12,
- low blood glucose (hyperglycemia)
- indigestion, muscle pain,
- heartburn, and
A serious but rare side effect of metformin is lactic acidosis. Lactic acidosis occurs in one out of every 30,000 patients and is fatal in 50% of cases. The symptoms of lactic acidosis are
- trouble breathing,
- abnormal heartbeats,
- unusual muscle pain,
- stomach discomfort,
- light-headedness, and
- feeling cold.
Patients at risk for lactic acidosis include those with reduced function of the
What is the dosage for metformin?
- For treating type 2 diabetes in adults, metformin (immediate release) usually is begun at a dose of 500 mg twice a day or 850 mg once daily. The dose is gradually increased by 500 mg weekly or 850 mg every two weeks as tolerated and based on the response of the levels of glucose in the blood. The maximum daily dose is 2550 mg given in three divided doses.
- If extended tablets are used, the starting dose is 500 mg or 1000 mg daily with the evening meal. The dose can be increased by 500 mg weekly up to a maximum dose of 2000 mg except for Fortamet (2500 mg of Fortamet, once daily or in two divided doses). Glumetza tablets (500 -1000mg formulations are given once daily (either 1000 to 2000mg). Fortamet and Glumetza are modified release formulations of metformin. Metformin should be taken with meals.
- For pediatric patients 10-16 years of age, the starting dose is 500 mg twice a day. The dose can be increased by 500 mg weekly up to a maximum dose of 2000 mg in divided doses.
- Children older than 17 years of age may receive 500 mg of extended release tablets daily up to a maximum dose of 2000 mg daily. Extended release tablets are not approved for children younger than 17 years of age.
- Metformin-containing drugs may be safely used in patients with mild to moderate renal impairment. Renal function should be assessed before starting treatment and at least yearly.
- Metformin should not be used by patients with an estimated glomerular filtration rate (eGFR) below 30 mL/minute/1.73 m2 and starting metformin in patients with an eGFR between 30-45 mL/minute/1.73 m2 is not recommended.
- Metformin should be stopped at the time of or before administering iodinated contrast in patients with an eGFR between 30 and 60 mL/minute/1.73 m2; in patients with a history of liver disease, alcoholism, or heart failure; or in patients who will be administered intra-arterial iodinated contrast. Kidney function should be evaluated 48 hours after receiving contrast and metformin may be restarted if kidney function is stable.
Which drugs or supplements interact with metformin?
- Cimetidine (Tagamet), by decreasing the elimination of metformin from the body, can increase the amount of metformin in the blood by 40%. This may increase the frequency of side effects from metformin.
- Ioversol (Optiray) and other iodinated contrast media may reduce kidney function, which reduces elimination of metformin, leading to increased concentrations of metformin in the blood. Metformin should be stopped 48 hours before and after use of contrast media.
- Thiazide diuretics, steroids, estrogens, and oral contraceptives may increase blood glucose and reduce the effect of metformin. When these drugs are stopped, patients should be closely observed for signs of low blood glucose.
- Alcohol consumption increases the effect of metformin on lactate production, increasing the risk of lactic acidosis.
Is metformin safe to take if I'm pregnant or breastfeeding?
What else should I know about metformin?
- Metformin is available as
- Tablets: 500, 850, and 1000 mg
- Tablets (extended release): 500, 750, and 1000 mg.
- Solution: 100 mg/ ml
- Metformin should be stored at room temperature between 20 C to 25 C (68 F to 77 F).
- Metormin is available in generic versions of immediate release and extended release formulations.
- You need a prescription from your doctor to obtain metformin.
- Brand names available for metformin in the US include:
- Glucophage XR
Metformin (Glucophage, Glucophage XR, Glumetza, Fortamet, Riomet) is a medication prescribed to treat type 2 diabetes and the prevention of type 2 diabetes in patients who are at risk for type 2 diabetes. Side effects of metformin include loss of appetite, bloating, heartburn, gas, nausea, and vomiting.
Drug interactions, dosage, and pregnancy and breastfeeding safety information should be reviewed prior to taking this medication.
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Diabetes MellitusDiabetes is a chronic condition characterized by high levels of sugar (glucose) in the blood. The two types of diabetes are referred to as type 1 (insulin dependent) and type 2 (non-insulin dependent). Symptoms of diabetes include increased urine output, thirst, hunger, and fatigue. Treatment of diabetes depends on the type.
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Diabetes TreatmentThe major goal in treating diabetes is controlling elevated blood sugar without causing abnormally low levels of blood sugar. Type 1 diabetes is treated with:
- and a diabetic diet.
