Protirelin
Also known as: Lopremone, pGlu-His-Pro-NH2, Protirelin, Relefact TRH, Thypinone, Thyrotropin-releasing hormone, Thyrotropin‑releasing hormone, TRH
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Summary
Protirelin (TRH) is a synthetic tripeptide hormone used primarily for diagnostic testing of pituitary‑thyroid axis function; it is not approved for chronic therapeutic use.
Mechanism of Action
Agonist at thyrotropin-releasing hormone (TRH) receptors on anterior pituitary, stimulating Gq‑protein signaling that increases release of thyroid‑stimulating hormone (TSH) and prolactin; also modulates central nervous system activity.
Routes of Administration
Goals & Uses
- Diagnostic assessment of pituitary TSH reserveEndocrine DiagnosticsHigh
- Differentiation of hypothalamic vs. pituitary hypothyroidismEndocrine DiagnosticsHigh
- Neuroprotection / CNS disorders (investigational)NeurologyLow
- Prolactin secretion assessmentEndocrine DiagnosticsModerate
- Pituitary‑thyroid axis diagnostic testingDiagnosticHigh
Contraindications
- Known hypersensitivity to protirelinAllergy/ImmunologyHigh
- HyperthyroidismEndocrineHigh
- Seizure disordersNeurologyModerate
- Coronary artery disease (unstable)CardiovascularHigh
- Severe hypertensionCardiovascularModerate
- Myocardial infarction (recent)CardiovascularHigh
Adverse Effects
- Urge to urinateUrologicalCommon
- HeadacheNeurologicUncommonPain in the head or upper neck
- Transient hypertensionCardiovascularUncommon
- HypotensionCardiovascularRareLow blood pressure
- FlushingVascularCommonWarmth and redness of the skin
- NauseaGastrointestinalCommonFeeling of sickness or urge to vomit
- Flushing / warmth sensationVascularCommon
- Anxiety / lightheadednessNeurologicalUncommon
Drug Interactions
- Dopamine agonists (e.g., levodopa, bromocriptine)Moderate
- Antihypertensive agentsModerate
- CorticosteroidsModerate
- Antidepressants (tricyclics, SSRIs)Low
- Levothyroxine / thyroid hormoneHigh
Population Constraints
- PregnancyReproductive SafetyRelative
- Elderly patients with cardiovascular diseaseCardiovascularRelative
- Pediatric patientsAgeRelative
- Patients with adrenal insufficiencyEndocrineRelative
- Pregnant womenReproductiveRelative
Regulatory Status
- European UnionUnapprovedNot authorized for therapeutic use in the European Union.
- United StatesUnapprovedAvailable only for research and limited diagnostic use; not FDA‑approved as a drug.
- United KingdomUnapprovedNo marketing authorisation; used off‑label for diagnostic testing.
Not approved as a therapeutic agent in major jurisdictions; available as a research chemical and for limited diagnostic applications.
Evidence & Sources
No sources recorded yet.
Frequently Asked Questions
What is Protirelin?
Protirelin (TRH) is a synthetic tripeptide hormone used primarily for diagnostic testing of pituitary‑thyroid axis function; it is not approved for chronic therapeutic use.
What is Protirelin used for?
Protirelin is educationally associated with: Diagnostic assessment of pituitary TSH reserve, Differentiation of hypothalamic vs. pituitary hypothyroidism, Neuroprotection / CNS disorders (investigational), Prolactin secretion assessment, Pituitary‑thyroid axis diagnostic testing. Educational only — not medical advice.
How is Protirelin administered?
Recorded routes of administration: Intravenous, Subcutaneous.
What are the potential side effects of Protirelin?
Reported adverse effects include: Urge to urinate, Headache, Transient hypertension, Hypotension, Flushing, Nausea, Flushing / warmth sensation, Anxiety / lightheadedness. This list is not exhaustive — consult a qualified clinician.
Who should avoid Protirelin?
Recorded contraindications: Known hypersensitivity to protirelin, Hyperthyroidism, Seizure disorders, Coronary artery disease (unstable), Severe hypertension, Myocardial infarction (recent). Consult a qualified clinician before use.