Prazosin Hcl
Generic Name: prazosin hcl
Brand Names:
Prazosin Hcl
Prazosin hydrochloride USP, a quinazoline derivative, is the first of a new chemical class of antihypertensives. It is the hydrochloride salt of 1-(4-amino-6,7-dimethoxy 2-quinazolinyl)-4-(2-furoyl) piperazine and its structural formula is: [Chemical Structure] Molecular Formula: C19H21N5O4•HCl It is white to tan powder, slightly soluble in water, in methanol, in dimethyl formamide, in dimethyl acetamide, very slightly soluble in alcohol, practically insoluble in isotonic saline, in chloroform a...
Overview
Prazosin hydrochloride USP, a quinazoline derivative, is the first of a new chemical class of antihypertensives. It is the hydrochloride salt of 1-(4-amino-6,7-dimethoxy 2-quinazolinyl)-4-(2-furoyl) piperazine and its structural formula is: [Chemical Structure] Molecular Formula: C19H21N5O4•HCl It is white to tan powder, slightly soluble in water, in methanol, in dimethyl formamide, in dimethyl acetamide, very slightly soluble in alcohol, practically insoluble in isotonic saline, in chloroform a...
Uses
Prazosin hydrochloride capsules are indicated for the treatment of hypertension, to lower blood pressure. Lowering blood pressure reduces the risk of fatal and nonfatal cardiovascular events, primarily strokes and myocardial infarctions. These benefits have been seen in controlled trials of antihypertensive drugs from a wide variety of pharmacologic classes, including this drug. Control of high blood pressure should be part of comprehensive cardiovascular risk management, including, as appropriate, lipid control, diabetes management, antithrombotic therapy, smoking cessation, exercise, and limited sodium intake. Many patients will require more than one drug to achieve blood pressure goals.
Dosage
The dose of prazosin hydrochloride capsules should be adjusted according to the patient's individual blood pressure response. The following is a guide to its administration: Initial Dose 1 mg two or three times a day (see WARNINGS.) Maintenance Dose Dosage may be slowly increased to a total daily dose of 20 mg given in divided doses. The therapeutic dosages most commonly employed have ranged from 6 mg to 15 mg daily given in divided doses. Doses higher than 20 mg usually do not increase efficacy, however a few patients may benefit from further increases up to a daily dose of 40 mg given in divided doses. After initial titration some patients can be maintained adequately on a twice daily dosage regimen.
Side Effects
Clinical trials were conducted on more than 900 patients. During these trials and subsequent marketing experience, the most frequent reactions associated with prazosin hydrochloride capsules therapy are: dizziness 10.3%, headache 7.8%, drowsiness 7.6%, lack of energy 6.9%, weakness 6.5%, palpitations 5.3%, and nausea 4.9%. In most instances, side effects have disappeared with continued therapy or have been tolerated with no decrease in dose of drug. Less frequent adverse reactions which are reported to occur in 1–4% of patients are: Gastrointestinal: vomiting, diarrhea, constipation. Cardiovascular: edema, orthostatic hypotension, dyspnea, syncope. Central Nervous System: vertigo, depression, nervousness. Dermatologic: rash. Genitourinary: urinary frequency.
Warnings
As with all alpha-blockers, prazosin hydrochloride capsules may cause syncope with sudden loss of consciousness. In most cases, this is believed to be due to an excessive postural hypotensive effect, although occasionally the syncopal episode has been preceded by a bout of severe tachycardia with heart rates of 120–160 beats per minute. Syncopal episodes have usually occurred within 30 to 90 minutes of the initial dose of the drug; occasionally, they have been reported in association with rapid dosage increases or the introduction of another antihypertensive drug into the regimen of a patient taking high doses of prazosin hydrochloride capsules. The incidence of syncopal episodes is approximately 1% in patients given an initial dose of 2 mg or greater. Prazosin hydrochloride capsules are contraindicated in patients with known sensitivity to quinazolines, prazosin, or any of the inert ingredients.
