ganirelix acetate at a glance
Medicine class
Gonadotrophin-releasing hormone antagonist
Usual role
Prevents a premature luteinising hormone surge during controlled ovarian stimulation
Administration
A ready-to-use injection given under the skin, usually in the upper leg
Specialist treatment
Prescribed by a clinician experienced in infertility treatment
What is ganirelix acetate used for?
UK-licensed use:
Prevention of premature luteinising hormone surges in women undergoing controlled ovarian hyperstimulation for assisted reproduction techniques.
How does ganirelix acetate work?
Ganirelix competes with natural GnRH at receptors in the pituitary gland. This rapidly and reversibly reduces release of luteinising hormone and follicle-stimulating hormone without the initial stimulation associated with GnRH agonists, helping prevent premature ovulation.
ganirelix acetate preparations and strengths
Injection
Route: Parenteral
Strengths: 0.25 mg/0.5 mL
How to take ganirelix acetate
Follow the fertility clinic’s instructions. Ganirelix is injected under the skin using a ready-to-use pre-filled syringe.
You or your partner may inject it after suitable training and with access to expert advice.
The upper leg is preferred; vary the injection site to reduce local tissue changes.
Use only if the syringe is undamaged and the solution is clear and particle-free.
Do not mix it with another medicine in the same syringe. Use a different site for other fertility injections.
Use each pre-filled syringe once and dispose of it as instructed.
ganirelix acetate side effects
Common or expected effects
- Short-lived redness or swelling at the injection site
- Headache
- Nausea
- Feeling generally unwell
Get urgent medical advice
- Severe allergic reaction, including hives, facial or throat swelling, breathing difficulty, angioedema or anaphylaxis
- Ovarian hyperstimulation syndrome associated with the wider fertility treatment, with symptoms such as worsening abdominal swelling or pain, vomiting, reduced urine or breathlessness
- Possible ectopic pregnancy symptoms, including one-sided lower abdominal pain, shoulder-tip pain, vaginal bleeding, dizziness or fainting
ganirelix acetate in pregnancy
Ganirelix acetate is contraindicated during pregnancy. Tell the fertility team if pregnancy is suspected so they can advise on treatment and arrange follow-up.
ganirelix acetate while breastfeeding
Ganirelix acetate is contraindicated while breastfeeding because it is not known whether it passes into breast milk. Discuss feeding plans with the fertility specialist before treatment.
ganirelix acetate interactions
Formal interaction studies have not been performed. Give the fertility team a complete list of medicines, supplements and non-prescription products.
Histamine-releasing medicines
An interaction cannot be excluded; disclose their use, particularly if you have an active or severe allergic condition.
Common questions about ganirelix acetate
Answers are fully visible for fast scanning and source review.
Why is ganirelix acetate used during IVF?
It prevents the natural luteinising hormone surge that could release eggs before planned maturation and collection.
Does ganirelix acetate stimulate the ovaries?
No. Other fertility medicines stimulate follicle development; ganirelix temporarily blocks the hormone surge that can cause premature ovulation.
Is ganirelix acetate the trigger injection?
Sources
These sources were used to prepare and review this medicine page.
Prepared and reviewed by the iatroX editorial team.