Mirena 52 mg

 
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About Mirena

What Mirena is used for

  • to prevent pregnancy

What Mirena does

MIRENA is an intrauterine system. Levonorgestrel is a hormone commonly used in combination oral contraceptives (the “Pill”) and is similar to progesterone, a sex hormone produced naturally by the body.

MIRENA works by slowly releasing levonorgestrel into the uterus at a rate of approximately 20 micrograms per day. This small amount of levonorgestrel prevents pregnancy by:

  • reducing the normal monthly thickening of the lining of the uterus.

  • thickening the cervical mucus which prevents passage of sperm through the cervical canal (opening to the uterus).

MIRENA contains a total of 52 mg of levonorgestrel which is enough hormone to prevent pregnancy for five years.

For preventing pregnancy, MIRENA is as effective as oral contraceptives. Clinical trials found that there were about 2 pregnancies per year for every 1000 women using MIRENA.

Other Ways to Prevent Pregnancy

Other methods of birth control are available to you. When used properly, other methods of birth control are effective enough for many women.

The following table gives reported pregnancy rates for various forms of birth control, including no birth control. The reported rates represent the number of women out of 100 who would become pregnant in one year.

Reported Pregnancies per 100 Women per Year
Combination pill less than 1 to 2
Intrauterine device (IUD) less than 1 to 6
Condom with spermicidal foam or gel 1 to 6
Mini-pill 3 to 6
Condom 2 to 12
Diaphragm with spermicidal foam or gel 3 to 18
Spermicide 3 to 21
Sponge with spermicide 3 to 28
Cervical cap with spermicide 5 to 18
Periodic abstinence (rhythm), all types 2 to 20
No birth control 60 to 85

Pregnancy rates vary widely because people differ in how carefully and regularly they use each method. (This does not apply to IUDs since they are implanted in the uterus). Regular users may achieve pregnancy rates in the lower ranges. Others may expect pregnancy rates more in the middle ranges.

The effective use of birth control methods other than birth control pills and IUDs/IUSs requires more effort. It is an effort that many couples undertake successfully.

When Mirena should not be used

MIRENA is not suitable for every woman. In a small number of women, serious side effects may occur. Your doctor can advise you if you have any conditions that would pose a risk to you. The use of MIRENA should always be supervised by your doctor. You should not use MIRENA if you:

  • have any allergies to the hormone levonorgestrel, or to any of the other ingredients of MIRENA, or to components of the container (see the sections in this leaflet titled “What the medicinal ingredient is:” and “What the important nonmedicinal ingredients are:”)

  • are pregnant, or if you suspect that you may be pregnant

  • currently have pelvic inflammatory disease (PID) or have had recurrent PID (see the paragraph in this leaflet titled “Infections”)

  • have an infection of your lower genital tract

  • had an infection of the uterus (womb) after delivering a baby

  • have bleeding from the vagina that has not been explained

  • have a condition of the uterus that distorts the uterine cavity, such as large fibroids

  • have an infection of the cervix (neck of the womb)

  • have cell abnormalities in the cervix (your doctor can tell you if you have this)

  • have a known or suspected progestogen-dependent tumour, including breast cancer

  • have liver disease or liver tumour

  • have had an infection of the uterus (womb) after having an abortion during the past 3 months

  • have bacterial endocarditis (an infection of the heart valves or lining of the heart)

  • have immunodeficiency (a doctor will have told you if you have this)

  • have cancer affecting the blood, or if you have leukaemia

  • have or have had trophoblastic disease (a doctor will have told you if you have this)

  • have cancer of the uterus or the cervix (uterine or cervical malignancy)

What the medicinal ingredient is

Levonorgestrel.

What the important nonmedicinal ingredients for Mirena are

Barium sulphate, black iron oxide, polydimethysiloxane, polyethylene, silica.

What dosage forms Mirena comes in

Each MIRENA (levonorgestrel-releasing intrauterine system) contains 52 mg of levonorgestrel to deliver up to 20 µg levonorgestrel per day for 5 years, and is packaged in a pouch within an insertion device.


Warnings and Precautions

Serious Warnings and Precautions

MIRENA DOES NOT PROTECT against Sexually Transmitted Infections (STIs), including HIV/AIDS. For protection against STIs, it is advisable to use latex or polyurethane condoms while using MIRENA.

Cigarette smoking increases the risk of serious adverse effects on the heart and blood vessels. Women should be counseled not to smoke.

