Cetrotide (Cetrorelix) belongs to the class of medications called GnRH antagonists. Cetrotide (Cetrorelix) is used to prevent premature ovulation in women undergoing ovarian stimulation. It blocks the effects of gonadotropin-releasing hormone (GnRH). GnRH controls the secretion of another hormone, called luteinizing hormone (LH), a hormone that starts ovulation (release of an egg) during the menstrual cycle. Cetrotide (Cetrorelix) allows the release of an egg to be controlled so it is released at the best time for pregnancy to occur.

Your doctor may have suggested Cetrotide (Cetrorelix) for conditions other than those listed in these drug information articles. If you have not discussed this with your doctor or are not sure why you are using Cetrotide (Cetrorelix), speak to your doctor. Do not stop using Cetrotide (Cetrorelix) without consulting your doctor.

Do not give Cetrotide (Cetrorelix) to anyone else, even if they have the same symptoms as you do. It can be harmful for people to take Cetrotide (Cetrorelix) if their doctor has not prescribed it.

The usual dose of Cetrotide (Cetrorelix) is 0.25 mg once daily injected under the skin. Cetrotide (Cetrorelix) should be injected under the skin of the lower abdominal wall as directed by your doctor. If you are using Cetrotide (Cetrorelix) daily, use a different injection site each day to reduce irritation.

Many things can affect the dose of medication that a person needs, such as body weight, other medical conditions, and other medications. If your doctor has recommended a dose different from the ones listed here, do not change the way that you are taking the medication without consulting your doctor.

Cetrotide (Cetrorelix) is best injected under the skin of the lower abdomen a few inches below your navel. Each day, use the alternate side of your lower abdomen (e.g., left or right) to prevent soreness.

Your doctor or other health care professional will show you exactly how to mix and draw up the medication into the needles and how to inject it. Read the information leaflet carefully and ask your doctor any questions you may have.

Once the dose of medication has been prepared, it should be used immediately. Discard any unused material after use. Do not use your injectable solution if it appears cloudy, lumpy, or discoloured.

It is important to use Cetrotide (Cetrorelix) exactly as prescribed by your doctor. If you miss a dose, contact your doctor for instructions. Do not take a double dose to make up for a missed one.

Store Cetrotide (Cetrorelix) in a cool dry place between 2°C and 25°C. Do not freeze. Protect it from heat, moisture, and light and keep it out of the reach of children.

Do not dispose of medications in wastewater (e.g. down the sink or in the toilet) or in household garbage. Ask your pharmacist how to dispose of medications that are no longer needed or have expired.

Many medications can cause side effects. A side effect is an unwanted response to a medication when it is taken in normal doses. Side effects can be mild or severe, temporary or permanent.

The side effects listed below are not experienced by everyone who uses Cetrotide (Cetrorelix). If you are concerned about side effects, discuss the risks and benefits of Cetrotide (Cetrorelix) with your doctor.

The following side effects have been reported by at least 1% of people using Cetrotide (Cetrorelix). Many of these side effects can be managed, and some may go away on their own over time.

Contact your doctor if you experience these side effects and they are severe or bothersome. Your pharmacist may be able to advise you on managing side effects.

• headache
• nausea
• redness, swelling, bruising, and itching at the place of injection

Although most of the side effects listed below don't happen very often, they could lead to serious problems if you do not seek medical attention.

Stop taking the medication and seek immediate medical attention if any of the following occur:

• signs of a severe allergic reactions such as Hives; difficulty breathing; swelling of the tongue, face, mouth, or throat
• symptoms of ovarian hyperstimulation syndrome (OHSS), e.g.:
• abdominal or pelvic pain or discomfort
• bloating
• decreased amount of urine
• Diarrhea
• difficulty breathing
• nausea
• rapid weight gain
• vomiting

Some people may experience side effects other than those listed. Check with your doctor if you notice any symptom that worries you while you are taking Cetrotide (Cetrorelix).

0.25 mg
Each single dose vial (multiple dose regimen) of sterile lyophilized powder contains 0.25 mg of Cetrotide (Cetrorelix) as Cetrotide (Cetrorelix) acetate and 54.80 mg of mannitol. Cartons of one packaged tray. Each packaged tray contains one glass vial containing 0.25 mg of Cetrotide (Cetrorelix) acetate, one prefilled glass syringe with 1 mL of sterile water for injection, Ph.Eur., one 20 gauge needle (yellow), one 27 gauge needle (grey), and two alcohol swabs.

Do not use Cetrotide (Cetrorelix) if you:

• are allergic to Cetrotide (Cetrorelix), extrinsic peptide hormones, mannitol, or any ingredients of the medication
• are allergic to gonadotropin-releasing hormone (GnRH) or other GnRH-related hormones (e.g., Leuprolide, Goserelin)
• are or may be pregnant
• are breast-feeding
• have moderate-to-severe liver function impairment
• have moderate-to-severe kidney function impairment

Tell your doctor or prescriber about all prescription, over-the-counter (non-prescription), and herbal medications that you are taking. Also tell them about any supplements you take. Since caffeine, alcohol, the Nicotine from cigarettes, or street drugs can affect the action of many medications, you should let your prescriber know if you use them. Depending on your specific circumstances, your doctor may want you to:

• stop taking one of the medications,
• change one of the medications to another,
• change how you are taking one or both of the medications, or
• leave everything as is.

An interaction between two medications does not always mean that you must stop taking one of them. Speak to your doctor about how any drug interactions are being managed or should be managed.

Before you begin using a medication, be sure to inform your doctor of any medical conditions or Allergies you may have, any medications you are taking, whether you are pregnant or breast-feeding, and any other significant facts about your health. These factors may affect how you should use Cetrotide (Cetrorelix).

Allergic reactions: Severe allergic reactions and anaphylactic reactions have been reported with the use of Cetrotide (Cetrorelix). If you have active allergies or are prone to allergies, discuss with your doctor how Cetrotide (Cetrorelix) may affect your medical condition, how your medical condition may affect the dosing and effectiveness of Cetrotide (Cetrorelix), and whether any special monitoring is needed.

Ovarian hyperstimulation syndrome (OHSS): Cetrotide (Cetrorelix) is used to prevent premature ovulation in women undergoing ovarian stimulation. Ovarian stimulation can cause a condition called ovarian hyperstimulation syndrome (OHSS). It may develop during or after ovarian stimulation. With OHSS, too many follicles grow and cause abdominal discomfort or pain, nausea, diarrhea, and sometimes difficulty breathing. If you experience any of these symptoms, contact your doctor immediately.

Pregnancy: The effect of Cetrotide (Cetrorelix) on an unborn baby is not known. To avoid the possibility of harm to the baby, Cetrotide (Cetrorelix) should not be used during pregnancy.

Breast-feeding: It is not known if Cetrotide (Cetrorelix) passes into breast milk. If you are a breast-feeding mother and are taking Cetrotide (Cetrorelix), it may affect your baby. Women who are taking Cetrotide (Cetrorelix) should not breast-feed.

Children: Cetrotide (Cetrorelix) is intended for use by women of child-bearing age. Its safety and effectiveness have not been established for children.

Seniors: Cetrotide (Cetrorelix) is intended for use by women of child-bearing age. Its safety and effectiveness have not been established for seniors.