Description and Brand Names

Drug information provided by: IBM Micromedex

US Brand Name

  1. Implanon


Etonogestrel implant is used in women to prevent pregnancy. It is a form of birth control that contains a hormone in a flexible plastic rod about the size of a matchstick. It is effective for 3 years when inserted just beneath the skin of your upper arm.

This medicine stops the release of an egg from your ovary. The mucus in your cervix thickens and may prevent sperm from reaching the egg.

Etonogestrel implant will not protect a woman from sexually transmitted diseases (STDs), including human immunodeficiency virus (HIV) or acquired immunodeficiency syndrome (AIDS). The use of latex (rubber) condoms or abstinence (not having sex) is recommended for protection from these diseases.

This medicine is to be given only by or under the direct supervision of a trained healthcare professional.

Before Using

In deciding to use a medicine, the risks of taking the medicine must be weighed against the good it will do. This is a decision you and your doctor will make. For this medicine, the following should be considered:


Tell your doctor if you have ever had any unusual or allergic reaction to this medicine or any other medicines. Also tell your health care professional if you have any other types of allergies, such as to foods, dyes, preservatives, or animals. For non-prescription products, read the label or package ingredients carefully.


Appropriate studies on the relationship of age to the effects of etonogestrel implant have not been performed in the pediatric population. However, pediatric-specific problems that would limit the usefulness of this medication in teenagers are not expected. This medicine may be used for birth control in teenage females but should not be used before the start of menstruation.


Appropriate studies on the relationship of age to the effects of etonogestrel implant have not been performed in the geriatric population. This medicine is not indicated for use in elderly women.


There are no adequate studies in women for determining infant risk when using this medication during breastfeeding. Weigh the potential benefits against the potential risks before taking this medication while breastfeeding.

Drug Interactions

Although certain medicines should not be used together at all, in other cases two different medicines may be used together even if an interaction might occur. In these cases, your doctor may want to change the dose, or other precautions may be necessary. When you are receiving this medicine, it is especially important that your healthcare professional know if you are taking any of the medicines listed below. The following interactions have been selected on the basis of their potential significance and are not necessarily all-inclusive.

Using this medicine with any of the following medicines is not recommended. Your doctor may decide not to treat you with this medication or change some of the other medicines you take.

  • Tranexamic Acid

Using this medicine with any of the following medicines is usually not recommended, but may be required in some cases. If both medicines are prescribed together, your doctor may change the dose or how often you use one or both of the medicines.

  • Amobarbital
  • Apalutamide
  • Aprepitant
  • Aprobarbital
  • Armodafinil
  • Artemether
  • Belzutifan
  • Bexarotene
  • Bosentan
  • Butabarbital
  • Butalbital
  • Carbamazepine
  • Cenobamate
  • Clobazam
  • Dabrafenib
  • Darunavir
  • Dexamethasone
  • Elagolix
  • Elvitegravir
  • Encorafenib
  • Enzalutamide
  • Eslicarbazepine Acetate
  • Eterobarb
  • Etravirine
  • Fosaprepitant
  • Fosphenytoin
  • Griseofulvin
  • Heptabarbital
  • Hexobarbital
  • Isotretinoin
  • Ivosidenib
  • Lesinurad
  • Lixisenatide
  • Lorlatinib
  • Lumacaftor
  • Mavacamten
  • Mephobarbital
  • Methohexital
  • Mitapivat
  • Mitotane
  • Mobocertinib
  • Modafinil
  • Mycophenolic Acid
  • Nafcillin
  • Nevirapine
  • Oxcarbazepine
  • Pentobarbital
  • Phenobarbital
  • Phenylbutazone
  • Phenytoin
  • Pitolisant
  • Prednisone
  • Primidone
  • Red Clover
  • Rifabutin
  • Rifampin
  • Rifapentine
  • Ritonavir
  • Rufinamide
  • Secobarbital
  • St John's Wort
  • Sugammadex
  • Tazemetostat
  • Telaprevir
  • Theophylline
  • Thiopental
  • Topiramate
  • Ulipristal

Using this medicine with any of the following medicines may cause an increased risk of certain side effects, but using both drugs may be the best treatment for you. If both medicines are prescribed together, your doctor may change the dose or how often you use one or both of the medicines.

  • Atazanavir
  • Efavirenz

Other Interactions

Certain medicines should not be used at or around the time of eating food or eating certain types of food since interactions may occur. Using alcohol or tobacco with certain medicines may also cause interactions to occur. The following interactions have been selected on the basis of their potential significance and are not necessarily all-inclusive.

Using this medicine with any of the following may cause an increased risk of certain side effects but may be unavoidable in some cases. If used together, your doctor may change the dose or how often you use this medicine, or give you special instructions about the use of food, alcohol, or tobacco.