BEFORE you use MIRENA, talk to your doctor or pharmacist if you:

  • are breast-feeding

  • have ever had an ectopic pregnancy (development of a fertilized egg outside the uterus). Ectopic pregnancy is more likely if you accidentally become pregnant while using MIRENA

  • have had surgery on your Fallopian tubes

  • have a history of ovarian cysts. There is an increased risk of cysts on the ovary

  • have an unusual menstrual bleeding pattern

  • have an unusual or unpleasant (e.g. smelly) vaginal discharge or vaginal itching

  • have had a stroke, heart attack or any heart problems

  • have or have had jaundice (a yellowing of the skin, whites of the eyes and/or nails)

  • are diabetic or have a family history of diabetes, have high blood pressure or abnormal blood lipid levels

  • have a history of blood clots (thrombosis)

  • are taking any other medication

  • have a history of migraine, dizziness or blurred vision

  • have severe headaches

  • have a history of depression

  • wear contact lenses

  • have an abnormality of your heart or if you have any problem with your heart valves

  • smoke

You should also inform your doctor about a family history of blood clots, heart attacks, or strokes.

MIRENA is not the method of first choice for young women who have never been pregnant. MIRENA is intended for use only in women of child-bearing age.

Women who had never given birth to a child or were less than 18 years of age were not included in controlled trials using MIRENA.

If you see a different doctor, inform him or her that you are using MIRENA.

Tell your doctor if you are scheduled for any laboratory tests, since certain tests may be affected by hormonal contraceptives. Also tell your doctor if you are scheduled for surgery requiring prolonged bed rest.

MIRENA should be used only under the supervision of a doctor, with regular follow-up to identify side effects associated with its use. Your visits may include a blood pressure check, a breast exam, an abdominal exam and a pelvic exam, including a Pap smear. Visit your doctor 4 to 12 weeks after the initial examination. Afterward, visit your doctor at least once a year. Use MIRENA only on the advice of your doctor and carefully follow all directions given to you. Otherwise, you may become pregnant.

If you and your doctor decide that, for you, the benefits of MIRENA outweigh the risks, you should be aware of the following:

The Risks of Using MIRENA:

  1. Circulatory Disorder (including blood clot in legs, lungs, heart, eyes, or brain)

    Some studies have suggested that women who use progestogen-only oral contraceptives might have a slightly higher risk of blood clots, however, the results are not certain. You should discuss risk factors for blood clots with your doctor.

    Be alert for the following symptoms and signs of serious adverse effects. Call your doctor immediately if they occur:

    • Sharp pain in the chest, coughing blood, or sudden shortness of breath. These symptoms could indicate a possible blood clot in the lung.

    • Pain and/or swelling in the calf. These symptoms could indicate a possible blood clot in the leg.

    • Crushing chest pain or heaviness. These symptoms could indicate a possible heart attack.

    • Sudden severe or worsening headache or vomiting, dizziness or fainting, disturbances of vision or speech, or weakness or numbness in an arm or leg. These symptoms could indicate a possible stroke.

    • Sudden partial or complete loss of vision. This symptom could indicate a blood clot in the eye.

      Any of these conditions can cause death or disability. Clots also occur rarely in the blood vessels of the eye, resulting in blindness or impaired vision or in a blood vessel leading to an arm or leg, resulting in damage to or loss of a limb.

  2. Breast Cancer

    The most significant risk factors for breast cancer are increasing age and a strong history of breast cancer in the family (mother or sister). Other established risk factors include onset of menstrual periods before age 12 years, never having children, having your first full-term pregnancy after the age of 30 years, never having breast fed a child, and daily alcohol consumption.

    Some studies have shown that the risk of developing breast cancer does not appear to be increased by using progestogen-only forms of birth control like MIRENA. However, more thorough studies are needed to confirm that there is no increased risk. You should notify your doctor if you notice any breast lumps. You should also discuss breast self-examination with your doctor. A yearly breast examination by a health care professional is recommended for all women.

  3. Diabetes

    In diabetic users of MIRENA, the blood glucose concentration should be closely monitored.

  4. Infections

    There is an increased risk of a serious pelvic infection called pelvic inflammatory disease (PID) in the first three weeks after insertion of an intrauterine system or device. Other known risk factors include multiple sexual partners, frequent intercourse, and young age. PID can cause serious problems such as infertility, ectopic pregnancy, or constant pelvic pain. PID is usually treated with antibiotics; however, more serious cases of PID may require surgery. Tell your doctor right away if you have any of these signs of PID: long-lasting or heavy bleeding, unusual vaginal discharge, low abdominal (stomach area) pain, painful sex, chills or fever.

  5. Ectopic Pregnancy

    Ectopic pregnancy (development of a fertilized egg outside the uterus) is possible when using MIRENA, as it is in women using no contraception. However, if you accidentally become pregnant while using MIRENA, an ectopic pregnancy is more likely. Ectopic pregnancy is a serious condition. Therefore, you should tell your doctor if you have lower abdominal pain, especially if you have missed a period and/or have unexpected bleeding, since these can be signs of an ectopic pregnancy.

  6. Cysts on the Ovary

    Cysts on the ovary commonly occur in women using MIRENA. These cysts usually disappear on their own within a few months. However, cysts can sometimes cause pain and may need medical attention.

