ReproductiveFDA Approved

Nafarelin (Synarel)

Intranasal

Overview

Nafarelin is a synthetic decapeptide analogue of gonadotropin-releasing hormone (GnRH) with substitutions at positions 6 and 10 that enhance receptor affinity and metabolic stability. Chronic administration leads to downregulation of pituitary GnRH receptors and suppression of gonadotropin secretion, resulting in a hypoestrogenic state.

Mechanism of Action

This mechanism is therapeutically exploited in conditions requiring ovarian suppression, including endometriosis and central precocious puberty..

Research Summary & Key Findings

FDA approval was granted in 1990 for the treatment of endometriosis based on randomized controlled trials demonstrating reduction in endometrial implants and pain symptoms. Subsequent approval for central precocious puberty followed from studies showing suppression of pubertal progression and improved adult height predictions. The agent has largely been supplanted by longer-acting GnRH analogues in clinical practice.

Clinical Status

FDA Approved

Nafarelin (Synarel) has received FDA approval and is available for clinical use under appropriate medical supervision. Consult a qualified healthcare provider for prescribing information.

Administration Routes

Intranasal

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Disclaimer: This information is provided for educational and research purposes only. It is not intended as medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider before starting any peptide therapy. The Peptide Association does not endorse or recommend any specific treatment protocol.