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Hyzaar (Losartan Potassium / Hydrochlorothiazide) - Summary



When used in pregnancy during the second and third trimesters, drugs that act directly on the renin-angiotensin system can cause injury and even death to the developing fetus. When pregnancy is detected, HYZAAR should be discontinued as soon as possible. See WARNINGS, Fetal/Neonatal Morbidity and Mortality.




HYZAAR 50-12.5 (losartan potassium-hydrochlorothiazide) and HYZAAR 100-25 (losartan potassium-hydrochlorothiazide), combines an angiotensin II receptor (type AT1) antagonist and a diuretic, hydrochlorothiazide.

HYZAAR is indicated for the treatment of hypertension. This fixed dose combination is not indicated for initial therapy of hypertension, except when the hypertension is severe enough that the value of achieving prompt blood pressure control exceeds the risk of initiating combination therapy in these patients (see CLINICAL PHARMACOLOGY, Pharmacodynamics and Clinical Effects, and DOSAGE AND ADMINISTRATION).

See all Hyzaar indications & dosage >>


Media Articles Related to Hyzaar (Losartan / Hydrochlorothiazide)

Masked Hypertension Linked to Cognitive Decline
Source: theheart.org | Medscape Cardiology Headlines [2015.05.22]
Ambulatory blood-pressure measurements may reveal "the hidden risk" of diminished cognitive function in older patients, say researchers. In addition, this risk may be increased twofold, they report.
Heartwire from Medscape

New data show need for improved monitoring for pulmonary hypertension following pulmonary embolism
Source: Respiratory / Asthma News From Medical News Today [2015.05.20]
Results from a retrospective cohort study presented at the American Thoracic Society (ATS) 2015 International Conference in Denver found that the incidence of pulmonary hypertension (PH) among...

Managing Hypertension: Technology Challenges Old Habits
Source: MedPage Today Cardiovascular [2015.05.20]
(MedPage Today) -- More accurate automated readings should replace the standard of care in the U.S., says one advocate

American Society of Hypertension (ASH) 2015 Annual Scientific Meeting
Source: theheart.org | Medscape Cardiology Headlines [2015.05.18]
Read clinically focused news coverage of key developments from ASH 2015.
Medscape Cardiology

Odd genetic syndrome suggests increased blood vessel resistance could cause hypertension
Source: Hypertension News From Medical News Today [2015.05.13]
The culmination of two decades of research, a new study reveals the genetic causes of a curious, rare syndrome that manifests as hypertension (high blood pressure) accompanied by short fingers...

more news >>

Published Studies Related to Hyzaar (Losartan / Hydrochlorothiazide)

Safety and benefits of a tablet combining losartan and hydrochlorothiazide in Japanese diabetic patients with hypertension. [2009.12]
This study was conducted to determine the effects of a tablet combining losartan/hydrochlorothiazide (L/HCTZ) in comparison with losartan alone in Japanese diabetic patients with hypertension. Thirty consecutive Japanese diabetic patients with hypertension were randomly assigned to group A, receiving losartan alone for the first 3 months, then L/HCTZ for the next 3 months, or group B, receiving L/HCTZ for the first 3 months, then losartan alone for the next 3 months...

A randomized, comparative study evaluating the efficacy and tolerability of losartan-low dose chlorthalidone (6.25 mg) combination with losartan-hydrochlorothiazide (12.5 mg) combination in Indian patients with mild-to-moderate essential hypertension. [2009.07]
OBJECTIVE: The relationship of blood pressure (BP) to cardiovascular risk is linear, positive, and continuous. Lowering elevated BP reduces the risk of cardiovascular events. The primary objective of this randomized, multicenter, comparative, 3-month, open-label study was to evaluate the antihypertensive efficacy of losartan/chlorthalidone versus losartan/hydrochlorothiazide in mild-to-moderate essential hypertension... CONCLUSIONS: The losartan/low-dose chlorthalidone (6.25 mg) combination is as effective as the widely used losartan/hydrochlorothiazide combination in lowering BP and is well tolerated, thus providing a useful therapeutic option for treating mild-to-moderate hypertension.

Effectiveness of open-label losartan/hydrochlorothiazide combination therapy in Asian patients with hypertension not controlled with ACE inhibitor or ARB monotherapy. [2009.06]
Antihypertensive efficacy and safety of losartan/hydrochlorothiazide (HCTZ) combinations have not been adequately studied in Asians. In this open-label, 12-week study in seven Asian areas, patients on monotherapy with angiotensin receptor blockers (ARBs) or angiotensin-converting enzyme inhibitors (ACEIs) but not at blood pressure (BP) goal (sitting diastolic BP (SiDBP) <90 mm Hg in non-diabetics and <80 mm Hg in diabetics) were switched to losartan 50 mg/HCTZ 12.5 mg...

Comparison of therapies between fixed-dose telmisartan/hydrochlorothiazide and losartan/hydrochlorothiazide in patients with mild to moderate hypertension. [2009.01]
Among angiotensin receptor blockers (ARBs), telmisartan is suggested to function as a partial agonist of peroxisome proliferator-activated receptor-gamma (PPAR gamma) and to improve lipid and glucose metabolism. Clinical benefits of telmisartan over other ARBs may be apparent in combination with diuretics, which have harmful influences on lipid and glucose metabolism...

