Puregon contains follitropin beta, a manufactured form of FSH that grows several follicles at once. The side effects are usually an injection site reaction, headache, abdominal pain and bloating, and they build as the stimulation progresses.
What sets it apart practically is the pen with cartridges. You set a dose and inject, with no powder to dissolve. That saves time at a moment when you already have plenty to remember.
What does Puregon do?
Puregon temporarily takes over the role of your own FSH. FSH is the hormone that matures a follicle each cycle. By injecting it at a higher dose, several follicles grow at once.
That is the whole purpose of the stimulation phase: more mature eggs at retrieval than a natural cycle would give.
The drug does not start ovulation. The trigger at the end does that, usually Ovitrelle or Pregnyl.
How does the Puregon pen work?
The Puregon pen works with a cartridge you place into the pen, after which a dial sets the number of units your clinic prescribed. You inject under the skin, usually in your abdomen or thigh, and hold the needle in place for a few seconds.
One cartridge often lasts several days. You use a new needle each day.
Inject at roughly the same time daily and change the spot, which limits bruising. Store the pen and cartridges as the leaflet describes and ask your pharmacy if you are unsure about storage times.
Puregon or Gonal-f: what difference do you notice?
In outcomes, probably none. Both are recombinant FSH, made in cell lines, and both are given by pen under the skin. A Cochrane review of 42 trials with 9,606 couples found no meaningful difference between recombinant and urinary gonadotrophins in live births or hyperstimulation (PMID 21328276).
The practical difference is in the pen and the units you dose in.
| Puregon | Gonal-f | Menopur | |
|---|---|---|---|
| Active substance | Follitropin beta | Follitropin alfa | Menotrophin |
| Origin | Recombinant | Recombinant | From urine |
| LH activity | No | No | Yes |
| Form | Pen with cartridge | Prefilled pen | Powder and solvent |
| Administration | Under the skin | Under the skin | Under the skin |
| Purpose | Growing follicles, not triggering ovulation |
Which one you get usually depends on your clinic protocol and on what is available. Read also Gonal-f side effects and Menopur and the LH difference.
Side effects of Puregon
The side effects reported most are an injection site reaction, headache, abdominal pain, bloating, nausea and tender breasts. Most come not from the injection itself but from your rising oestradiol.
The Farmacotherapeutisch Kompas also lists ovarian cysts and ovarian hyperstimulation syndrome. That last one is what all the monitoring is aimed at.
Call your clinic if your belly swells quickly, or with severe abdominal pain, nausea with vomiting, shortness of breath or clearly reduced urine output.
For perspective: a Cochrane review on prevention described a baseline risk of roughly 27 percent of moderate or severe hyperstimulation in women at raised risk, falling to about 8 to 14 percent with dopamine agonists (PMID 33851429). Those are figures for the high risk group.
Puregon experiences: what do users report?
The pen gets plenty of praise. Setting the dose is simple, and many women say the first injection is the only nerve wracking moment.
What comes back positively:
- No powder to dissolve, so it is quick
- The dose is clearly readable
- One cartridge lasts several days
- Many women notice little in the first days
What they find difficult:
- A tight belly in the last days before retrieval
- Headache and poorer sleep
- Small bruises if you do not change the injection spot
- The fixed time that steers your day
Picture two women of 31 who start on the same dose. One has ten follicles of similar size after eight days. The other has five, three of which clearly lead, and gets an adjusted dose. The drug is the same, the ovaries are not.
Which values determine your dose?
Your starting dose is mainly set by your age, your AMH and any earlier response to stimulation. AMH best predicts how many follicles you are likely to make.
After that, oestradiol and the scan fine tune it. If oestradiol rises steeply with many follicles, the dose can come down to limit hyperstimulation.
If you want to know your baseline before starting, you can have an AMH test or the IVF blood test, assessed by a BIG-registered doctor. See also AMH value by age and the IVF route from start to finish.
Frequently asked questions
How quickly does Puregon work?
Your follicles respond within a few days, but you notice nothing yourself. The first scan is usually around day 5 to 7. Most women feel something only in the second week, and mainly the bloating.
How much Puregon do you need?
That differs strongly per woman and is set by your clinic. A lower reserve often needs a higher dose, and with many follicles the dose is reduced instead. Always follow the schedule you were given.
Where do you inject Puregon?
Under the skin of your abdomen, roughly a hand width around your navel, or in your thigh. Change the spot daily. Follow the instruction from the clinic.
What if you forget an injection?
Call your clinic, even if it is only a few hours. They decide whether you still inject or adjust the schedule. Never double a dose yourself.
Can you drink alcohol during stimulation?
Most clinics advise limiting or avoiding alcohol during a fertility treatment. No separate interaction with Puregon is known. Discuss it with your treatment team.
I would especially avoid comparing your response with someone else on the same dose. Ten follicles is not better than five if those five are good quality, and the dose that suits you has nothing to do with what you read on a forum. At every scan, ask for two numbers: how many follicles count and what your oestradiol is. That way you follow your own route.
Every blood test result includes a professional assessment from a BIG-registered doctor. For treatment decisions, discuss your results with your GP or your gynaecologist.
References
- Farmacotherapeutisch Kompas. Follitropin beta. Accessed 2026.
- Thuisarts.nl. I am having IVF. Accessed 2026.
- van Wely M, Kwan I, Burt AL, Thomas J, Vail A, Van der Veen F, Al-Inany HG. Recombinant versus urinary gonadotrophin for ovarian stimulation in assisted reproductive technology cycles. Cochrane Database of Systematic Reviews, 2011. PMID 21328276.
- Tang H, Mourad SM, Wang A, Zhai SD, Hart RJ. Dopamine agonists for preventing ovarian hyperstimulation syndrome. Cochrane Database of Systematic Reviews, 2021. PMID 33851429.
- Al-Inany HG, Youssef MA, Ayeleke RO, Brown J, Lam WS, Broekmans FJ. Gonadotrophin-releasing hormone antagonists for assisted reproductive technology. Cochrane Database of Systematic Reviews, 2016. PMID 27126581.
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Dr. Naimi، طبيب مسجل في سجل BIG الهولندي، يشرف على المعايير الطبية لمحتوانا وتقييماتنا. اقرأ سياستنا الطبية
