Does Novarel Trigger Ovulation?
Yes, Novarel (chorionic gonadotropin injection, or hCG) induces final follicular maturation and ovulation in women undergoing infertility treatment. It mimics the luteinizing hormone (LH) surge, prompting egg release from the ovary within 38-40 hours after administration.[1][2]
How Is Novarel Used in Fertility Treatments?
Doctors prescribe Novarel in assisted reproduction protocols like IVF or IUI. It's injected after ovarian stimulation with drugs like FSH to develop follicles. A typical dose is 5,000-10,000 IU intramuscularly or subcutaneously, timed when follicles reach 16-20 mm via ultrasound.[1][3] It supports ovulation but requires prior follicle growth from other meds.
What Happens After a Novarel Trigger Shot?
Ovulation occurs predictably 36-42 hours post-injection, confirmed by ultrasound or LH kits. Timing intercourse, IUI, or egg retrieval follows. Progesterone supplementation often starts afterward to support the luteal phase and implantation.[2][4]
Success Rates and Effectiveness
In IVF cycles, Novarel triggers ovulation in over 90% of cases with mature follicles, leading to egg retrieval yields of 10-15 eggs on average. Success depends on age, follicle count, and underlying infertility cause—live birth rates range 20-50% per cycle for women under 35.[3][5] Studies show no major difference in outcomes versus recombinant hCG like Ovidrel.
Common Side Effects and Risks
Mild reactions include injection site pain, headache, or nausea. Risks include ovarian hyperstimulation syndrome (OHSS, 1-5% severe cases with bloating, pain, or fluid buildup) and multiple pregnancies (10-30% risk). Ectopic pregnancy rates match non-hCG cycles. Monitor via ultrasound; avoid if ovarian cysts or thyroid issues exist.[1][2]
Novarel vs. Other Ovulation Triggers
| Trigger | Active Ingredient | Dose/Form | Key Difference |
|---------|-------------------|-----------|---------------|
| Novarel | Urinary hCG | 5k-10k IU injection | Cheaper, widely available; slight impurity risk |
| Ovidrel | Recombinant hCG | 250 mcg subQ | Purified, fixed dose; lower OHSS risk |
| Lupron | GnRH agonist | 1-4 mg | "Mild trigger" for high responders; reduces OHSS but lowers retrieval yield |
Novarel costs $50-150 per vial (generic); Ovidrel is pricier at $100-200.[4][6]
Who Shouldn't Use Novarel?
Contraindicated in pregnancy, hormone-dependent cancers, uncontrolled thyroid/adrenal issues, or recent pituitary tumors. Not for anovulatory conditions without stimulation.[1]
[1]: Novarel Prescribing Information (FDA label)
[2]: ASRM Practice Committee Guidelines on Ovulation Induction
[3]: Fertility and Sterility Journal Review on hCG Triggers
[4]: Drugs.com - Novarel Overview
[5]: CDC ART Success Rates 2021
[6]: GoodRx Pricing Comparison