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Gonadotrophin (Ovulation Trigger) Pregnancy: There is no indication for the use of Ovitrelle during pregnancy. Data on a limited number of exposed pregnancies indicate no increased risks of malformation or foeto/neonatal toxicity; no reproduction studies with choriogonadotropin alfa were performed in animals and the potential risk for humans is unknown. Ovitrelle is not indicated during breastfeeding and there are no data on the excretion of choriogonadotropin alfa in milk. Ovitrelle is indicated for use in infertility.

Human Chorionic Gonadotrophin (hCG)

Brand names: Ovitrelle (choriogonadotropin alfa), Pregnyl (urinary hCG)

Human chorionic gonadotrophin is a gonadotrophin used in assisted reproduction to trigger final oocyte maturation and ovulation, and in the treatment of certain hypogonadotrophic and fertility disorders.

Auto-extracted from the source labelling — not yet independently clinician-verified. These values were distilled from the UK SPC (or the US label where noted) but have not had a clinician sign-off. Confirm against the current SmPC before prescribing.

Adult dose

Dose: SCOPE - Ovitrelle (recombinant choriogonadotropin alfa) ONLY. Ovulation trigger, i.e. induction of final follicular maturation and luteinisation: one pre-filled pen of Ovitrelle, 250 micrograms in 0.5 mL, as a single dose. In women undergoing superovulation prior to assisted reproductive technologies (ART) such as in vitro fertilisation (IVF) it is administered 24 to 48 hours after the last administration of a follicle stimulating hormone (FSH) or human menopausal gonadotropin (hMG) preparation, i.e. when optimal stimulation of follicular growth is achieved; in anovulatory or oligo-ovulatory women it is administered 24 to 48 hours after optimal stimulation of follicular growth is achieved. This dose does NOT cover the Pregnyl (urinary hCG) intramuscular regimen that is also named on this page - no Pregnyl source is present in the bundle, and urinary hCG is dosed in international units, not micrograms
Route: Subcutaneous injection. Ovitrelle is for single use only. Self-administration should only be performed by patients who are adequately trained and have access to expert advice
Frequency: A single dose per treatment cycle, given 24 to 48 hours after the last FSH or hMG administration, or 24 to 48 hours after optimal stimulation of follicular growth is achieved. The patient is recommended to have coitus on the day of, and the day after, the Ovitrelle injection
Max: 250 micrograms - the SPC states 'The maximum dose is 250 micrograms'
Treatment with Ovitrelle should be performed under the supervision of a physician experienced in the treatment of fertility problems. Before starting treatment the couple's infertility should be assessed as appropriate and putative contraindications for pregnancy evaluated; in particular, patients should be evaluated for hypothyroidism, adrenocortical deficiency, hyperprolactinaemia and pituitary or hypothalamic tumours, and appropriate specific treatment given. There is no clinical experience with Ovitrelle in the treatment of other conditions (such as corpus luteum insufficiency or male conditions) and it is not indicated in these conditions. OHSS: adherence to the recommended dosage and regimen can minimise the risk of ovarian hyperstimulation; there is evidence that hCG plays a key role in triggering OHSS and that the syndrome may be more severe and more protracted if pregnancy occurs, so if signs of ovarian hyperstimulation occur it is recommended that hCG be withheld and the patient advised to refrain from coitus or to use barrier contraceptive methods for at least 4 days. Independent risk factors for OHSS include young age, lean body mass, polycystic ovarian syndrome, higher doses of exogenous gonadotropins, high absolute or rapidly rising serum estradiol levels, previous episodes of OHSS, a large number of developing follicles and a large number of oocytes retrieved in ART cycles. Safety, efficacy and pharmacokinetics in renal or hepatic impairment have not been established. Traceability: record the name and batch number of the administered product. SPC section 4.4 was truncated at the source-fetch limit, so the warnings summarised here are not complete.

Dose auto-extracted from UK Summary of Product Characteristics (SPC) via the eMC — not yet clinician-verified. Always confirm against the product SmPC and your local formulary before prescribing.

Contraindications

  • Hypersensitivity to the active substance or to any of the excipients
  • Tumours of the hypothalamus or pituitary gland
  • Ovarian enlargement or cyst unrelated to polycystic ovarian syndrome
  • Gynaecological haemorrhages of unknown aetiology
  • Ovarian, uterine or mammary carcinoma
  • Active thromboembolic disorders
  • Must not be used where an effective response cannot be obtained: primary ovarian failure; malformations of sexual organs incompatible with pregnancy; fibroid tumours of the uterus incompatible with pregnancy; postmenopausal women

Side effects

  • Ovarian hyperstimulation syndrome (OHSS) - mild or moderate OHSS is common and severe OHSS is uncommon; in comparative trials OHSS was associated with Ovitrelle in a dose-related fashion, observed in approximately 4% of patients treated, with severe OHSS reported in less than 0.5%
  • Common: headache
  • Common: abdominal pain, abdominal distension, nausea, vomiting; uncommon: abdominal discomfort, diarrhoea
  • Common: injection site reactions
  • Very rare: mild to severe hypersensitivity reactions including rash, anaphylactic reactions and shock
  • Very rare: thromboembolism, both in association with and separate from OHSS

Monitoring

  • Monitoring of stimulation cycles by ultrasound scans as well as estradiol measurements is recommended, to identify risk factors for OHSS early
  • Withhold hCG if signs of ovarian hyperstimulation occur, and advise the patient to refrain from coitus or to use barrier contraception for at least 4 days
  • Be alert to severe OHSS, which may very rarely be complicated by ovarian torsion or thromboembolic events such as pulmonary embolism, ischaemic stroke or myocardial infarction; clinical evaluation may reveal hypovolaemia, haemoconcentration, electrolyte imbalance, ascites, pleural effusions or acute pulmonary distress
  • Record the product name and batch number for traceability of this biological medicine

Clinical monograph

How it works

It mimics luteinising hormone by acting on LH/hCG receptors, inducing final follicular maturation and ovulation and supporting corpus luteum progesterone production.

Prescribing in practice

  • Administering the trigger can precipitate or worsen ovarian hyperstimulation syndrome, so it must be used under specialist supervision with careful response assessment.
  • Multiple pregnancy risk is increased and timing of the trigger relative to oocyte retrieval is critical.
  • hCG can interfere with pregnancy testing for a period after administration; exclude relevant tumours before use.

Monitoring

Assess follicular maturity by ultrasound before triggering and watch for features of ovarian hyperstimulation afterwards.

Counselling the patient

  • The timing of this injection is important for your treatment cycle, so follow instructions precisely.
  • Report abdominal swelling, pain, breathlessness or reduced urine output promptly.
  • A pregnancy test soon after the injection may be misleading, so test only when advised.

Evidence & guidelines

hCG triggering of final oocyte maturation is standard practice within NICE-supported assisted reproduction protocols.

Reference: ESHRE ART Guidelines; NICE CG156; Drug verified in RxNorm (NLM); confirm dosing against the manufacturer SPC (eMC). Verify against your local formulary and current prescribing references before prescribing. The structured dose values shown have been reviewed by a clinician. Monograph status: clinician-reviewed (2026-07-04).

Related

Curated clinical cross-links plus same-class fallbacks.