Antagon

Generic Name: ganirelix (Subcutaneous route)

ga-ni-REL-ix

Commonly used brand name(s)

In the U.S.

• Antagon

Available Dosage Forms:

• Solution

Therapeutic Class: Endocrine-Metabolic Agent

Pharmacologic Class: Luteinizing Hormone Releasing Hormone Antagonist

Uses For Antagon

Ganirelixis used as a fertility medicine to prevent premature luteinizing hormone (LH) surges in women undergoing the fertility procedure of controlled ovarian hyperstimulation. LH is involved in ovulation, which is the development of eggs in the ovaries. Ganirelix may help reduce the need for follicle-stimulating hormone (FSH) , which is also involved in ovulation.

Ganirelix is available only with your doctor's prescription.

Before Using Antagon

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:

Allergies

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.

Pregnancy

	Pregnancy Category	Explanation
All Trimesters	X	Studies in animals or pregnant women have demonstrated positive evidence of fetal abnormalities. This drug should not be used in women who are or may become pregnant because the risk clearly outweighs any possible benefit.

Breast Feeding

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.

Interactions with Medicines

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. Tell your healthcare professional if you are taking any other prescription or nonprescription (over-the-counter [OTC]) medicine.

Interactions with Food/Tobacco/Alcohol

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. Discuss with your healthcare professional the use of your medicine with food, alcohol, or tobacco.

Other Medical Problems

The presence of other medical problems may affect the use of ganirelix. Make sure you tell your doctor if you have any other medical problems.

Proper Use of Antagon

To make using ganirelix as safe and reliable as possible, you should understand how and when to use this medicine and what effects may be expected. A paper with information for the patient will be given to you with your filled prescription and will provide many details concerning the use of ganirelix. Read this paper carefully and ask your health care professional for any additional information or explanation.

Sometimes ganirelix can be given by injection at home. If you are using this medicine at home:

• Understand and use the proper method of safely preparing the medicine if you are going to prepare your own medicine.


• Wash your hands with soap and water and use a clean work area to prepare your injection.


• Make sure you clearly understand and carefully follow your doctor's instructions on how to give yourself an injection, including using the proper needle and syringe.


• Do not inject more or less of the medicine than your doctor ordered.


• Remember to move the site of injection to different areas to prevent skin problems from developing.


• Throw away needles, syringes, bottles, and unused medicine after the injection in a safe manner.


• Tell your doctor when you use your last dose of ganirelix. Your doctor will give you another medicine called human chorionic gonadotrophin (hCG) or arrange for you to get this medicine at the right time.

Dosing

The dose of this medicine will be different for different patients. Follow your doctor's orders or the directions on the label. The following information includes only the average doses of this medicine. If your dose is different, do not change it unless your doctor tells you to do so.

The amount of medicine that you take depends on the strength of the medicine. Also, the number of doses you take each day, the time allowed between doses, and the length of time you take the medicine depend on the medical problem for which you are using the medicine.

• For injection dosage form:
  
  • For treatment of female infertility:
    
    • Adults—After receiving FSH treatment on Day 2 or 3 of your menstrual cycle, 250 micrograms (mcg) of ganirelix is injected under the skin once a day during the early to midfollicular phase (about Day 7 or Day 8 of your menstrual cycle).
    
    
  
  

Missed Dose

Call your doctor or pharmacist for instructions.

Storage

Store the medicine in a closed container at room temperature, away from heat, moisture, and direct light. Keep from freezing.

Keep out of the reach of children.

Do not keep outdated medicine or medicine no longer needed.

Precautions While Using Antagon

It is very important that your doctor check your progress often at regular visits to make sure that the medicine is working properly and to check for unwanted effects. Your doctor will probably want to follow the developing eggs inside the ovaries by doing an ultrasound examination and measuring hormones in your blood stream.

If your doctor has asked you to record your basal body temperatures (BBTs) daily, make sure that you do this every day. Using a BBT record or some other method, your doctor will help you decide when you are most fertile and when ovulation occurs. It is important that sexual intercourse take place around the time when you are most fertile to give you the best chance of becoming pregnant. Follow your doctor's directions carefully.

If severe abdominal pain occurs with use of ganirelix, discontinue treatment and report the problem to your doctor immediately. Do not receive the injection of human chorionic gonadotropin (hCG) and avoid sexual intercourse.

Antagon Side Effects

Side Effects of This Medicine

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.

Stop taking this medicine and get emergency help immediately if any of the following effects occur:

Less common

• Abdominal pain (severe)


• nausea and vomiting


• weight gain (rapid)

Check with your doctor as soon as possible if any of the following side effects occur:

Less common

• Nausea


• vaginal bleeding

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:

Less common

• Headache


• redness, pain or swelling at injection site

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.

See also: Antagon side effects (in more detail)

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More Antagon resources

• Antagon Side Effects (in more detail)
• Antagon Use in Pregnancy & Breastfeeding
• Antagon Drug Interactions
• Antagon Support Group
• 0 Reviews for Antagon - Add your own review/rating

• Antagon Concise Consumer Information (Cerner Multum)


• Ganirelix MedFacts Consumer Leaflet (Wolters Kluwer)


• Ganirelix Prescribing Information (FDA)


• Ganirelix Acetate Monograph (AHFS DI)

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