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Title: Nafarelin  
Author: World Heritage Encyclopedia
Language: English
Subject: Gonadotropin-releasing hormone agonist, Ganirelix, ATC code H01, Antigonadotropin, Relugolix
Publisher: World Heritage Encyclopedia


Systematic (IUPAC) name
Clinical data
Trade names Synarel
Pregnancy cat.
  • X
Legal status
  • ℞-only
Routes Nasal spray
Pharmacokinetic data
Half-life 2.6 to 4 hours
Excretion renal
CAS number  YesY
ATC code H01
ChemSpider  YesY
Chemical data
Formula C66H83N17O13 
Mol. mass 1321.6344 g/mol

Nafarelin is a gonadotropin-releasing hormone agonist (GnRH agonist). By causing constant stimulation of the pituitary gland, it decreases pituitary secretion of the gonadotropins luteinizing hormone (LH) and follicle stimulating hormone (FSH). Nafarelin may be used in the treatment of estrogen-dependent conditions (such as endometriosis or uterine fibroids), to treat central precocious puberty, or to control ovarian stimulation in IVF.

Nafarelin acetate is marketed by Searle (now part of Pfizer) under the brand name Synarel. It is delivered via a nasal spray.

Side effects

Side effects of nafarelin are related to the low estrogen state. Side effects include hot flashes, vaginal dryness, headaches, mood changes, and decreased interest in sex. Some patients may experience acne, muscle pain, reduced breast size, and irritation of the tissue inside the nose. These side effects are reversible and should resolve after stopping the medication.[1]


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