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.
Adult dose
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.
- National Early Warning Score 2 (NEWS2) · Early Warning
- Modified Early Warning Score (MEWS) · Early Warning
- NEWS2 Score · Early Warning
- Modified Early Warning Score · Early Warning
- CARING Criteria for Palliative Care Referral · Prognostication
- IPSS (International Prostate Symptom Score) · Benign Prostatic Hyperplasia