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Minipress (Prazosin Hydrochloride) - Summary



(prazosin hydrochloride)
For Oral Use

MINIPRESS® (prazosin hydrochloride), a quinazoline derivative, is the first of a new chemical class of antihypertensives.

MINIPRESS (prazosin hydrochloride) is indicated in the treatment of hypertension. It can be used alone or in combination with other antihypertensive drugs such as diuretics or beta adrenergic blocking agents.

See all Minipress indications & dosage >>


Published Studies Related to Minipress (Prazosin)

Efficacy and safety of scorpion antivenom plus prazosin compared with prazosin alone for venomous scorpion (Mesobuthus tamulus) sting: randomised open label clinical trial. [2011.01.05]
OBJECTIVE: Envenomation by Mesobuthus tamulus scorpion sting can result in serious cardiovascular effects. Scorpion antivenom is a specific treatment for scorpion sting. Evidence for the benefit of scorpion antivenom and its efficacy compared with that of commonly used vasodilators, such as prazosin, is scarce. We assessed the efficacy of prazosin combined with scorpion antivenom, compared with prazosin alone, in individuals with autonomic storm caused by scorpion sting... CONCLUSION: Recovery from scorpion sting is hastened by simultaneous administration of scorpion antivenom plus prazosin compared with prazosin alone. TRIAL REGISTRATION NUMBER: CTRI/2010/091/000584 (Clinical Trials Registry India).

Effects of modafinil and prazosin on cognitive and physiological functions in healthy volunteers. [2010.11]
Previous research has demonstrated cognitive-enhancing effects of modafinil in humans and generated evidence for its therapeutic potential in psychiatric disorders... Our findings support the hypothesised involvement of alpha1-adrenoceptors in some of the cognitive-enhancing effects of modafinil and warrant further investigation.

Efficacy of anti-scorpion venom serum over prazosin in the management of severe scorpion envenomation. [2010.10]
BACKGROUND: Scorpion venoms cause a massive release of neurotransmitters. Either anti-scorpion venom serum (AScVS) or prazosin has been used in the management of severe scorpion envenomation. AIMS: To compare the time taken for clinical recovery by patients with severe scorpion envenomation after AScVS therapy with that following prazosin therapy. SETTINGS AND DESIGN: A prospective, open-labeled clinical trial was undertaken to compare the effects of the AScVS and/or prazosin on clinical recovery in scorpion-stung patients... CONCLUSIONS: Intravenous slow bolus of AScVS given based on the clinical severity of envenomation leads to early recovery than prazosin alone and is well tolerated.

Prazosin versus quetiapine for nighttime posttraumatic stress disorder symptoms in veterans: an assessment of long-term comparative effectiveness and safety. [2010.06]
Posttraumatic stress disorder (PTSD) is an anxiety disorder experienced by combat veterans... Because of similar rate of short-term effectiveness, superior long-term effectiveness, and lower incidence of events leading to discontinuation, compared with quetiapine, prazosin should be used first-line for treating nighttime PTSD symptoms in a veteran population.

A pilot trial of the alpha-1 adrenergic antagonist, prazosin, for alcohol dependence. [2009.02]
BACKGROUND: Current medications for alcohol dependence (AD) show only modest efficacy. None target brain noradrenergic pathways. Theory and preclinical evidence suggest that noradrenergic circuits may be involved in alcohol reinforcement and relapse. We therefore tested the alpha-1 adrenergic receptor antagonist, prazosin, as a pharmacotherapy for AD... CONCLUSIONS: Prazosin holds promise as a pharmacologic treatment for AD and deserves further evaluation in a larger controlled trial.

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Clinical Trials Related to Minipress (Prazosin)

Monoamine Antagonist Therapies for Methamphetamine Abuse Prazosin [Recruiting]
This protocol will test the safety, effectiveness and the metabolism and action of prazosin as a potential therapy for methamphetamine abuse. This will be accomplished by performing a series of human laboratory studies. In each of these studies, the safety and effectiveness of the test medication (prazosin) in the treatment of methamphetamine effects will be determined. The study hypothesis is that prazosin will block the methamphetamine receptor function, reducing the reinforcing effects of central nervous system effects in humans.

Augmentation Trial of Prazosin for Post-Traumatic Stress Disorder (PTSD) [Recruiting]
The purpose of this study is to determine whether prazosin will:

- reduce the incidence of nightmares and sleep disturbance

- increase functioning and sense of well being in combat-trauma exposed OIF/OEF veterans.

Prazosin for Treating Noncombat Trauma Post-Traumatic Stress Disorder [Recruiting]
This study will evaluate the effectiveness of prazosin in treating post-traumatic stress disorder caused by noncombat trauma in individuals taking selective serotonin reuptake inhibitors.

