Progesterone shots after IVF — usually an oil-based injection called PIO (progesterone in oil) — keep the uterine lining receptive and support early pregnancy. Most patients inject once daily for roughly 8 to 12 weeks: from the day before or day of transfer until 10–12 weeks of pregnancy after a positive test, stopping within days after a negative one.
The evidence is strong: a Cochrane review of 94 randomized trials involving 26,198 women confirmed that progesterone supplementation improves implantation and pregnancy rates in IVF cycles.
The data in this article comes from peer-reviewed medical literature (including van der Linden et al., Cochrane Database of Systematic Reviews, 2015; Pan et al., PLoS One, 2018), public ASRM guidance, and the CDC National ART Surveillance System. It was compiled by the ProIVF Medical Editorial Team and reviewed by the ProIVF Medical Advisory Board.
Why Are Progesterone Shots Prescribed After IVF?
IVF removes the body’s own progesterone supply, so clinics replace it with medication — the practice called luteal phase support. In a natural cycle, a temporary gland called the corpus luteum produces progesterone after ovulation to prepare the endometrium (uterine lining) for implantation.
IVF disrupts that process in two ways:
- Ovulation induction suppresses the corpus luteum. The medications used to stimulate the ovaries, plus the GnRH (gonadotropin-releasing hormone) analogues that prevent early ovulation, leave the body producing too little of its own progesterone.
- Frozen embryo transfers have no corpus luteum at all. In a medicated FET (frozen embryo transfer) cycle the ovaries are quiet, so the entire luteal phase — the roughly two weeks after ovulation — depends on medication.
Luteal phase support means taking progesterone by injection, vaginal gel or suppository, or oral pill, keeping the endometrium thick, synchronized, and receptive when the embryo arrives. These support injections are different from the trigger shot given before egg retrieval: that one uses hCG (human chorionic gonadotropin) or Lupron (leuprolide acetate) to mature the eggs, while progesterone supports the lining afterward.
“This updated review confirms the beneficial effect of luteal phase supplementation with progesterone … on ongoing pregnancy and live birth rates in women undergoing IVF.” — van der Linden et al., Cochrane Database of Systematic Reviews, 2015
Why Injections Specifically?
Vaginal progesterone and oral pills are effective for many patients, but PIO delivers reliable, measurable blood levels with one daily injection and bypasses the liver and digestive tract. Many clinics prefer it for medicated frozen embryo transfer cycles, where consistent progesterone levels matter most.
Oral progesterone alone is generally not recommended because of low bioavailability.
How Long Do You Take Progesterone Shots After IVF?
The duration depends on the cycle outcome: positive tests lead to continuation through 10–12 weeks of pregnancy, and negative tests lead to stopping within days. Here is the typical schedule.
| Stage | Typical progesterone use |
|---|---|
| Before transfer | 5–7 days of progesterone (injection or vaginal) to prepare the lining |
| Day of transfer to pregnancy test | Continue daily; test is usually around day 9–14 after transfer |
| Positive test | Continue through 10–12 weeks of pregnancy, often with a gradual taper |
| Negative test | Stop within a few days; your period arrives as progesterone levels fall |
The 10–12 Week Milestone
By 10 to 12 weeks of pregnancy, the placenta has taken over progesterone production, so external support is no longer needed. Some clinics stop abruptly at that point; others taper over 1 to 2 weeks.
Both approaches are common — follow your clinic’s protocol.
What If the Test Is Negative?
If your pregnancy test is negative, you stop the progesterone and your period typically follows within 3 to 7 days. This withdrawal bleed is expected, not a cause for concern.
A failed IVF cycle involves real physical and emotional recovery, and the bleeding is your body’s signal that hormonal support has ended.
How Do You Give a Progesterone Shot?
PIO is injected intramuscularly — deep into a muscle — because the oil is too thick for a shallow injection, and the standard site is the upper outer quadrant of the buttock.
Step-by-Step
- Prepare the supplies: alcohol swabs, a 1–1.5 inch 22–25 gauge needle, the PIO vial, and a gauze pad.
- Warm the oil: roll the vial between your hands or hold it under warm (not hot) water for a few minutes. Warm oil injects much more easily.
- Draw the dose: your clinic tells you the exact volume (commonly 0.5–1 mL daily, or 50–100 mg).
- Choose the site: alternate buttock cheeks each day. Imagine a cross on the buttock and inject into the upper outer quadrant.