  7. Uterine Perforations

    In rare cases (occurring at a rate of between 1/1000 and 1/10 000), and most often during insertion, MIRENA may penetrate or perforate (punch a hole in) the wall of the uterus. If this happens, the system must be removed.

  8. Use While Breast-Feeding

    Hormonal contraceptives are not recommended as a birth control method of first choice in women who are breast-feeding. Small quantities of levonorgestrel, the medicinal ingredient in MIRENA, have been found in the milk of breast-feeding women using MIRENA; however, there does not appear to be a detrimental effect on growth or development of breast-fed infants whose mothers started using the product six weeks after delivery.

  9. Use in Pregnancy

    If you become pregnant with MIRENA in place, you should have it removed as soon as possible. If it is left in place during pregnancy, the chances of having a miscarriage or premature delivery increase. The effect of levonorgestrel on a developing infant is not well known, and therefore a detrimental effect cannot be completely ruled out. You should check with your doctor about risks to your unborn child.

  10. Use After Pregnancy

    Following childbirth, MIRENA should be inserted only after the womb has returned to its normal size, and not earlier than 6 weeks after delivery.

  11. Pregnancy After Stopping MIRENA

    If you wish to become pregnant, ask your doctor to remove MIRENA. Your usual level of fertility should return soon after the system is removed. Nearly 90% of women wishing to become pregnant conceive within 24 months after removal of the system.

Driving or Using Machines

The effect of MIRENA on the ability to drive or to use machines has not been studied. Do not drive or use machines until you know how you react to MIRENA.

How Will MIRENA Affect My Periods?

MIRENA will affect your menstrual cycle. You might experience frequent spotting (a small amount of blood loss) or light bleeding in addition to your periods for the first 3 to 6 months. In some cases, you may have heavy or prolonged bleeding during this time.

Overall, you are likely to have a gradual reduction in the number of bleeding days and in the amount of blood loss each month. Some women using MIRENA eventually find that their periods stop altogether.

When the system is removed, periods should return to normal.

What if I Stop Having Periods?

Gradually, over time, your menstrual period may disappear when using MIRENA. This is because of the effect of the hormone on the lining of the uterus. The normal monthly thickening of the uterine lining with blood does not happen, therefore there is little or no bleeding, as happens during a usual menstrual period. It does not necessarily mean you have reached menopause or are pregnant.

If, however, you are having regular menstrual periods and then do not have one for 6 weeks or longer, it is possible that you may be pregnant. You should speak to your doctor.


Interactions with Mirena

Please inform your doctor or pharmacist if you are taking or have recently taken any other drugs or herbal products, even those without a prescription.

Hormonal contraceptives may become less reliable if you are also taking drugs that affect the liver (such as primidone, barbiturates, phenytoin, carbamazepine, rifampicin and griseofulvin) at the same time. The influence of these drugs on the reliability of MIRENA has not been studied, but is unlikely since MIRENA releases a very small amount of hormone, and delivers the hormone inside the uterus.

The T-frame of MIRENA contains barium sulphate, which makes it visible in X-ray examinations.


Proper Use of Mirena

Usual dose

What Mirena Looks Like (see package insert for illustrations)

MIRENA consists of a small white T-shaped frame made from soft, flexible plastic. The vertical and horizontal arms of the T are approximately 3 cm in length. The vertical arm is surrounded by a narrow cylindrical shaped reservoir that contains levonorgestrel. Two fine plastic threads are attached to the tip of the vertical arm. These threads are intended to be used for removal of the system and also serve to check its presence once it is in place.

How is MIRENA inserted?

Before MIRENA is inserted, you will have a pelvic examination to determine the position and size of your uterus. Your doctor will insert the thin flexible plastic tube of the insertion device containing MIRENA into your uterus. At this point you may feel a little discomfort.

Once MIRENA is in the correct position, your doctor will withdraw the tube leaving the system in place in the uterus. Finally, your doctor will trim the removal threads to a suitable length.

After insertion you may feel some cramp-like menstrual pain; however, this usually disappears within a few days.

Most women find that the insertion procedure causes minor discomfort, however, for some it may be more uncomfortable. If concerned, you may wish to discuss the need for a painkiller or local anesthetic with your doctor. Some women may feel faint after the system is inserted, but this feeling subsides after a short rest. The insertion procedure may precipitate a seizure in epileptic patients.

It is uncommon but, part or all of the system may penetrate the wall of the uterus during insertion and come to rest outside the uterus. If this happens the system must be removed.

When Should MIRENA Be Inserted?

The system should be inserted during your period or within seven days of it starting. When replacing an existing system for a new one, it is not necessary to wait for your period.

How Long Does Insertion Take?

The insertion procedure usually takes a few minutes after your doctor has completed the pelvic examination.

Technical Information