IVF Trigger Shot: Complete Guide to 3 Key Facts
TL;DR — Quick Summary
- The IVF trigger shot tells your body to release mature eggs for retrieval.
- Most trigger shots use hCG (like Ovitrelle/Ovidrel or Choriomon). Lupron is used when OHSS risk is a concern.
- Timing is everything — your doctor will give you a specific injection window, usually 34–36 hours before retrieval.
- Side effects are usually mild: bloating, pelvic discomfort, and injection site tenderness.
- Fast IVF carries European-brand trigger shot medications at prices well below US retail.
If you’re going through an IVF cycle, your doctor will likely prescribe an IVF trigger shot near the end of your stimulation phase. This single injection is one of the most important steps in your entire cycle. Understanding what it does — and why timing matters so much — can help reduce stress and keep your protocol on track.
What Is the IVF Trigger Shot?
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The IVF trigger shot is an injection that starts the final maturation of your eggs and gets them ready to be retrieved. Without it, your eggs won’t fully mature or release on schedule. Doctors use it to control the exact timing of ovulation so egg retrieval can happen at the right moment.
Most trigger shots contain human chorionic gonadotropin (hCG). This hormone acts the same way as your body’s natural LH surge — it matures the egg inside the follicle and signals it to release. Common hCG-based options include Ovitrelle (Ovidrel) and Choriomon, both available through Fast IVF at significantly lower prices than US pharmacies.
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A second type uses Leuprolide Acetate (Lupron). Your doctor may prefer a Lupron trigger if there’s a risk of Ovarian Hyperstimulation Syndrome (OHSS), since it carries a lower OHSS risk compared to hCG triggers. You can read more about all IVF medications used in a typical protocol to understand how the trigger fits in.
How Does the IVF Trigger Shot Work?
Once your follicles have grown to the right size during stimulation, your doctor will tell you exactly when to take your trigger shot. That timing is typically 34–36 hours before your scheduled egg retrieval. This window isn’t flexible — you’ll need to set an alarm and follow instructions carefully.
Too early, and eggs won’t be mature yet. Too late, and the follicles may already have ovulated, leaving nothing to retrieve. If you’re changing time zones or daylight saving time is coming up, double-check your timing with your clinic.
The trigger shot is also used in IUI cycles and natural cycle monitoring to help time insemination or intercourse. If you’re comparing treatment options, our IVF vs IUI guide breaks down how each protocol uses this medication differently.
What Are the Side Effects of the Trigger Shot?
Most people tolerate the trigger shot well. The most common side effects are bloating and mild pelvic or abdominal discomfort. Some patients also notice soreness or redness at the injection site. These usually pass within a day or two.
A more serious but rare complication is OHSS (Ovarian Hyperstimulation Syndrome). This happens when the ovaries over-respond to the trigger and swell with fluid. Mild OHSS causes nausea, bloating, and digestive discomfort. Severe OHSS is rare but can be dangerous — warning signs include rapid weight gain (more than 2 lbs/day), severe stomach pain, difficulty breathing, and very low urine output. Call your doctor right away if you notice any of these symptoms.
Patients at higher risk for OHSS may be switched to a Lupron trigger, which significantly lowers that risk. For tips on managing injections in general, see our guide on how to avoid bruising after IVF injections.
According to the American Society for Reproductive Medicine (ASRM), OHSS is more likely in patients with polycystic ovary syndrome (PCOS) or a high antral follicle count. Your doctor will monitor your response closely throughout stimulation.
Where Can I Get Trigger Shot Medications at a Lower Cost?
IVF medications including trigger shots can cost hundreds of dollars at US pharmacies, but many patients don’t realize there are legal, licensed alternatives. Fast IVF sources European-brand IVF medications — the same active ingredients, made by the same manufacturers — at prices that can be up to 80% lower than US retail.
You can order Ovitrelle (Ovidrel) and Choriomon HCG directly through Fast IVF with a valid prescription. All orders are shipped in cool packs via air transportation for temperature-sensitive medications. Check our FAQ & Policies page for prescription and ordering details, or get a free price quote to compare your current costs.
Frequently Asked Questions About the IVF Trigger Shot
What time should I take my IVF trigger shot?
Your doctor will give you a specific time based on your retrieval appointment. The trigger is usually taken 34–36 hours before egg retrieval. Set an alarm and confirm the time with your clinic — even a small error in timing can affect your results.
Can I use a Lupron trigger instead of hCG?
Yes. If your doctor is concerned about OHSS, a Lupron (leuprolide acetate) trigger is a common alternative. It works differently than hCG but still triggers final egg maturation. Your doctor may check your blood levels after to confirm the response and decide if a booster dose is needed.
Does the trigger shot hurt?
Most patients find it manageable. Ovitrelle is a subcutaneous (under the skin) injection, which is generally less uncomfortable than intramuscular shots. Soreness or redness at the injection site is normal. Injection videos on our Videos & Instruction page show exactly how to administer it.
How much does the IVF trigger shot cost?
In the US, hCG trigger shots like Ovidrel can cost $80–$150 or more per dose at a retail pharmacy. Through Fast IVF, European-brand equivalents like Ovitrelle and Choriomon are available at a fraction of that price. Visit our Fast Quote page for current pricing.
Do I need a prescription for the trigger shot?
Yes. All IVF medications, including trigger shots, require a valid prescription from a licensed physician. Fast IVF will ask for a copy of your prescription before processing your order. See our FAQ & Policies for details on how to submit it.