Midodrin Zentiva (Midodrine Hydrochloride)

Midodrine acts on the autonomic regulation of blood pressure and is indicated for conditions that cause a postural drop in blood pressure.

• Orthostatic hypotension: improves standing systolic pressure and reduces dizziness or fainting.
• Neurogenic orthostatic hypotension: raises blood pressure in patients with autonomic nervous system failure.
• Post‑ural hypotension due to medication side‑effects: counteracts drug‑induced blood‑pressure drops.

• Midodrine is a pro‑drug that is rapidly converted to desglymidodrine, an active metabolite that selectively stimulates peripheral alpha‑1 adrenergic receptors. Activation of these receptors causes vasoconstriction of arterioles and veins, increasing systemic vascular resistance and thereby raising arterial blood pressure, especially when the patient is upright.

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

Common Side Effects

• Piloerection (goose‑flesh) on the arms or torso.
• Itching or skin rash.
• Urinary retention or difficulty voiding.
• Supine hypertension (elevated blood pressure while lying down).

Serious or Rare Side Effects

• Severe hypertension leading to headache or visual disturbances.
• Bradycardia or arrhythmias.
• Allergic reactions such as angioedema or anaphylaxis.
• Myocardial ischemia or infarction in susceptible patients.

Before prescribing Midodrine, clinicians should consider several safety measures.

• Blood pressure monitoring: check supine and standing pressures regularly.
• Supine hypertension: avoid dosing within 4 hours of bedtime.
• Renal impairment: adjust dose or monitor renal function.
• Elderly patients: start with the lowest effective dose and titrate slowly.
• Abrupt discontinuation: taper to reduce rebound hypotension.
• Store at below 25°C: keep in the original pack, protect from moisture.

Midodrine can interact with other agents that affect blood pressure or vascular tone.

Major Interactions (Avoid)

• Monoamine oxidase inhibitors (MAOIs): risk of hypertensive crisis.
• Other antihypertensive drugs (e.g., clonidine, nitroglycerin): additive blood‑pressure lowering.
• Direct vasodilators (e.g., hydralazine): may counteract therapeutic effect.

Moderate Interactions (Monitor Closely)

• Diuretics: may enhance orthostatic blood‑pressure changes.
• Tricyclic antidepressants: possible additive vasoconstriction.
• Selective serotonin reuptake inhibitors (SSRIs): monitor for hypertension.
• Non‑steroidal anti‑inflammatory drugs (NSAIDs): may affect renal handling of the drug.