Store at 25°C (77°F); excursions permitted to 15° to 30°C (59° to 86°F) [see USP Controlled Room Temperature]. Keep tightly closed (protect from moisture). Protect from light. Avoid excessive heat and humidity.
Mfg. Rev. 02/16
PATIENT INFORMATION ABOUT
Metformin Hydrochloride Extended-release Tablets
(met-FOR-min HYE-droe-KLOR-ide)
Q1. Why do I need to take metformin hydrochloride extended-release tablets?
Your doctor has prescribed metformin hydrochloride extended-release tablets to treat your type 2 diabetes, a condition in which blood sugar (blood glucose) is elevated. There are two types of diabetes. Metformin hydrochloride extended-release tablets are indicated for the most common type, known as type 2 diabetes.
Q2. Why is it important to control type 2 diabetes?
Type 2 diabetes has multiple possible complications, including blindness, kidney failure, and circulatory and heart problems. Lowering your blood sugar to a normal level may prevent or delay these complications.
Q3. How is type 2 diabetes usually controlled?
High blood sugar can be lowered by diet and exercise, by a number of oral medications and by insulin injections. Your doctor may recommend that you try lifestyle modifications such as improved diet and exercise before initiating drug treatment for type 2 diabetes. Each patient will be treated individually by his or her physician, and should follow all treatment recommendations.
Q4. Do metformin hydrochloride extended-release tablets work differently from other glucose control medications?
Yes. Metformin hydrochloride extended-release tablets, as well as other formulations of metformin, lowers the amount of sugar in your blood by controlling how much sugar is released by the liver. Metformin hydrochloride extended-release tablets do not cause your body to produce more insulin. Metformin hydrochloride extended-release tablets rarely causes hypoglycemia (low blood sugar) and it does not usually cause weight gain when taken alone. However, if you do not eat enough, if you take other medications to lower blood sugar, or if you drink alcohol, you can develop hypoglycemia. Specifically, when metformin hydrochloride extended-release tablets is taken together with a sulfonylurea or with insulin, hypoglycemia and weight gain are more likely to occur.
Q5. What happens if my blood sugar is still too high?
If your blood sugar is high, consult your physician. When blood sugar cannot be lowered enough by either metformin hydrochloride extended-release tablets or a sulfonylurea, the two medications can be effective when taken together. Other alternatives involve switching to other oral antidiabetic drugs (e.g., alpha glucoside inhibitors or glitazones). Metformin hydrochloride extended-release tablets may be stopped and replaced with other drugs and/or insulin. If you are unable to maintain your blood sugar with diet, exercise and glucose-control medications taken orally, then your doctor may prescribe injectable insulin to control your diabetes.
Q6. Why should I take metformin hydrochloride extended-release release tablets in addition to insulin if I am already on insulin alone?
Adding metformin hydrochloride extended-release tablets to insulin can help you better control your blood sugar while reducing the insulin dose and possibly reducing your weight.
Q7. Can metformin hydrochloride extended-release tablets cause side effects?
Metformin hydrochloride extended-release tablets, like all blood sugar-lowering medications, can cause side effects in some patients. Most of these side effects are minor and will go away after you've taken metformin hydrochloride extended-release tablets for a while. However, there are also serious but rare side effects related to metformin hydrochloride extended-release tablets (see below).
Q8. What kind of side effects can metformin hydrochloride extended-release tablets cause?
If side effects occur, they usually occur during the first few weeks of therapy. They are normally minor ones such as diarrhea, nausea, abdominal pain and upset stomach. Metformin hydrochloride extended-release tablets are generally taken with meals, which reduce these side effects.
Although these side effects are likely to go away, call your doctor if you have severe discomfort or if these effects last for more than a few weeks. Some patients may need to have their doses lowered or stop taking metformin hydrochloride extended-release tablets, either temporarily or permanently. You should tell your doctor if the problems come back or start later on during the therapy.
WARNING: A rare number of people who have taken metformin have developed a serious condition called lactic acidosis. Properly functioning kidneys are needed to help prevent lactic acidosis. You should not take metformin hydrochloride extended-release tablets if you have impaired kidney function, as measured by a blood test (see Q9-13).
Q9. Are there any serious side effects that metformin hydrochloride extended-release tablets can cause?
Metformin hydrochloride extended-release tablets rarely cause serious side effects. The most serious side effect that metformin hydrochloride extended-release tablets can cause is called lactic acidosis.