  • Caffeine

Other Medical Problems

The presence of other medical problems may affect the use of this medicine. Make sure you tell your doctor if you have any other medical problems, especially:

  • Abnormal or unusual vaginal bleeding (non-menstrual) or
  • Blood clots (eg, deep vein thrombosis, pulmonary embolism), or history of or
  • Heart attack, or history of or
  • Stroke, or history of or
  • Breast cancer, known or suspected, or progestin-sensitive, or history of or
  • Liver disease (active), including tumors—Should not be used in patients with these conditions.
  • Depression, or history of or
  • Diabetes or
  • Fluid retention (body swelling) or
  • Gallbladder disease or
  • Heart disease or
  • Hyperlipidemia (high cholesterol or fats in the blood) or
  • Hypertension (high blood pressure) or
  • Kidney disease—Use with caution. May make these conditions worse.
  • Obesity—This condition may cause the medicine to not work as well.

Proper Use

It is very important that you tell your doctor if you think you might be pregnant or if you missed a period before you receive this medicine. A pregnancy test will be done to make sure you are not pregnant before this medicine is inserted.

This medicine comes with patient instructions. After reading the instructions, you will be asked to sign a USER CARD and a Patient Consent Form before you receive this medicine. The Consent Form tells you about some possible risks when using this medicine, and when it must be removed. Make sure you understand what is in the patient instructions and the Consent Form before you sign it. Keep the USER CARD in a safe place at home with your health records. If you have any questions, ask your doctor.

The implants are usually inserted by your doctor between the first and fifth day of your menstrual period, even if you are still bleeding.

After this medicine is inserted, your doctor should feel your arm to check that the implants are in the right place. You can also check it by gently pressing your fingertips over the insertion site. You should be able to feel the small rod. If you cannot feel the implants in your arm, you will need to use a non-hormonal birth control (such as condoms, spermicide) until your doctor confirms that the implants are in place.

Your doctor will cover the insertion site with 2 bandages. You may remove the top bandage after 24 hours. The smaller bandage may be removed after 3 to 5 days.

Your doctor must remove this medicine after 3 years. If you would like to stop using this medicine, your doctor can remove it at any time. Do not try to remove the implants by yourself.

If you still want to prevent pregnancy after this medicine is removed, you should start using another form of birth control (eg, condoms, diaphragms, or spermicides) right away. If you still want to continue using this medicine, your doctor can insert a new implant under your skin after taking the old one out.

Do not eat grapefruit or drink grapefruit juice while you are using this medicine.


It is very important that your doctor check your progress at regular visits to make sure this medicine is working properly and does not cause unwanted effects.

Tell your doctor if you have recently given birth. You may start using this medicine 4 weeks after giving birth.

Etonogestrel implant will not protect you against HIV/AIDS, herpes, or other sexually transmitted diseases. Tell your doctor if you or your partner begins to have sexual intercourse with other people, or you or your partner tests positive for a sexually transmitted disease. Talk with your doctor if you have any concerns.

Tell your doctor if you had an allergic reaction to numbing medicines (anesthetics) or skin cleansers (antiseptics). These medicines will be used when etonogestrel implant is inserted into your arm.

This medicine may cause several problems related to insertion and removal, such as pain, irritation, swelling, bruising, scarring, or other complications. Talk to your doctor about these possible risks.

You could have less bleeding or may even stop having periods while using this medicine. Call your doctor if you have a change from your regular bleeding pattern after you have had your implants for awhile, such as more bleeding or if you miss a period (and if you were having periods even with your implants).

Call your doctor right away if you think you have become pregnant while you are using this medicine. You may have a higher risk of an ectopic pregnancy (occurs outside the womb) if you get pregnant while your implants are in place. This can be a serious and life-threatening condition. It can also cause problems that may make it harder for you to become pregnant in the future.

Using this medicine may increase your risk of blood clots in the legs (deep vein thrombosis), lungs (pulmonary embolism), brain (stroke), heart (heart attack), or eyes (blindness). Make sure your doctor knows at least 4 weeks before if you are going to have surgery or will need to be on bed rest. There is a higher risk of having these serious medical problems during surgery or bed rest or if you smoke regularly.

This medicine may also increase your risk of having ovarian cysts, breast cancer, gallbladder problems, or liver tumors. Talk to your doctor if you have any concerns.

Check with your doctor right away if you have pain or tenderness in the upper stomach, pale stools, dark urine, loss of appetite, nausea, vomiting, or yellow eyes or skin. These could be symptoms of a serious liver problem.

This medicine may increase your weight. Your doctor may need to check your weight on a regular basis while you are using this medicine. Talk to your doctor about ways to prevent weight gain.

Your blood pressure might get too high while you are using this medicine. This may cause headaches, dizziness, or blurred vision. You might need to measure your blood pressure at home. If you think your blood pressure is too high, call your doctor right away.

This medicine may affect blood sugar levels. If you notice a change in the results of your blood or urine sugar tests, or if you have any questions, check with your doctor.

This medicine may also increase the amount of cholesterol and fats in your blood. If this condition occurs, your doctor may give you some medicines that can lower the amount of cholesterol and fats in the blood.

