prazosin and midodrine hydrochloride: label evidence and limits

The midodrine hydrochloride label names prazosin among alpha-adrenergic blocking agents that can oppose midodrine’s effects.

Which products this evidence covers

Oral midodrine hydrochloride tablets.

What this finding does and does not establish

The label supports antagonism of effect. It does not assign CDI’s major category or establish how either medicine should be changed for an individual patient.

Supporting label passage

Drug Interactions: When administered concomitantly with midodrine hydrochloride, cardiac glycosides may enhance or precipitate bradycardia, A.V. block or arrhythmia. The risk of hypertension increases with concomitant administration of drugs that increase blood pressure (phenylephrine, pseudoephedrine, ephedrine, dihydroergotamine, thyroid hormones, or droxidopa). Avoid concomitant use of drugs that increase blood pressure. If concomitant use cannot be avoided, monitor blood pressure closely. Avoid use of MAO inhibitors or linezolid with midodrine. Midodrine hydrochloride has been used in patients concomitantly treated with salt-retaining steroid therapy (i.e., fludrocortisone acetate), with or without salt supplementation. The potential for supine hypertension should be carefully monitored in these patients and may be minimized by either reducing the dose of fludrocortisone acetate or decreasing the salt intake prior to initiation of treatment with midodrine hydrochloride. Alpha-adrenergic blocking agents, such as prazosin, terazosin, and doxazosin, can antagonize the effects of midodrine hydrochloride.

Read the product label on DailyMed. Section: Drug Interactions. Compared label version 13, dated 2026-08-20.

How this brief was prepared

This brief uses an AI-assisted source comparison dated 2026-10-16. The label version and supporting passage were checked again on 2026-10-31. Independent clinical review has not been recorded. The comparison does not validate CDI's severity category or determine individual treatment.

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