- Inject: insert the needle quickly at a 90-degree angle and pull back slightly to check for blood — if blood appears, withdraw and use a fresh site. Then push slowly over 30–60 seconds.
- Massage and move: massage the area briefly and walk around. Movement helps disperse the oil and reduces soreness.
For a broader look at self-injection technique, pain control, and missed doses, see our guide to IVF injections.
How to Make the Shot Hurt Less
- Use a fresh needle to draw and a fresh needle to inject — a dull or stripped needle hurts more.
- Inject slowly; fast injection causes more pain and oil leakage.
- Apply a warm compress before and after.
- Have your partner or a nurse give the injection if self-injection feels hard — many patients alternate.
What Are the Side Effects of Progesterone in Oil?
Most PIO side effects are manageable, but a few need attention: injection-site soreness and lumps are very common, while allergic reactions and infection signs are rare and require prompt contact with your clinic.
| Side effect | How common | What helps |
|---|---|---|
| Soreness, redness, or a lump at the injection site | Very common | Warm compresses, massage, site rotation |
| Oil leakage from the injection site | Common | Firm pressure for a minute, then a bandage |
| Drowsiness, dizziness, bloating | Common | Take the shot at bedtime; stay hydrated |
| Breast tenderness, mood changes | Common | Expected hormonal effects |
| Allergic reaction (rash, hives, breathing trouble) | Rare | Contact your clinic or emergency care immediately |
| Signs of infection (heat, spreading redness, fever) | Rare | Contact your clinic |
Which Injection Site Reactions Are Normal?
A firm lump that lasts a few days is common and usually harmless. Call your clinic if the area becomes hot, intensely red, or increasingly painful — that can signal an infection or an oil-related reaction that needs evaluation.
Progesterone Shots vs Vaginal Gels and Suppositories: Which Is Better?
Both routes work, and the choice depends on your clinic’s protocol, your preference, and your risk profile — the Cochrane review found no clear superiority of any route for live birth rates.
| Option | Pros | Cons |
|---|---|---|
| Progesterone in oil (PIO) | Reliable blood levels; one daily dose; no vaginal irritation | Injection pain; may need help; site reactions |
| Vaginal gel (e.g., Crinone) | No needles; easy to use | Messy discharge; can be less consistent; once or twice daily |
| Vaginal suppositories (e.g., Endometrin) | No needles; flexible dosing | Dosing 2–3× daily; leakage; minor irritation |
| Oral dydrogesterone | Simple to take; growing evidence base | Less common in US practice; requires prescription availability |
“The best” option is the one you can take consistently. Some clinics combine routes (PIO plus vaginal) for high-risk cycles, though the added benefit is debated.
How Much Do Progesterone Shots Cost?
Progesterone support is usually a small part of an IVF cycle’s total cost, but it is not free: PIO boxes run roughly $50–$200, and vaginal products $200–$600 per box.
| Item | Typical US cost |
|---|---|
| PIO vial (1 mL × 10, 50 mg/mL) | $50 – $150 per box |
| PIO vial (1 mL × 10, 100 mg/mL) | $80 – $200 per box |
| Syringes and needles (per month) | $20 – $60 |
| Vaginal gel (Crinone 8%, 15 doses) | $300 – $600 per box |
| Vaginal suppositories (Endometrin 100 mg × 21) | $200 – $500 per box |
Costs vary widely by pharmacy, insurance, and country. If cost is a concern, ask your clinic about a mail-order fertility pharmacy, generic formulations, or whether vaginal options suit your protocol.
Patient Stories: What the Shots Actually Feel Like
The following patient stories are shared with consent. Names and identifying details have been changed to protect privacy.
Case 1: The First Month Was the Hardest — Age 34, Denver
Lena, 34, injected daily PIO after her first frozen transfer in Denver, tested positive, and continued progesterone until week 11.
Lena, 34, started daily PIO the day after her first frozen transfer. “The first two weeks were rough. My right buttock was sore no matter what I did, and I dreaded the nightly shot. My nurse taught me to warm the vial and inject really slowly — that changed everything. By week four it was just part of the routine.” Her test was positive, and she continued progesterone until week 11. “The day I took my last shot I almost cried, but from relief, not fear. The shots had become my little daily ritual of hope.”
Case 2: Switching Routes After an Injection Reaction — Age 38, Seattle
Priya, 38, developed an oil-absorption lump after 2 weeks of PIO in Seattle and switched to vaginal gel for the rest of the first trimester.