CSP #563 - Prazosin and Combat Trauma PTSD (PACT) [Recruiting]
Background: Posttraumatic stress disorder (PTSD) is a debilitating and disabling mental disorder that afflicts at least 25% of veterans who have suffered life-threatening war zone trauma. Trauma-related nightmares and sleep disturbance are among the most treatment-resistant PTSD symptoms in veterans. Increased responsiveness to central nervous system (CNS) norepinephrine (NE) contributes to the pathophysiology of overall PTSD and treatment-resistant nighttime symptoms. Placebo-controlled pilot studies demonstrate that the generically available CNS-active alpha-1 adrenoreceptor antagonist prazosin substantially reduces PTSD trauma nightmares and sleep disturbance and improves global clinical status (sense of well being and ability to function) in veterans.

Objective: The primary objective is to demonstrate in a large multi-site placebo-controlled trial in veterans with war zone trauma-induced PTSD that prazosin is efficacious for PTSD trauma nightmares, sleep disturbance, and global clinical status. A secondary objective is to demonstrate prazosin effectiveness for these outcome measures during clinically meaningful long-term (26 week) maintenance treatment of PTSD. We will also address prazosin efficacy and long-term effectiveness for improving total PTSD symptoms, comorbid depression, quality of life, and physical functioning.

Methods: This 26 week randomized double-blind placebo-controlled study is designed to demonstrate both short term efficacy and long term effectiveness of prazosin for PTSD. The research design encompasses a shorter-term, more tightly controlled efficacy component and a longer-term, more .real world. effectiveness component. Three hundred twenty-six veterans

with war zone - related PTSD and persistent trauma nightmares will be randomized 1: 1 to

prazosin or placebo. Study drug will be increased using a flexible dose titration schedule based on clinical response and adverse effects to an optimum maintenance dose (1-20 mg/day). During the first 10 weeks of the study, participants will be randomized to prazosin or placebo. Previous psychotropic medications and/or psychotherapy will be maintained constant. Short term efficacy will be determined during the first 10 weeks. During the remaining 16 weeks of the 26 week trial, subjects will continue to receive stable-dose double-blind prazosin or placebo, but will have the option to receive additional psychotropic medications and/or psychotherapeutic interventions, as needed, per the judgment of the study Clinician Prescriber. It is hypothesized that prazosin will remain more clinically effective than placebo at the end of the 26-week trial, demonstrating that prazosin adds benefit over-and-above other treatments that are naturalistically administered by providers in a .real world. clinical setting.

Prazosin will be judged efficacious at 10 weeks if superior to placebo on all three primary outcome measures assessing trauma nightmares, sleep disturbance, and global clinical status: the Recurrent Distressing Dreams item of the Clinician Administered PTSD Scale (CAPS), the Pittsburgh Sleep Quality Index (PSQI), and the Clinical Global Impression of Change (CGIC). Secondary outcome measures will assess prazosin effects on total PTSD symptoms, depression, physical functioning, and quality of life. Adverse effects and cardiovascular measures, including supine and standing blood pressure (BP) and heart rate (HR) will be assessed.

Efficacy of Sleep Interventions for Posttraumatic Stress Disorder (PTSD) [Recruiting]
The purpose of this research study is to evaluate and compare the effects of experimental treatments aimed at improving insomnia and nightmares in men and women military veterans between the ages of 18 and 60 years old, and who have a condition called Posttraumatic Stress Disorder. Insomnia refers to difficulty falling or staying asleep, although enough time is allowed for sleeping. Insomnia is also associated with daytime consequences, such as lack of energy, irritability, and difficulty concentrating. Nightmares are bad dreams that may or may not awaken the sleeper, and that cause discomfort during the daytime.

Chronic Posttraumatic Stress Disorder (PTSD) refers to symptoms that occur after someone experienced or witnessed a life-threatening event, and that persist for three months or more after the event. Symptoms include flashbacks, nightmares, feelings of detachment from others, sleep disturbances, irritability, anxiety, and efforts to avoid people and places associated with the life-threatening event. These symptoms occur after a life-threatening event. Symptoms that persist for more than one month indicate the presence of PTSD. In the present study, we will study people with chronic PTSD, which refers to PTSD symptoms that persist for more than 3 months.

Efficacy of a treatment is defined as the capacity to produce the desired effects. In this study, we will evaluate and compare the capacity of two active experimental treatments to reduce insomnia and nightmares associated with PTSD, and one inactive intervention, called a placebo, for people who continue to have sleep difficulties despite receiving treatment with an antidepressant medication called a selective serotonin reuptake inhibitor (SSRI, like Prozac, Paxil, Zoloft, Celexa). The two active experimental treatments are a medication, prazosin, and a brief behavioral intervention, which involves exercises and techniques to reduce nightmares and improve sleep quality. Prazosin is an approved medication by the Food and Drug Administration (FDA) against high blood pressure, but is not FDA-approved for posttraumatic insomnia and nightmares.

more trials >>

Reports of Suspected Minipress (Prazosin) Side Effects

Hypoglycaemia (7)Metabolic Acidosis (7)Toxicity TO Various Agents (7)Intentional Overdose (4)Hypokalaemia (2)Hearing Impaired (2)Tachycardia (1)Fall (1)Chest Pain (1)Hypomagnesaemia (1)more >>

Page last updated: 2011-12-09

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