Ambulatory blood pressure comparison of the anti-hypertensive efficacy of fixed combinations of irbesartan/hydrochlorothiazide and losartan/hydrochlorothiazide in patients with mild-to-moderate hypertension. [2005.11]
This study examined whether the greater anti-hypertensive efficacy of irbesartan monotherapy over losartan monotherapy extends to the respective fixed-dose combinations with hydrochlorothiazide (HCTZ) in patients with mild-to-moderate hypertension. Patients were treated with either irbesartan 150 mg/HCTZ 12.5 mg or losartan 50 mg/HCTZ 12.5 mg over a 4-week period.

more studies >>

Clinical Trials Related to Hyzaar (Losartan / Hydrochlorothiazide)

HYZAAR vs. Ramipril for Diabetes [Completed]
A study to test the safety and efficacy of HYZAAR as compared to Ramipril in patients with type 2 diabetes mellitus (high blood sugar) and hypertension (high blood pressure).

Tarka vs. Hyzaar in Patients With Metabolic Syndrome (STAR) [Active, not recruiting]
The primary objective of this study is to determine whether impaired glucose tolerance is improved to a greater degree by Tarka than Hyzaar in subjects with metabolic syndrome

Evaluation of the Antihypertensive Effect of Hyzaar(R) and Cognitive Function of Hypertensive Patients [Completed]
Evaluate the antihypertensive and neuroprotective effects of Hyzaar(R) in elderly subjects in comparison with Natrilix(TM).

Bioequivalence Study of Amlodipine / Losartan/ Hydrochlorothiazide of PHARMALINE, Lebanon Under Fastion Conditions [Recruiting]
To assess the bioequivalence of the investigational TEST product with the marketed REFERENCE products by measurement of Plasma concentrations of Amlodipine ,Losartan, Carboxylic acid losartan metabolite & Hydrochlorothiazide in plasma and calculation of the bioequivalence parameters from those measurements followed by ANOVA and 90% confidence interval statistical evaluation.

Evaluate the Safety and Anti-Hypertensive Efficacy of Hyzaar(R) In Patients With Mild To Moderate Essential Hypertension [Completed]
Evaluate the safety and anti-hypertensive efficacy of hyzaar(R) in patients with mild to moderate essential hypertension.

more trials >>

Reports of Suspected Hyzaar (Losartan / Hydrochlorothiazide) Side Effects

Hyponatraemia (17)Drug Ineffective (11)Rhabdomyolysis (9)Hypokalaemia (9)Malaise (9)Cough (9)Aortic Dissection (8)Dehydration (8)Loss of Consciousness (7)Dizziness (7)more >>


Based on a total of 6 ratings/reviews, Hyzaar has an overall score of 7.83. The effectiveness score is 9.33 and the side effect score is 7. The scores are on ten point scale: 10 - best, 1 - worst. Below are selected reviews: the highest, the median and the lowest rated.

Hyzaar review by 58 year old female patient

Overall rating:  
Effectiveness:   Highly Effective
Side effects:   Mild Side Effects
Treatment Info
Condition / reason:   high blood pressure
Dosage & duration:   50/12.5 mg taken daily for the period of 2 years
Other conditions:   perennial allergic rhinitis
Other drugs taken:   alavert & singulair
Reported Results
Benefits:   lowered blood pressure
Side effects:   increased thirst; increased urination;
Comments:   take 1 Hyzaar every morning


Hyzaar review by 62 year old male patient

Overall rating:  
Effectiveness:   Considerably Effective
Side effects:   Moderate Side Effects
Treatment Info
Condition / reason:   High Blood Pressure
Dosage & duration:   standard dosage once a day (dosage frequency: once per day) for the period of 3 years
Other conditions:   irregular heartbeat
Other drugs taken:   just vitamins
Reported Results
Benefits:   reduced blood pressure and less water retention in legs and ankles
Side effects:   irregular heartbeat, low pulse rate...heart flutter...
Comments:   When I switched to the generic brand the side effects were moderate to severe, but after returning to the non generic Hyzaar once again, the side effects were less severe and acceptable once again. I wore a heart monitor and took active blood pressure readings in order to determine if the generic brand enhanced the side effects. While still not conclusive in my mind, I've elected to pay the extra dollars for the non generic brand.


Hyzaar review by 32 year old female patient

Overall rating:  
Effectiveness:   Considerably Effective
Side effects:   Moderate Side Effects
Treatment Info
Condition / reason:   High Blood Pressure
Dosage & duration:   25mg taken once daily for the period of 6 months
Other conditions:   None
Other drugs taken:   None
Reported Results
Benefits:   Lower my blood pressure out of the Prehypertension range
Side effects:   Tingling in legs (low potassium) which is expected. Unfortunately, it made my heart reate higher & irregular at times (slight flutters) thorughout the day. Ultimately it was difficult to exert myself during exercise b/c I would become exhausted and ouut of breath quickly due to elevated heart rate
Comments:   Simply take the dosage once a day at the same time and monitor my blood pressure

See all Hyzaar reviews / ratings >>

Page last updated: 2015-05-22

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