Metopirone

Metyrapone, the active ingredient in Metopirone, is a 11β-hydroxylase inhibitor presented as a tablet for oral use. It reduces cortisol synthesis and is used in diagnostic testing for Cushing's syndrome and in managing adrenal insufficiency.

GNH USA supplies Metopirone as a licensed, GDP-compliant international pharmaceutical supplier serving hospitals, pharmacies and clinics worldwide.

Metopirone acts on the adrenal cortisol synthesis pathway and is employed in specific endocrine evaluations.

- Cushing's syndrome (diagnostic testing): helps assess endogenous cortisol production and the integrity of the hypothalamic‑pituitary‑adrenal axis. - Adrenal insufficiency (functional assessment): used to evaluate residual adrenal reserve and guide therapeutic decisions. - ACTH stimulation testing (adrenal reserve evaluation): provokes cortisol response to determine adrenal gland responsiveness.

Metopirone may cause a range of adverse reactions, from mild to severe.

Common Side Effects: - Nausea - Headache - Dizziness - Fatigue - Abdominal pain - Vomiting

Serious or Rare Side Effects: - Adrenal crisis - Severe hypotension - Allergic reactions (rash, anaphylaxis) - Hepatic dysfunction - Hyponatremia - Hypoglycemia

When using Metopirone, several safety considerations are recommended.

- Monitor cortisol levels: regular testing is needed to avoid excessive suppression. - Adjust in hepatic impairment: reduced metabolism may increase exposure. - Cardiovascular caution: patients with unstable blood pressure may be more vulnerable to hypotension. - Avoid abrupt discontinuation: tapering may be required to prevent adrenal insufficiency. - Contraindication: known hypersensitivity to metyrapone or tablet excipients. - Store at ambient temperature: keep below 25°C in the original pack, protect from moisture.

Metopirone can interact with several medications that affect steroid metabolism.

Major Interactions (Avoid): - Ketoconazole: potent CYP inhibition may increase metyrapone levels. - Rifampicin: strong enzyme induction can markedly reduce efficacy. - Oral contraceptives: may alter cortisol dynamics and affect test results. - Phenytoin: enzyme induction may diminish drug effect.

Moderate Interactions (Monitor Closely): - SSRIs (e.g., fluoxetine): may influence ACTH and cortisol feedback. - NSAIDs: can mask fever or pain related to adrenal crisis. - Antihypertensives: concurrent hypotensive effects may require dose adjustment.