Ganirelix Injection: Uses, Dosage, Side Effects, Precautions and Alternates

Quick overview

Ganirelix Injection (ganirelix, ganirelix acetate) is a GnRH antagonist given as a shot under the skin during fertility treatment. It is used to prevent premature LH surges or early ovulation in women undergoing controlled ovarian hyperstimulation, often as part of IVF cycles. It is typically given once daily at a dose of 250 micrograms during ovarian stimulation. It is used together with other fertility medicines and is not indicated for children, men, or routine use in older adults.

What is Ganirelix Injection

Ganirelix is an injectable prescription medicine used during fertility treatment. It belongs to a group of medicines called GnRH antagonists (or GnRH blockers) and is given as a shot under the skin.

Ganirelix Injection uses

• Prevents premature luteinizing hormone (LH) surges or ovulation in women undergoing controlled ovarian hyperstimulation as part of fertility treatment
• May help reduce the need for follicle-stimulating hormone (FSH), which is also needed for ovulation
• Used with other medicines to treat infertility in women
• Used to delay the ovaries from releasing eggs too early during in vitro fertilization (IVF) cycles

Benefits of Ganirelix Injection

• Helps prevent a premature LH surge during fertility treatment
• Helps stop early ovulation before eggs are ready for retrieval
• Supports better control of ovarian stimulation cycles during IVF or similar treatments
• Helps fertility specialists time the trigger injection and egg retrieval more accurately
• Allows follicles to continue developing until they reach the desired maturity

How Ganirelix Injection works

Ganirelix blocks a hormone called GnRH, which normally signals the body to release luteinizing hormone (LH). LH tells the body to ovulate, so by blocking it, ganirelix delays ovulation. This lets your doctor control when you ovulate so that fertility treatment steps, like egg retrieval, are timed correctly.

Ganirelix Injection dosage

Ganirelix is given as a shot under the skin of the stomach or thigh. A nurse or trained health professional may give this medicine, or you may be taught to give it to yourself at home. Follow the patient instructions in the package carefully for how to prepare the injection, use disposable syringes, and store them. Use at regular intervals and do not use it more often than directed. Prepare an injection only when you are ready to give it.

Do not reuse a needle or syringe; each prefilled syringe should be thrown away after one use, even if medicine remains inside. Wash your hands with soap and water before injecting, and wipe the injection site with an alcohol swab first. Inject at least 2 inches away from the belly button if using the stomach area, or use the upper thigh, and change the injection site each time.

Use is not recommended for children. Talk with your care team about use of this medicine in children, as special care may be needed.

Available forms and strengths

Solution for injection (prefilled syringe)

Side effects of Ganirelix Injection

Common

• Headache
• Pain, redness, discoloration, or swelling at the injection site
• Nausea
• Stomach or pelvic pain
• Bloating
• Diarrhea
• Vaginal bleeding

Serious

• Signs of ovarian hyperstimulation syndrome (OHSS): severe stomach or pelvic pain, bloating, severe nausea or vomiting, diarrhea, rapid weight gain, little or no urination, trouble breathing, rapid heart rate, or feeling short of breath (especially when lying down)
• Severe allergic reaction: hives, skin rash, itching, swelling of the face, eyelids, lips, tongue, throat, hands, legs, feet, or sex organs, trouble breathing or wheezing, trouble swallowing or throat tightness, dizziness or fainting, racing heart, fever or general ill feeling, swollen lymph nodes, joint pain, stomach cramps
• Chest tightness, cough, or difficulty swallowing
• Unusual tiredness or weakness
• Heavy non-menstrual vaginal bleeding
• Miscarriage (pregnancy loss)

Warnings and precautions

• This medicine may cause serious allergic reactions, including anaphylaxis and swelling of the face, lips, tongue, or throat, which can be life-threatening and need immediate medical attention.
• Do not use this medicine if you are allergic to latex, since the needle cover of the prefilled syringe may contain dry natural rubber (a form of latex).
• This medicine can cause ovarian hyperstimulation syndrome (OHSS), a condition where the ovaries become swollen and painful and may leak fluid, which can sometimes be serious.
• Even though this medicine is used as part of a program to help you get pregnant, taking it while you are already pregnant can harm your unborn baby. Follow your doctor's instructions carefully about birth control or pregnancy testing during treatment.
• Your doctor will need to check your progress often with regular visits, ultrasounds, and blood hormone tests to make sure the medicine is working properly and to check for unwanted effects.
• Do not use this medicine if you are pregnant or think you might be pregnant, because it may cause birth defects or harm to an unborn baby. 
• Your doctor may want you to have a pregnancy test before you start treatment. If you become pregnant while using this medicine, tell your doctor right away.
• It is not known if this medicine passes into breast milk, and you should not breastfeed while using it. Tell your healthcare provider if you are breastfeeding or plan to breastfeed.
• Tell your care team if you have kidney disease or liver disease before starting this medicine.
• It isn't known whether drinking alcohol affects this medicine. Follow your doctor's instructions about any restrictions on food, beverages, or activity while using it.

Storage

• Store at 20–25°C (68–77°F) at controlled room temperature.
• Keep the prefilled syringe in its original packaging until ready for use.
• Protect from light and excessive heat.
• Do not freeze or expose the injection to extreme temperatures.
• Inspect before use; do not use if the solution is cloudy, discolored, or contains particles.
• Keep securely stored and out of reach of children.

When to see a doctor

• Call your doctor right away if you notice a rash, itching, hoarseness, large hive-like swelling of the face, eyelids, lips, tongue, throat, hands, legs, feet, or sex organs, trouble breathing, trouble swallowing, or any swelling of your hands, face, or mouth.
• Stop using this medicine and tell your healthcare provider right away if you have severe stomach pain or swelling, trouble breathing, severe nausea or vomiting, rapid weight gain, or are urinating much less than usual — these can be signs of ovarian hyperstimulation syndrome.
• If you have any reason to think you are pregnant, stop taking this medication right away and contact your care team.
• If you think you have taken too much of this medicine, contact a poison control center or go to an emergency room right away.

Alternatives

• Leuprolide
• Orgalutran
• Fyremadel
• Cetrotide