Most IVF patients give themselves roughly 30 to 40 injections over two to four weeks — and it is usually the part they find far more manageable than expected. This hands-on guide explains what each injection in an IVF cycle does, how to prepare and inject at home, how much it hurts, and what to do when side effects or dosing mistakes happen.
Data in this article is sourced from the CDC National ART Surveillance System, public ASRM patient guidelines, and Cleveland Clinic and NHS patient education materials, compiled by the ProIVF Medical Editorial Team and reviewed by the ProIVF Medical Advisory Board.
Which Injections Are Used in an IVF Cycle?
An IVF cycle usually involves three phases of injections, each with a different purpose. Understanding what each shot does helps you see why the timing matters so much.
This guide covers the practical side — what to inject, when, where and how. For drug-by-drug selection, dosing logic and cost comparisons, see our complete guide to IVF medications.
Ovarian stimulation injections — days 1–14
Stimulation injections contain follicle-stimulating hormone (FSH), luteinizing hormone (LH), or a combination, and are given once or twice daily for roughly 8 to 14 days so that multiple follicles grow at once instead of the single egg your body would normally produce. A typical daily dose of 150 to 300 IU fills only 0.3 to 0.5 mL — a very small amount of fluid, and far less painful than most people expect.
Brand examples include Gonal-F, Follistim, Menopur (human menopausal gonadotropin, hMG, which naturally contains both FSH and LH), Merional and Pergoveris (which combines FSH and LH activity). Most patients inject these into the abdomen using a short, thin needle, and the Cleveland Clinic’s IVF overview describes the full stimulation process and what to expect at each step.
GnRH antagonist injections — around day 5–7
To stop ovulation happening too early, your clinic will add a GnRH antagonist injection such as Cetrotide or Ganirelix, usually from around day 5 to 7 of stimulation until the trigger shot. These are given once daily at a fixed time, and can be mixed in the same syringe as your FSH dose if your clinic confirms the two are compatible.
The trigger shot — one night only
When the lead follicles reach about 17 to 22 mm, you take a single “trigger” injection to mature the eggs and schedule egg retrieval 34 to 36 hours later. The trigger is usually hCG (Ovidrel, Novarel, Pregnyl) at typical doses of 5,000 to 10,000 IU, and when there is a risk of ovarian hyperstimulation syndrome (OHSS), clinics switch to a GnRH agonist such as Lupron (leuprolide acetate) for a “dual trigger” or replacement trigger, which lowers the chance of OHSS.
The shot is named for its timing — most clinics ask you to inject at a fixed time in the evening on a set date, and that exact timing directly controls when retrieval happens.
Progesterone support injections — after retrieval
After egg retrieval, progesterone prepares the uterine lining for implantation. Many clinics prescribe intramuscular progesterone in oil (PIO) — a thicker, oil-based injection into the buttock muscle given daily, often for 10 to 12 weeks when a pregnancy is confirmed — while others use vaginal suppositories, gels, or oral options that avoid injections entirely.
A standard fresh IVF cycle therefore typically involves 10–14 days of stimulation injections, 1 trigger shot, and daily progesterone support from the day after retrieval through the first trimester if pregnancy occurs.
How to Give Yourself an IVF Injection at Home
Your clinic should always demonstrate the first injection and give you written instructions. The technique below matches what most US and UK clinics teach.
Step 1: Prepare your supplies
Wash your hands, then lay out: the medication, an alcohol wipe, a cotton ball or gauze, a sharps container, and the prescribed needle and syringe. If your medication is refrigerated, take it out 20 to 30 minutes early so it is less cold and stings less.
Step 2: Choose and clean the site
For subcutaneous shots, alternate sides of the lower abdomen, at least 2 inches (about 5 cm) away from the navel, pinching a fold of skin. For PIO intramuscular shots, use the upper outer quadrant of the buttock; a nurse or partner is often needed for this site.
Step 3: Inject slowly
Insert the needle at a 45 to 90 degree angle depending on the injection type, push the plunger slowly over 10 to 15 seconds, then release the skin fold before withdrawing. Press a cotton ball on the site for a few seconds and do not rub, as this can bruise and spread the medication.
Step 4: Record and dispose
Note the time and dose in your medication log, and place the used needle directly into a sharps container. Never recap a used needle by hand.
How Painful Are IVF Injections?
For most people the fear is worse than the pain. Stimulation injections use very fine needles (typically 29–31 gauge for subcutaneous shots), and most patients describe the sensation as a brief pinch.
The most uncomfortable injection is usually the intramuscular progesterone in oil, which is thicker and can cause a burning feeling during injection and a sore muscle afterward. Techniques that help: ice the site for 5–10 minutes first, warm the PIO syringe in your hands, inject slowly, and move the injection site between sides.
Common Side Effects and How to Manage Them
- Bruising and redness at the injection site — the most common side effect; use a new site each day and apply a cold compress.
- Mild bloating and pelvic discomfort — expected as the ovaries enlarge; wear loose clothing, stay hydrated, and avoid strenuous exercise.
- Mood swings and fatigue — driven by rising estrogen; plan for extra rest during stimulation.
- Headaches and hot flushes — common with estrogen and progesterone; discuss with your clinic before taking pain relievers.
