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Antagon (Ganirelix)

Also Known as Orgalutran

Prescription medicineOnly Available By Prescription

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What if I find a lower price with another pharmacy?

We guarantee the lowest price on all of our prescription products. If you find your medications cheaper at any other recognized licensed mail order pharmacy, we will not only match their price, we will beat it by 25% of the difference. It is our 125% price match guarantee!

Example: If you find a product on Canada Drugs Direct for $50.00 and find the same product for $40.00 at another mail order pharmacy, we will provide you with a $12.50 discount, bringing your total to $37.50.

To get the discount please make sure to mention the price match to the customer service team when they call to collect payment for your order. Or call toll free at 1-888-904-8467 to place the order through the phone.

Terms & Conditions of Program

  • Guaranteed lowest price is only valid at the time of sale.
  • We will only match the current advertised price.
  • Products must be identical and in stock at the time of placing an order with a licensed mail order pharmacy. The must be a member of CIPA (Canadian International Pharmacy Association).
  • Products must be authentic in brand and size (same manufacturer, same country of manufacture, same pack size, same strength and same quantity).
  • Products must be new. We cannot match the price of any used, short expiry or expired product.
  • Price match can only be issued over the phone with our customer service team
What is a Generic Drug?

A generic drug is a copy of the brand-name drug with the same dosage, safety, strength, quality, consumption method, performance, and intended use. Before generics become available on the market, the generic company must prove it has the same active ingredients as the brand-name drug and works in the same way and in the same amount of time in the body.

The only differences between generics and their brand-name counterparts is that generics are less expensive and may look slightly different (eg. different shape or color), as trademarks laws prevent a generic from looking exactly like the brand-name drug.

Generics are less expensive because generic manufacturers don't have to invest large sums of money to develop a drug. When the brand-name patent expires, generic companies can manufacture a copy of the brand-name and sell it at a substantial discount.


Antagon (Ganirelix) is a medication classified as a gonadotropin-releasing hormone (GnRH) antagonist. It works by blocking the effects of GnRH, a hormone that signals the release of luteinizing hormone (LH) and follicle-stimulating hormone (FSH) from the pituitary gland. By blocking the release of LH and FSH, Ganirelix prevents premature ovulation in women undergoing fertility treatment of controlled ovarian hyperstimulation.

Fact Table




US DailyMed, EU EMA



Legal status


Chemical Name


Elimination half-life

16.2 hours

Dosage (Strength)

0.25mg / 0.5ml


Consult Doctor



Protein binding


PubChem CID



Not Available


Not Available

ATC code






Routes of administration

Subcutaneous injection


Ganirelix is administered as a subcutaneous injection. The usual dose is 250 mcg daily during the middle to latter part of the follicular stage, after starting FSH therapy on the cycle’s second or third day. The Ganirelix injection should only be administered under the supervision of a healthcare provider experienced in infertility treatment.


The active ingredient in Antagon is ganirelix acetate.


Avoid taking or using this medication if any of the following apply:

  • Known or suspected pregnancy
  • Hypersensitivity to Ganirelix, LHRH or LHRH analogs
  • History of severe allergic reactions to gonadotropin-releasing hormone (GnRH) or GnRH analogs


  • Before taking Ganirelix, tell your doctor about any of the following:
    • If you have an allergy to Ganirelix or similar medications
    • About all medications you take, especially if you are taking hormonal treatments or other medications that may interfere with hormone regulation.
    • About any medical conditions you have, including liver and kidney problems.
    • If you are pregnant or plan to become pregnant, Ganirelix may cause harm to an unborn baby.
    • If you are breastfeeding or plan to breastfeed. Ganirelix can pass into your breastmilk and can cause harm to your baby.
  • Ganirelix is given via injection and can lead to itching, swelling, or redness at the site of injection. If these symptoms persist or get worse, reach out to your healthcare provider.
  • Be vigilant for signs of Ovarian Hyperstimulation Syndrome (OHSS), a condition that could be severe. These signs may include feelings of bloating or pain in the abdomen, nausea, vomiting, or sudden weight gain.
  • Immediate medical assistance may be necessary if you experience difficulties with breathing, develop a rash or hives, or notice swelling in your face, eyes, lips, tongue, or throat after using Ganirelix, as these could indicate serious allergic reactions.
  • Certain drugs may interact with Ganirelix, influencing its efficacy or leading to unwanted side effects. Make sure to tell your healthcare provider about any other medications you’re currently taking.
  • Supervision by a healthcare professional is necessary to monitor hormonal levels and ovarian response during Ganirelix treatment.

Side Effects

As with any medication, there are potential side effects to consider before starting treatment. The most common side effects of Ganirelix include stomach pain, headache, and vaginal bleeding. These side effects are usually mild and go away on their own. However, if they persist or become severe, it is important to contact a healthcare provider.

In rare cases, Ganirelix may cause more serious side effects. These may include symptoms or signs of an allergic reaction, such as skin rash, swelling of the face, lips, tongue, or throat, and difficulty breathing. If any of these symptoms occur, it is important to seek medical attention immediately.


  1. Antagon (Ganirelix) Prescribing Information. Merck & Co., Inc. Accessed August 9, 2023.
  2. Antagon (Ganirelix) Drug Label. West Orange, NJ: Organon, Inc.; 2023.

IMPORTANT NOTE: The above information is intended to increase awareness of health information and does not suggest treatment or diagnosis. This information is not a substitute for individual medical attention and should not be construed to indicate that use of the drug is safe, appropriate, or effective for you. See your health care professional for medical advice and treatment.

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