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Minipress Side Effects

Generic name: prazosin

Medically reviewed by Drugs.com. Last updated on Mar 29, 2022.

Note: This document contains side effect information about prazosin. Some of the dosage forms listed on this page may not apply to the brand name Minipress.

Summary

Common side effects of Minipress include: dizziness. Other side effects include: syncope and drowsiness. See below for a comprehensive list of adverse effects.

For the Consumer

Applies to prazosin: oral capsules

Side effects include:

Dizziness, lightheadedness, headache, drowsiness, lack of energy, weakness, palpitation, nausea.

For Healthcare Professionals

Applies to prazosin: compounding powder, oral capsule

General

The most common adverse reactions were postural hypotension, dizziness, headache, drowsiness, lack of energy, weakness, palpitations, and nausea.[Ref]

Cardiovascular

Very common (10% or more): Postural hypotension (up to 14%)

Common (1% to 10%): Palpitations, tachycardia, orthostatic hypotension

Uncommon (0.1% to 1%): Angina pectoris

Rare (less than 0.1%): Bradycardia, flushing, hypotension, vasculitis

Frequency not reported: Angina exacerbation, myocardial infarction[Ref]

Nervous system

Very common (10% or more): Dizziness (up to 10.3%)

Common (1% to 10%): Drowsiness, headache, faintness, syncope, vertigo

Uncommon (0.1% to 1%): Paresthesia, tinnitus

Rare (less than 0.1%): Narcolepsy worsened[Ref]

Other

Common (1% to 10%): Lack of energy, weakness, asthenia

Rare (less than 0.1%): Fever, pain

Frequency not reported: Malaise[Ref]

Gastrointestinal

Common (1% to 10%): Constipation, diarrhea, dry mouth, nausea, vomiting

Uncommon (0.1% to 1%): Abdominal discomfort and/or pain

Rare (less than 0.1%): Pancreatitis[Ref]

Respiratory

Common (1% to 10%): Dyspnea, nasal congestion, epistaxis[Ref]

Psychiatric

Common (1% to 10%): Depression, nervousness

Uncommon (0.1% to 1%): Insomnia

Rare (less than 0.1%): Hallucinations[Ref]

Ocular

Common (1% to 10%): Blurred vision, sclera reddened

Uncommon (0.1% to 1%): Eye pain

Frequency not reported: Pigmentary mottling, serious retinopathy, cataract development, cataract disappearance[Ref]

Genitourinary

Common (1% to 10%): Urinary frequency, impotence

Rare (less than 0.1%): Incontinence, priapism[Ref]

Dermatologic

Common (1% to 10%): Rash

Uncommon (0.1% to 1%): Diaphoresis, pruritus, urticaria

Rare (less than 0.1%): Alopecia, lichen planus[Ref]

Metabolic

Common (1% to 10%): Edema[Ref]

Musculoskeletal

Uncommon (0.1% to 1%): Arthralgia[Ref]

Immunologic

Rare (less than 0.1%): Allergic reaction, positive antinuclear antibody titer[Ref]

Endocrine

Rare (less than 0.1%): Gynecomastia[Ref]

Hepatic

Rare (less than 0.1%): Liver function abnormalities[Ref]

References

1. "Product Information. Minipress (prazosin)." Pfizer U.S. Pharmaceuticals (2001):

2. Cerner Multum, Inc. "UK Summary of Product Characteristics." O 0

3. Cerner Multum, Inc. "Australian Product Information." O 0

Further information

Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.

Some side effects may not be reported. You may report them to the FDA.