- Lumps or hardness at the injection site — common with slow-absorbing oil-based PIO; apply heat and massage gently (avoiding the fresh injection site), and tell your clinic if a lump lasts more than a week or becomes painful, so they can consider switching delivery methods.
- Signs of infection that need immediate care — warmth, spreading redness, severe pain or pus at the injection site, along with fever or chills, can indicate infection.
- OHSS (rare but serious) — rapid weight gain, severe bloating, low urine output or breathing difficulty require immediate medical attention.
“Ovarian hyperstimulation syndrome (OHSS) is an exaggerated response to excess hormones.” — American Society for Reproductive Medicine, ASRM, Ovarian Hyperstimulation Syndrome patient FAQ
The ASRM and the CDC ART program publish updated safety information on ovarian stimulation and OHSS prevention.
What If You Miss a Dose or Make a Mistake?
If you miss a dose, do not double the next one — call your clinic’s emergency line immediately and they will tell you whether to take the missed dose, adjust timing, or skip it. Common mistakes like injecting the wrong dose, hitting a bruise, or bending a needle are rarely dangerous, but every clinic wants to know so they can keep the cycle on track, so keep the clinic’s 24-hour number somewhere visible.
Patient Experiences: What the Injections Were Actually Like
The following patient stories are shared with consent. Names and identifying details have been changed to protect privacy.
Emily, 34, California, USA — first cycle, successful. Emily did 10 days of Gonal-F plus Cetrotide, costing about $4,500 for the medications. “The first night I sat with the needle for twenty minutes. My husband offered to do it, and I cried — not from pain, from relief that someone was going to help. By day four I could do it in my kitchen in three minutes. I got 12 eggs, 5 blasts, and my first transfer worked.”
Sarah, 38, London, UK — two cycles, second successful. Sarah used Menopur and Cetrotide with her NHS-supported cycle and paid about £1,800 for the extra medications. “The bruises looked dramatic and the trigger shot at 10 p.m. gave me panic — I had to drive my own timing. But the retrieval was the easy part. My second transfer gave me my son.”
Mei, 41, Bangkok, Thailand — one cycle, successful after PGT-A. Mei’s medication cost about $2,900 including the PIO progesterone injections, which she found the hardest. “Nobody warns you the oil injection burns. A nurse came to my apartment to teach my husband, and heating the syringe in his hands changed everything. I had 6 eggs, 1 normal embryo after testing, and she is three now.”
FAQ
Q: How many injections are in an IVF cycle?
Most patients give roughly 30 to 40 injections over 2 to 4 weeks: 10–14 days of stimulation shots, about 5–7 days of antagonist shots, 1 trigger shot, and daily progesterone support after retrieval.
Q: Do all IVF patients need injections?
Almost all stimulation cycles require injections, but some clinics offer mild or mini-stimulation protocols with lower doses, and natural-cycle IVF may use few or 0 stimulation drugs. Progesterone support can also be given as vaginal gel or suppositories instead of injections.
Q: Can I do the injections myself?
Yes. Most clinics expect you to self-inject the subcutaneous shots and will demonstrate the first one, and intramuscular progesterone in oil is often easier with a partner or nurse.
Each injection requires a new sterile needle and syringe — never reuse 1 needle for 2 doses, as reuse risks infection and inaccurate dosing.
Q: What time of day should I take my IVF injections?
Take stimulation and antagonist injections at a consistent time, usually in the evening. The trigger shot must be taken at the exact time your clinic specifies, because egg retrieval is scheduled 34 to 36 hours later.
Q: Which injection hurts the most?
The intramuscular progesterone in oil (PIO) is generally the most uncomfortable because the oil is thick. Subcutaneous stimulation shots with fine 29–31 gauge needles are usually described as a brief pinch.
Q: How long do IVF injection side effects last?
Most side effects such as bloating, bruising and mood swings ease within days of stopping the stimulation drugs. Progesterone-related fatigue continues while you take support — typically 10 to 12 weeks after a confirmed pregnancy.
Q: Do I need to fast or take any precautions before an injection?
No fasting is required, but avoid 2 things: injecting on an empty stomach (some people feel dizzy or nauseous) and applying lotions or creams to the site beforehand. Keep the skin clean and dry, and if it is red, broken or rashy, switch to the other side and tell your clinic.
Q: Are IVF injections covered by insurance?
Coverage varies widely. Some US states mandate fertility coverage that includes medication, while other patients pay $3,000 to $7,000 per cycle out of pocket for drugs.
Check with your insurer and ask your clinic about pharmacy discount programs and fertility grants.
How to Plan Your IVF Journey
The injections are the most visible part of IVF, but they are also the most routine: clinics guide patients through them successfully every day, and most people adjust within a few days. Prepare by learning your protocol in advance, setting up a medication log, arranging a partner or nurse for the PIO shots, and keeping your clinic’s emergency number handy.
You can compare clinic protocols, medication policies and support programs across centers in our hospital directory, or contact our team for help choosing a clinic that fits your needs.
This article was written by the ProIVF Medical Editorial Team, reviewed by the ProIVF Medical Advisory Board, and is based on publicly available data from the CDC, ASRM, Cleveland Clinic and the NHS to provide objective, accurate information for patients.
This article is for informational purposes only and does not replace professional medical advice. Always follow your clinic’s specific instructions for medication, dosing and injection technique. Last updated: August 3, 2026.