Storage
Prazosin Hydrochloride Capsules, USP are available containing prazosin hydrochloride, USP equivalent to 1 mg, 2 mg, or 5 mg of prazosin. The 1 mg capsule is White opaque cap/ white opaque body, hard gelatin capsule imprinted with [Image] on cap and "429" on body with black ink containing white to off white powder. They are available as follows: NDC 70756-429-11 bottles of 100 capsules.
Frequently Asked Questions
What is Prazosin Hcl used for?▼
Prazosin hydrochloride capsules are indicated for the treatment of hypertension, to lower blood pressure. Lowering blood pressure reduces the risk of fatal and nonfatal cardiovascular events, primarily strokes and myocardial infarctions. These benefits have been seen in controlled trials of antihypertensive drugs from a wide variety of pharmacologic classes, including this drug. Control of high blood pressure should be part of comprehensive cardiovascular risk management, including, as appropriate, lipid control, diabetes management, antithrombotic therapy, smoking cessation, exercise, and limited sodium intake. Many patients will require more than one drug to achieve blood pressure goals.
What are the side effects of Prazosin Hcl?▼
Clinical trials were conducted on more than 900 patients. During these trials and subsequent marketing experience, the most frequent reactions associated with prazosin hydrochloride capsules therapy are: dizziness 10.3%, headache 7.8%, drowsiness 7.6%, lack of energy 6.9%, weakness 6.5%, palpitations 5.3%, and nausea 4.9%. In most instances, side effects have disappeared with continued therapy or have been tolerated with no decrease in dose of drug. Less frequent adverse reactions which are reported to occur in 1–4% of patients are: Gastrointestinal: vomiting, diarrhea, constipation. Cardiovascular: edema, orthostatic hypotension, dyspnea, syncope. Central Nervous System: vertigo, depression, nervousness. Dermatologic: rash. Genitourinary: urinary frequency.
What are the important warnings for Prazosin Hcl?▼
As with all alpha-blockers, prazosin hydrochloride capsules may cause syncope with sudden loss of consciousness. In most cases, this is believed to be due to an excessive postural hypotensive effect, although occasionally the syncopal episode has been preceded by a bout of severe tachycardia with heart rates of 120–160 beats per minute. Syncopal episodes have usually occurred within 30 to 90 minutes of the initial dose of the drug; occasionally, they have been reported in association with rapid dosage increases or the introduction of another antihypertensive drug into the regimen of a patient taking high doses of prazosin hydrochloride capsules. The incidence of syncopal episodes is approximately 1% in patients given an initial dose of 2 mg or greater. Prazosin hydrochloride capsules are contraindicated in patients with known sensitivity to quinazolines, prazosin, or any of the inert ingredients.
Related Medications
L-histidine High
l-histidine high
*Claims based on traditional homeopathic practice, not accepted medical evidence. Not FDA evaluated.
Fluticasone Propionate And Salmeterol Xinafoate
fluticasone propionate and salmeterol xinafoate
11 DESCRIPTION ADVAIR HFA 45 mcg/21 mcg, ADVAIR HFA 115 mcg/21 mcg, and ADVAIR HFA 230 mcg/21 mcg are combinations of fluticasone propionate and salmeterol xinafoate. One active component of ADVAIR HFA is fluticasone propionate, a corticosteroid having the chemical name S- (fluoromethyl) 6α,9-difluoro-11β,17-dihydroxy-16α-methyl-3-oxoandrosta-1,4-diene-17β-carbothioate, 17-propionate and the following chemical structure: Fluticasone propionate is a white powder with a molecular weight of 500.6,.
Cetirizine Hydrochloride Oral Solution
cetirizine hydrochloride oral solution
DESCRIPTION Cetirizine hydrochloride is an orally active and selective HI-receptor antagonist. The chemical name is(±) - [2- [4- [(4-chlorophenyl)phenylmethyl]-1- piperazinyl] ethoxy] acetic acid, dihydrochloride.
Medical Disclaimer
This drug information is for educational purposes only and should not replace professional medical advice. Drug information is sourced from the FDA National Drug Code Directory and Structured Product Labeling. Always consult with a healthcare provider before starting, stopping, or changing any medication.