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Dyazide (Hydrochlorothiazide / Triamterene) - Summary



Hyperkalemia: Abnormal elevation of serum potassium levels (greater than or equal to 5.5 mEq/liter) can occur with all potassium-sparing diuretic combinations, including DYAZIDE. Hyperkalemia is more likely to occur in patients with renal impairment and diabetes (even without evidence of renal impairment), and in the elderly or severely ill. Since uncorrected hyperkalemia may be fatal, serum potassium levels must be monitored at frequent intervals especially in patients first receiving DYAZIDE, when dosages are changed or with any illness that may influence renal function.



Each Dyazide capsule for oral use, with opaque red cap and opaque white body, contains hydrochlorothiazide 25 mg and triamterene 37.5 mg, and is imprinted with the product name DYAZIDE and SB. Hydrochlorothiazide is a diuretic/antihypertensive agent and triamterene is an antikaliuretic agent.

This fixed combination drug is not indicated for the initial therapy of edema or hypertension except in individuals in whom the development of hypokalemia cannot be risked.

Dyazide is indicated for the treatment of hypertension or edema in patients who develop hypokalemia on hydrochlorothiazide alone.

Dyazide is also indicated for those patients who require a thiazide diuretic and in whom the development of hypokalemia cannot be risked.

Dyazide may be used alone or as an adjunct to other antihypertensive drugs, such as beta-blockers. Since Dyazide may enhance the action of these agents, dosage adjustments may be necessary.

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Published Studies Related to Dyazide (Hydrochlorothiazide / Triamterene)

Bioequivalence evaluation of a triamterene-hydrochlorothiazide generic product: a new bioequivalence index for fixed-dose combinations. [2011.02]
In this study, an open, double-blind, randomized, two-period, two-group crossover design was conducted in 14 healthy volunteers to study the bioequivalence of a fixed-dose generic product. After administration of test or reference products to each volunteer, both active ingredients were determined simultaneously in plasma samples using a developed and validated HPLC-UV method, and pharmacokinetic parameters, including C(max), T(max), AUC(0-t) , AUC(0infinity), terminal elimination rate constant (lambdaz), volume of distribution in steady state (Vd(ss)), mean residence time (MRT), clearance (Cl), terminal elimination rate constant (Kel) were determined in each subject using the standard non-compartmental approach...

Effect of quinapril and triamterene/hydrochlorothiazide on cardiac and vascular end-organ damage in isolated systolic hypertension. [1998.02]
We compared, in a prospective double-blind randomized study, the effect of the angiotensin-converting enzyme inhibitor quinapril (QUI) with that of triamterene/hydrochlorothiazide (THCT) treatment on cardiovascular end-organ damage in subjects with untreated isolated systolic hypertension (ISH)... Results of LV diastolic function and peripheral vascular resistance were less clear but appear to show less favorable changes in the THCT subjects treatment group.

Pharmacokinetics and pharmacodynamics of triamterene and hydrochlorothiazide and their combination in healthy volunteers. [1997.10]
Although triamterene has been in clinical use for over 30 years, the linearity of triamterene kinetics was not systematically tested. Moreover, although triamterene is mostly applied concomitantly with thiazide-type diuretics the interaction of triamterene (TA) with hydrochlorothiazide (HCT) is subject to a controversial discussion.

Felodipine or hydrochlorothiazide/triamterene for treatment of hypertension in the elderly: effects on blood pressure, hypertensive heart disease, metabolic and hormonal parameters. [1996.05]
The aim of the study was to compare the antihypertensive efficacy of either felodipine or the diuretic combination hydrochlorothiazide/triamterene in a group (n = 65) of elderly (> or = 70 years) hypertensives (office blood pressure > or = 160/95 mmHg) with special regard to ambulatory blood pressure monitoring, hypertensive heart disease and metabolic parameters...

A study of plasma sodium levels in elderly people taking amiloride or triamterene in combination with hydrochlorothiazide. [1993.10]
This study was performed to compare the effect of one month's treatment with hydrochlorothiazide (25 mg) in combination with either amiloride (2.5 mg) or triamterene (50 mg) on plasma sodium levels in elderly people in institutional care. Fifty residents of NHS nursing or social service residential care established on diuretics for congestive cardiac failure and aged 64 years or over were recruited...

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Clinical Trials Related to Dyazide (Hydrochlorothiazide / Triamterene)

Action to Control Cardiovascular Risk in Diabetes (ACCORD) [Completed]
The purpose of this study is to prevent major cardiovascular events (heart attack, stroke, or cardiovascular death) in adults with type 2 diabetes mellitus using intensive glycemic control, intensive blood pressure control, and multiple lipid management.

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Reports of Suspected Dyazide (Hydrochlorothiazide / Triamterene) Side Effects

Drug Ineffective (3)Urinary Tract Infection (3)Anaphylactic Reaction (2)Urticaria (2)Cerebrovascular Disorder (2)Generalised Oedema (2)Vaginal Haemorrhage (2)Speech Disorder (2)Palpitations (2)Oedema Peripheral (2)more >>


Based on a total of 1 ratings/reviews, Dyazide has an overall score of 10. The effectiveness score is 10 and the side effect score is 10. The scores are on ten point scale: 10 - best, 1 - worst.

Dyazide review by care giver of 47 year old female patient

Overall rating:  
Effectiveness:   Highly Effective
Side effects:   No Side Effects
Treatment Info
Condition / reason:   general fluid retention
Dosage & duration:   half tablet twice daily taken daily for the period of 8 months
Other conditions:   food allergies, menopause
Other drugs taken:   dessicated porcine thyroid, estrodoil, progesterone
Reported Results
Benefits:   Completely controlled swelling.
Side effects:   There appeared to be no side effects.
Comments:   Her doctor originally had prescribed hydrochlorothiazide 25 mg per day for her fluid retention. This held it for 6 months, then it's effectiveness lessened. We didn't want to double the dose as we were concerned with potassium loss. Instead we used this combination formula, which adds in the potassium sparing triamterene. This medicine has held her swelling completely in check for more than 8 months. We have monitored her liver function and mineral levels, and haven't noticed any problems.

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Page last updated: 2011-12-09

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