Q10. What is lactic acidosis and can it happen to me?
Lactic acidosis is caused by a build-up of lactic acid in the blood. Lactic acidosis associated with metformin is rare and has occurred mostly in people whose kidneys were not working normally. Lactic acidosis has been reported in about one in 33,000 patients taking metformin over the course of a year. Although rare, if lactic acidosis does occur, it can be fatal in up to half the cases.
It is also important for your liver to be working normally when you take metformin hydrochloride extended-release tablets. Your liver helps to remove lactic acid from your bloodstream. Your doctor will monitor your diabetes and may perform blood tests on you from time to time to make sure your kidneys and your liver are functioning normally. There is no evidence that metformin hydrochloride extended-release tablets causes harm to the kidneys or liver.
Q11. Are there other risk factors for lactic acidosis?
Your risk of developing lactic acidosis from taking metformin hydrochloride extended-release tablets is very low as long as your kidneys and liver are healthy. However, some factors can increase your risk because they can affect kidney and liver function. You should discuss your risk with your physician. You should not take metformin hydrochloride extended-release tablets if:
- You have some forms of kidney or liver problems
- You have congestive heart failure which is treated with medications, e.g., digoxin (Lanoxin ®) or furosemide (Lasix ®)
- You drink alcohol excessively (all the time or short-term "binge" drinking)
- You are seriously dehydrated (have lost a large amount of body fluids)
- You are going to have, within a few days, certain x-ray tests with injectable contrast agents
- You are going to have surgery
- You develop a serious condition such as a heart attack, severe infection, or a stroke
- You are 80 years of age or older and have NOT had your kidney function tested
Q12. What are the symptoms of lactic acidosis?
Some of the symptoms include feeling very weak, tired or uncomfortable, unusual muscle pain, trouble breathing, unusual or unexpected stomach discomfort, feeling cold, feeling dizzy or lightheaded, or suddenly developing a slow or irregular heartbeat. If you notice these symptoms, or if your medical condition has suddenly changed, stop taking metformin hydrochloride extended-release tablets and call your doctor right away. Lactic acidosis is a medical emergency that must be treated in a hospital.
Q13. What does my doctor need to know to decrease my risk of lactic acidosis?
Tell your doctor if you have an illness that results in severe vomiting, diarrhea and/or fever, or if your intake of fluids is generally reduced. These situations can lead to severe dehydration, and it may be necessary to stop taking metformin hydrochloride extended-release tablets temporarily. You should let your doctor know if you are going to have any surgery or specialized x-ray procedures that require injection of contrast agents. Metformin hydrochloride extended-release tablets therapy will need to be stopped temporarily in such instances.
Q14. Can I take metformin hydrochloride extended-release tablets with other medications?
Remind your doctor and/or pharmacist that you are taking metformin hydrochloride extended-release tablets when any new drug is prescribed or a change is made in how you take a drug already prescribed. Metformin hydrochloride extended-release tablets may interfere with the way some drugs work and some drugs may interfere with the action of metformin hydrochloride extended-release tablets.
Q15. What if I become pregnant while taking metformin hydrochloride extended-release tablets?
Tell your doctor if you plan to become pregnant or have become pregnant. As with other oral glucose-control medications, you should not take metformin hydrochloride extended-release tablets during pregnancy. Usually your doctor will prescribe insulin while you are pregnant.
Q16. How do I take metformin hydrochloride extended-release tablets?
Metformin hydrochloride extended-release tablets should not be cut, crushed, or chewed and should be taken whole with a full glass of water once daily with the evening meal. Occasionally, the inactive ingredients of metformin hydrochloride extended-release tablets may be eliminated as a soft mass in your stool that may look like the original tablet; this is not harmful and will not effect the way metformin hydrochloride extended-release tablets works to control diabetes. Metformin hydrochloride extended-release tablets should be taken once a day with food. You will be started on a low dose of metformin hydrochloride extended-release tablets and your dosage will be increased gradually until your blood sugar is controlled.
Q17. Where can I get more information about metformin hydrochloride extended-release tablets?
This leaflet is a summary of the most important information about metformin hydrochloride extended-release tablets. If you have any questions or problems, you should talk to your doctor or other healthcare provider about type 2 diabetes as well as metformin hydrochloride extended-release tablets and its side effects.
Manufactured for:
Manufactured for:
AvKARE, Inc.
Pulaski, TN 38478
Mfg. Rev. 02/16
AV 01/17 (P)