Triptorelin Acetate is a synthetic decapeptide analog of gonadotropin-releasing hormone (GnRH or LHRH). It is used primarily in medicine to regulate hormone production and manage hormone-sensitive conditions.
Mechanism of Action
Triptorelin works by initially stimulating the pituitary gland to release luteinizing hormone (LH) and follicle-stimulating hormone (FSH). However, with continuous use, it leads to downregulation of GnRH receptors, which eventually suppresses LH and FSH secretion — reducing testosterone in men and estrogen in women. This hormonal suppression mimics a chemical castration effect.
Medical Uses
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Prostate Cancer (advanced or metastatic)
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Triptorelin reduces testosterone, which helps slow or stop cancer growth.
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Endometriosis
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Reduces estrogen levels to relieve pain and inflammation.
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Uterine Fibroids
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Helps shrink fibroids and reduce related symptoms.
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Precocious Puberty
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Delays early onset of puberty by suppressing hormone release.
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Fertility Treatment (Assisted Reproduction)
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Used to control hormonal cycles and prevent premature ovulation.
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Dosage Forms
Triptorelin is available as:
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Injectable powder (Triptorelin Acetate)
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Sustained-release depot injections (monthly, 3-month, or 6-month formulations)
Common Brand Names
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Decapeptyl®
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Trelstar®
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Gonapeptyl®
Dosage Guidelines
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Varies depending on the condition.
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Typically administered intramuscularly or subcutaneously.
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For prostate cancer: 3.75 mg every 4 weeks or 11.25 mg every 3 months (depot form).
Side Effects
Initial “flare” effects:
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Temporary increase in testosterone or estrogen before suppression.
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Can cause a temporary worsening of symptoms (e.g., bone pain in prostate cancer).
Common Side Effects:
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Hot flashes
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Decreased libido
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Erectile dysfunction (men)
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Vaginal dryness (women)
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Mood changes
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Headaches
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Injection site irritation
Long-Term Use Risks:
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Bone density loss (osteoporosis)
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Hormonal imbalances
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Fatigue or metabolic changes
Bodybuilding & Off-Label Use
While Triptorelin is not approved for bodybuilding, it has been explored off-label in post-cycle therapy (PCT) to restart natural testosterone production after anabolic steroid use. However, this use is not medically recommended and carries risks due to its potent hormonal effects.
Precautions & Contraindications
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Not for use during pregnancy or breastfeeding.
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Caution in patients with cardiovascular disease, depression, or bone density issues.
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Should only be administered under medical supervision.
Legal Status
Triptorelin is a prescription-only medication in most countries and regulated due to its strong hormonal effects.