Midodrine Hydrochloride Morningside Healthcare (Midodrine Hydrochloride)

Midodrine is an Alpha‑1 adrenergic agonist used to treat conditions characterized by low blood pressure upon standing.

• Orthostatic hypotension: Increases standing systolic pressure to reduce dizziness, light‑headedness and syncope.
• Neurogenic orthostatic hypotension: Improves vascular tone in patients with autonomic failure, helping maintain upright blood pressure.

• Midodrine is converted in vivo to its active metabolite, desglymidodrine, which selectively stimulates peripheral alpha‑1 adrenergic receptors. Activation of these receptors causes arteriolar and venous vasoconstriction, raising systemic vascular resistance and thereby increasing arterial blood pressure without significant direct cardiac effects.

Midodrine may cause a range of adverse reactions, most of which are related to its vasoconstrictive action.

Common Side Effects

• Piloerection: Localized goose‑flesh skin reaction.
• Pruritus: Itching, often on the torso.
• Urinary retention: Difficulty emptying the bladder.
• Supine hypertension: Elevated blood pressure while lying down.
• Headache: Pressure‑type headache.
• Paresthesia: Tingling sensations in extremities.

Serious or Rare Side Effects

• Severe hypertension: Marked rise in blood pressure requiring medical intervention.
• Bradycardia: Unusually slow heart rate.
• Cardiac arrhythmias: Irregular heart rhythms.
• Ischemic events: Chest pain or myocardial ischemia.
• Peripheral ischemia: Reduced blood flow to limbs causing pain or discoloration.

Before prescribing Midodrine, clinicians should evaluate patient‑specific risk factors and monitor therapy closely.

• Blood pressure monitoring: Check supine and standing pressures to avoid excessive hypertension.
• Supine positioning: Advise patients to remain upright for at least 4 hours after dosing.
• Renal impairment: Adjust dose or monitor closely in patients with reduced kidney function.
• Concomitant antihypertensives: Review other blood‑pressure‑lowering agents to prevent additive effects.
• Cardiovascular disease: Use caution in patients with coronary artery disease or heart failure.
• Store at room temperature: Keep below 25 °C in the original container, protected from moisture and direct sunlight.

Midodrine can interact with several drug classes, altering its efficacy or safety profile.

Major Interactions (Avoid)

• Monoamine oxidase inhibitors (MAOIs): Combined use may cause hypertensive crises.
• Other vasopressors (e.g., phenylephrine): Additive pressor effects can lead to severe hypertension.

Moderate Interactions (Monitor Closely)

• Diuretics: May enhance orthostatic hypotension when used together.
• Antihypertensive agents (ACE inhibitors, ARBs, beta‑blockers): May blunt the intended pressor response.
• Tricyclic antidepressants and SSRIs: Potential for increased blood pressure variability.