- weight reduction,
- a diabetic diet,
- and exercise.
Diabetic Diet for Type 2 Diabetes
A type 2 diabetes diet or a type 2 diabetic diet is important for blood sugar (glucose) control in people with diabetes to prevent complications of diabetes. There are a variety of type 2 diabetes diet eating plans such as the Mediterranean diet, Paleo diet, ADA Diabetes Diet, and vegetarian diets.Learn about low and high glycemic index foods, what foods to eat, and what foods to avoid if you have type 2 diabetes.
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Hyperglycemia or high blood sugar is a serious health problem for diabetics. There are two types of hyperglycemia, 1) fasting, and 2)postprandial or after meal hyperglycemia. Hyperglycemia can also lead to ketoacidosis or hyperglycemic hyperosmolar nonketotic syndrome (HHNS). There are a variety of causes of hyperglycemia in people with diabetes. Symptoms of high blood sugar may include increased thirst, headaches, blurred vision, and frequent urination.Treatment can be achieved through lifestyle changes or medications changes. Carefully monitoring blood glucose levels is key to prevention.
Low blood sugar, or hypoglycemia, is a syndrome in which a person's blood sugar is dangerously low. People with type 1 and type 2 diabetes are at risk for this condition. There are other diseases that can cause a person's blood sugar levels to go too low, for example, pancreatitis, Cushing's syndrome, and pancreatic cancer. Symptoms and signs that your blood sugar levels are too low include:
- Intense hunger
If your blood sugars become too have the following nearby as a quick treatment.
- Table sugar
- Glucose tablets
Insulin resistance is the diminished ability of cells to respond to the action of insulin in transporting glucose (sugar) from the bloodstream into muscle and other tissues. There are no signs or symptoms of insulin resistance. Causes of insulin can include conditions such as stress, obesity, metabolic syndrome, and steroid use.
Some of the risk factors for insulin resistance include fatty liver, heart disease, strokes, peripheral vascular disease, high cholesterol, and smoking. Treatment for insulin resistance are lifestyle changes and if necessary, medication.
Metabolic SyndromeThe main features of metabolic syndrome include insulin resistance, hypertension (high blood pressure), cholesterol abnormalities, and an increased risk for clotting. Patients are most often overweight or obese. Lifestyle modification such as the Mediterranean diet, exercise, and quitting smoking are the preferred treatment of metabolic syndrome.
Metabolic SyndromeMetabolic syndrome is serious and you should be concerned. Learn the causes, symptoms, treatments, and complications of metabolic syndrome with our quick quiz.
Prediabetes is a situation where a person's blood sugar levels are higher than they should be, but aren't high enough to be diagnosed with type 2 diabetes. There are no signs or symptoms of prediabetes. Some of the risk factors for prediabetes are
- high blood pressure,
- high cholesterol,
- heart disease,
- family history,
- poor diet, and
- lack of activity.
Diet changes along with other healthy lifestyle changes are important in treating prediabetes.
Type 1 vs Type 2 Diabetes Similarities Differences
Diabetes mellitus is a metabolic condition in which a person's blood sugar (glucose) levels are too high. Over 29.1 million children and adults in the US have diabetes. Of that, 8.1 million people have diabetes and don't even know it. Type 1 diabetes (insulin-dependent, juvenile) is caused by a problem with insulin production by the pancreas. Type 2 diabetes (non-insulin dependent) is caused by:
Eating a lot of foods and drinking beverages with simple carbohydrates (pizza, white breads, pastas, cereals, pastries, etc.) and simple sugars (donuts, candy, etc.)
- Consuming too many products with artificial sweeteners (We found out that they are bad for us!)
- Lack of activity
While the signs and symptoms of both types of diabetes are the same, which include:
- Increased urination
- Increased hunger
- Increased thirst
- Unexplained weight loss.
However, the treatments are different. Type 1 diabetes is insulin dependent, which means a person with this type of diabetes requires treatment with insulin. People with type 2 diabetes require medication, lifestyle changes like eating a healthy diet, and getting regular exercise.
Type 2 Diabetes
Type 2 diabetes is a condition in which a person's pancreas does not produce enough insulin to meet the needs of the body. Causes of type 2 diabetes are a sedentary lifestyle, eating excess sugar and carbohydrates, lack of exercise, being overweight, and genetics. Symptoms of type 2 diabetes are often subtle, but may include fatigue, urine odor, unintentional
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