Priya, 38, developed a hard, painful lump after 2 weeks of PIO. “My doctor examined it and said it was an oil absorption issue, not an infection. We switched me to vaginal gel for the rest of the first trimester.” She still needed the early injections for reliable blood levels, but the change made the last month comfortable. “I was scared to switch because I thought injections were the only option. Asking the question was the best thing I did.”
Case 3: A Negative Test and Stopping the Shots — Age 31, Chicago
Sara, 31, stopped progesterone 3 days after a negative test in Chicago, and her period came about 5 days later.
Sara, 31, stopped progesterone 3 days after a negative test. “My period came about 5 days later. The hardest part wasn’t physical — it was the quiet that followed, when the daily shots stopped and there was nothing to do but wait for the next cycle.” Her clinic reviewed the protocol and adjusted transfer timing for the next attempt. “Knowing exactly when to stop, and why, made the loss feel less chaotic.”
FAQ
Q: How long after IVF transfer do you take progesterone shots?
Usually from the day before or the day of transfer through 10–12 weeks of pregnancy if the test is positive. If the test is negative, you stop within a few days and your period follows within about 3–7 days.
Q: Do progesterone shots hurt?
Many patients find them uncomfortable, especially in the first 2 weeks. Warming the oil, injecting slowly, rotating sites, and massaging afterward significantly reduce the pain.
A fresh needle for drawing and another for injecting help as well, and having your partner or a nurse give the shot can make a difference when self-injection feels hard. Taking the shot at bedtime also softens the drowsiness. If soreness persists or the site becomes hot and red, contact your clinic.
Q: Can I stop progesterone shots early?
Only on your doctor’s advice. Stopping early lowers progesterone levels and can risk the pregnancy or trigger bleeding — the placenta usually takes over production only around 10–12 weeks.
If the test is negative, early stopping is fine and expected, but confirm with your clinic first.
Q: Will I miscarry if I stop taking progesterone?
Abruptly stopping before the placenta takes over (around 10–12 weeks) can cause bleeding and threaten the pregnancy; after that point, stopping is safe because the placenta produces enough progesterone on its own. The Pan 2018 study found that even early withdrawal at the first positive test did not harm outcomes in a specific group of poor responders, but stopping early is not standard practice without your doctor’s direction.
Q: Is a vaginal gel or suppository as good as the injection?
For most patients, yes. The Cochrane review of 94 randomized trials in 26,198 women found no clear superiority of injections over vaginal routes for live birth rates.
The best option is the one you can take consistently and tolerate — discuss the trade-offs with your clinic.
Q: How many progesterone shots are needed per cycle?
If you take PIO daily from transfer to 12 weeks of pregnancy, that is roughly 90–100 injections for a successful cycle (including the 5–7 days before transfer). For an unsuccessful cycle, it is typically 15–25 injections.
Q: What happens if I miss a progesterone shot?
Take it as soon as you remember and tell your clinic. Missing 1 dose out of the 90–100 in a full cycle is rarely catastrophic, but consistent levels matter — do not double up without advice, and contact your care team for guidance.
Q: Does insurance cover progesterone shots?
Often, because progesterone is a prescription medication that costs $50–$200 per box for the injectable form. Coverage varies by plan: some cover injectables under pharmacy benefits, while others require prior authorization (approval from the insurer before the medication is covered).
Ask your clinic’s financial counselor to check coverage before the transfer.
How to Plan Your Progesterone Support
Progesterone shots are one of the most predictable parts of an IVF cycle: once you know the schedule, the technique, and the warning signs, the daily routine becomes manageable. Before your transfer, ask your clinic 3 questions — which route they recommend and why, exactly when to stop if the test is negative, and what to do about missed or painful injections.
If you are comparing clinics for your next cycle, browse our verified hospital profiles with real success-rate data and patient reviews, or talk to our team about which programs match your medical history and budget.
This article was written by the ProIVF Medical Editorial Team and reviewed by the ProIVF Medical Advisory Board. It is based on publicly available data from the Cochrane review (van der Linden et al., 2015), peer-reviewed studies, ASRM guidance, and CDC ART surveillance, and aims to provide objective, accurate information for patients.
The information on this website is for educational purposes and is not a substitute for professional medical advice. Always consult a qualified fertility specialist about your individual situation.
Last updated: August 7, 2026