If you wear contact lenses and you have blurred vision, difficulty in reading, or any other change in vision while using this medicine, check with your doctor right away. Your doctor may want your eyes be checked by an eye doctor (ophthalmologist).

Before you have any medical tests, tell the medical doctor in charge that you are using etonogestrel implant. The results of some tests may be affected by this medicine.

Do not take other medicines unless they have been discussed with your doctor. This includes prescription or nonprescription (over-the-counter [OTC]) medicines and herbal (St. John's wort) or vitamin supplements.

Side Effects

Along with its needed effects, a medicine may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention.

Check with your doctor or nurse immediately if any of the following side effects occur:

More common

  1. Breast pain
  2. chills
  3. cough
  4. diarrhea
  5. fever
  6. general feeling of discomfort or illness
  7. headache
  8. joint pain
  9. loss of appetite
  10. muscle aches and pain
  11. nausea
  12. runny nose
  13. shivering
  14. sore throat
  15. sweating
  16. trouble sleeping
  17. unusual tiredness or weakness
  18. vomiting

Less common

  1. Bleeding, blistering, burning, coldness, discoloration of the skin, feeling of pressure, hives, infection, inflammation, itching, lumps, numbness, pain, rash, redness, scarring, soreness, stinging, swelling, tenderness, tingling, ulceration, or warmth at the insertion site
  2. bloating
  3. blurred vision or other changes in vision
  4. breast discharge
  5. breast enlargement
  6. burning feeling while urinating
  7. difficult or painful urination
  8. difficulty with breathing
  9. difficulty with swallowing
  10. dizziness
  11. headache, severe and throbbing
  12. lumps in the breasts
  13. nervousness
  14. noisy breathing
  15. painful or tender cysts in the breasts
  16. pounding in the ears
  17. puffiness or swelling of the eyelids or around the eyes, face, lips, or tongue
  18. shortness of breath
  19. skin rash, hives, itching
  20. slow or fast heartbeat
  21. stomach or pelvic discomfort, aching, or heaviness
  22. swelling of the hands, ankles, feet, or lower legs
  23. tightness in the chest


  1. Collection of blood under the skin at the insertion site
  2. deep, dark purple bruise at the insertion site

Some side effects may occur that usually do not need medical attention. These side effects may go away during treatment as your body adjusts to the medicine. Also, your health care professional may be able to tell you about ways to prevent or reduce some of these side effects. Check with your health care professional if any of the following side effects continue or are bothersome or if you have any questions about them:

More common

  1. Back pain
  2. blemishes on the skin, pimples
  3. body aches or pain
  4. crying
  5. depersonalization
  6. discouragement
  7. dysphoria
  8. ear congestion
  9. euphoria
  10. feeling sad or empty
  11. hoarseness
  12. increased clear or white vaginal discharge
  13. increased weight
  14. irregular bleeding cycle
  15. irritability
  16. itching of the vagina or genital area
  17. light vaginal bleeding between regular menstrual periods
  18. loss of interest or pleasure
  19. loss of voice
  20. mental depression
  21. nasal congestion
  22. pain, cramps, or heavy menstrual bleeding
  23. pain during sexual intercourse
  24. pain or tenderness around the eyes and cheekbones
  25. paranoia
  26. quick to react or overreact emotionally
  27. rapidly changing moods
  28. stomach pain
  29. tender, swollen glands in the neck
  30. thick, white vaginal discharge with no odor or with a mild odor
  31. trouble concentrating
  32. voice changes

Less common

  1. Abnormal ejaculation
  2. abnormal or decreased touch sensation
  3. belching
  4. bone pain
  5. burning feeling in the chest or stomach
  6. decreased interest in sexual intercourse
  7. difficulty having a bowel movement
  8. difficulty with moving
  9. dull ache or feeling of pressure or heaviness in the legs
  10. excess air or gas in the stomach or intestines
  11. feeling of vaginal pressure
  12. feeling of warmth
  13. hair loss or thinning of the hair
  14. heartburn
  15. inability to have or keep an erection
  16. increased appetite
  17. increased hair growth on the forehead, back, arms, and legs
  18. indigestion
  19. itching skin near damaged veins
  20. lack or loss of strength
  21. loss in sexual ability, desire, drive, or performance
  22. muscle cramping or stiffness
  23. passing gas
  24. pelvic pain
  25. redness of the face, neck, arms, and occasionally upper chest
  26. redness, swelling in the ear, or earache
  27. sleepiness or unusual drowsiness
  28. sneezing
  29. stomach bloating and cramping
  30. stuffy nose
  31. swollen joints
  32. tenderness in the stomach area
  33. vaginal burning or pain
  34. weight loss

Other side effects not listed may also occur in some patients. If you notice any other effects, check with your healthcare professional.

Call your doctor for medical advice about side effects. You may report side effects to the FDA at 1-800-FDA-1088.