Metycor (Metyrapone)

Metycor acts on adrenal steroid synthesis pathways and is employed in endocrine disorder management and diagnostic evaluation.

• Cushing's syndrome: lowers excess cortisol levels to improve clinical symptoms.
• Diagnostic testing for adrenal insufficiency: blocks cortisol synthesis to assess adrenal reserve.
• Pre‑operative assessment of adrenal function: helps evaluate cortisol production before surgery.

• Metyrapone selectively inhibits the enzyme 11‑beta‑hydroxylase in the adrenal cortex, preventing the final step of cortisol biosynthesis. By blocking this conversion, the drug reduces circulating cortisol concentrations while allowing accumulation of precursor steroids, which can be measured for diagnostic purposes.

Metycor may cause a range of adverse reactions, which are categorized by frequency.

Common Side Effects

• Nausea: mild to moderate gastrointestinal upset.
• Headache: transient cranial discomfort.
• Dizziness: occasional light‑headedness.
• Fatigue: reduced energy levels.
• Abdominal pain: intermittent discomfort.
• Vomiting: occasional emesis.

Serious or Rare Side Effects

• Adrenal insufficiency: severe cortisol deficiency requiring medical attention.
• Hypertension: elevated blood pressure episodes.
• Hypokalemia: low potassium levels that may cause muscle weakness.
• Allergic reactions: rash, pruritus, or anaphylaxis.
• Liver enzyme elevation: increased transaminases indicating hepatic stress.
• Seizures: rare neurologic events.

Before initiating Metycor, clinicians should consider several safety measures.

• Monitor cortisol levels: assess hormonal response regularly.
• Assess electrolyte balance: watch for potassium disturbances.
• Evaluate blood pressure: detect hypertension or hypotension.
• Review hepatic function: check liver enzymes periodically.
• Avoid abrupt discontinuation: taper under medical supervision.
• Store at room temperature: keep in the original container, protect from moisture.

Metycor can interact with other medications that affect steroid metabolism or electrolyte balance.

Major Interactions (Avoid)

• Ketoconazole: combined inhibition of cortisol synthesis may cause severe adrenal suppression.
• Rifampin: enzyme induction can reduce Metyrapone effectiveness.
• Phenobarbital: hepatic enzyme induction may lower drug levels.

Moderate Interactions (Monitor Closely)

• Oral contraceptives: altered hormone levels may require dose adjustment.
• Antihypertensives: blood pressure changes may need closer monitoring.