Minipress Side Effects
Generic Name: prazosin
Medically reviewed by Drugs.com. Last updated on Nov 20, 2020.
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.
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 capsule
Side effects requiring immediate medical attention
Along with its needed effects, prazosin (the active ingredient contained in Minipress) may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention.
Check with your doctor immediately if any of the following side effects occur while taking prazosin:
- Dizziness or lightheadedness, especially when getting up from a lying or sitting position
- fainting (sudden)
- Loss of bladder control
- pounding heartbeat
- swelling of the feet or lower legs
- Chest pain
- trouble breathing
Incidence not known
- Painful or prolonged erection of the penis
Side effects not requiring immediate medical attention
Some side effects of prazosin may occur that usually do not need medical attention. These side effects may go away during treatment as your body adjusts to the medicine. Also, your health care professional may be able to tell you about ways to prevent or reduce some of these side effects.
Check with your health care professional if any of the following side effects continue or are bothersome or if you have any questions about them:
- lack of energy
- Dryness of the mouth
- unusual tiredness or weakness
- Frequent urge to urinate
For Healthcare Professionals
Applies to prazosin: compounding powder, oral capsule
Very common (10% or more): Postural hypotension (up to 14%)
Uncommon (0.1% to 1%): Angina pectoris
Very common (10% or more): Dizziness (up to 10.3%)
Uncommon (0.1% to 1%): Paresthesia, tinnitus
Common (1% to 10%): Lack of energy, weakness, asthenia
Rare (less than 0.1%): Fever, pain
Frequency not reported: Malaise[Ref]
Uncommon (0.1% to 1%): Abdominal discomfort and/or pain
Common (1% to 10%): Depression, nervousness
Uncommon (0.1% to 1%): Insomnia
Rare (less than 0.1%): Hallucinations[Ref]
Common (1% to 10%): Blurred vision, sclera reddened
Uncommon (0.1% to 1%): Eye pain
Common (1% to 10%): Rash
Uncommon (0.1% to 1%): Arthralgia[Ref]
Rare (less than 0.1%): Allergic reaction, positive antinuclear antibody titer[Ref]
Rare (less than 0.1%): Gynecomastia[Ref]
Rare (less than 0.1%): Liver function abnormalities[Ref]
1. Cerner Multum, Inc. "UK Summary of Product Characteristics." O 0
2. "Product Information. Minipress (prazosin)." Pfizer US Pharmaceuticals, New York, NY.
3. Cerner Multum, Inc. "Australian Product Information." O 0
More about Minipress (prazosin)
- During Pregnancy or Breastfeeding
- Dosage Information
- Drug Images
- Drug Interactions
- Pricing & Coupons
- En Español
- 7 Reviews
- Generic Availability
- Drug class: antiadrenergic agents, peripherally acting
Related treatment guides
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.