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Diovan HCT combines valsartan, an angiotensin II receptor blocker (ARB), with hydrochlorothiazide (HCTZ), a thiazide diuretic, to treat high blood pressure. Together, they relax blood vessels and help the body clear excess salt and water, lowering blood pressure and reducing the risk of stroke, heart attack, and kidney problems. Diovan HCT is available by prescription only and should be taken as directed by a healthcare provider.
Reviewed by:
Dr. Steve Malen, PharmD
Dr. Steven Blikstein, PharmD
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Diovan HCT combines valsartan, an angiotensin II receptor blocker (ARB), with hydrochlorothiazide (HCTZ), a thiazide diuretic, to treat high blood pressure. Together, they relax blood vessels and help the body clear excess salt and water, lowering blood pressure and reducing the risk of stroke, heart attack, and kidney problems. Diovan HCT is available by prescription only and should be taken as directed by a healthcare provider.
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Important safety information
Diovan HCT is not appropriate for everyone. Knowing when it should not be used helps ensure safe treatment.
Anuria: Patients whose kidneys are not producing urine should not take Diovan HCT.
Hypersensitivity: Patients allergic to valsartan, hydrochlorothiazide, other sulfonamide-derived drugs, or any ingredient in the tablet should not take it.
Aliskiren in patients with diabetes: Diovan HCT should not be taken together with aliskiren by patients with diabetes.
FDA Boxed Warning: Fetal Toxicity. When pregnancy is detected, Diovan HCT should be discontinued as soon as possible. Drugs that act on the renin-angiotensin system can cause injury and death to the developing fetus.
Volume or salt depletion: Patients who are dehydrated or on high-dose diuretics have a higher risk of symptomatic low blood pressure when starting treatment.
Kidney or liver impairment: Use with caution and monitor closely. Not recommended in severe kidney impairment.
Electrolyte imbalances: Potassium, sodium, and magnesium levels should be monitored periodically.
Lupus: Thiazide diuretics may worsen or activate systemic lupus erythematosus.
Eye problems: Hydrochlorothiazide can cause acute angle-closure glaucoma. Stop the medication and seek care for sudden vision changes or eye pain.
Healthcare providers should review each patient's medical history, current health, and other medications before prescribing Diovan HCT.
Lotrel is a prescription combination medication used to treat high blood pressure. It combines two proven blood pressure-lowering medicines with different mechanisms of action: amlodipine, a calcium channel blocker, and benazepril, an angiotensin-converting enzyme (ACE) inhibitor. Together, they help relax and widen blood vessels, making it easier for the heart to pump blood. By controlling high blood pressure, Lotrel helps reduce the risk of heart attack, stroke, and kidney complications. It should be taken exactly as directed by a healthcare provider. Sudden discontinuation may cause a rise in blood pressure or worsening of chest pain in patients with coronary artery disease.
Amlodipine/valsartan is an oral, fixed-dose combination prescription tablet pairing a dihydropyridine calcium channel blocker (CCB) with a non-heterocyclic angiotensin II receptor blocker (ARB). Clinically, this combination tablet is indicated for the treatment of hypertension . It is utilized within two primary management frameworks: Step-Up Combination Therapy: For patients whose blood pressure is not adequately controlled on amlodipine (or an alternative CCB) alone, or on valsartan (or an alt
Atenolol is a prescription beta-blocker used to treat high blood pressure, chest pain, and to improve survival after a heart attack (myocardial infarction). It works by slowing the heart rate and reducing the force of heart contractions, which helps lower blood pressure and reduce strain on the heart. Atenolol is often part of a long-term cardiovascular care plan to reduce the risk of complications such as stroke, heart failure, and heart attack recurrence. It should be taken exactly as directed by your healthcare provider. Do not stop taking it suddenly, as this can cause chest pain, irregular heartbeat, or even a heart attack in some patients.
Benazepril is a prescription ACE inhibitor used to treat high blood pressure by relaxing blood vessels and reducing strain on the heart. It lowers the risk of stroke, heart attack, and kidney complications and may be taken alone or with other antihypertensive drugs. Benazepril starts working within hours, with full effects seen after up to two weeks of consistent use. It is available by prescription only and should be taken exactly as directed, typically once or twice daily. Do not stop use without medical advice, and combine treatment with healthy lifestyle habits for the best results.
Chlorthalidone is a prescription diuretic used to treat high blood pressure and fluid retention (edema) caused by heart failure, kidney disease, or other conditions. It works by helping the kidneys remove excess salt and water, lowering blood pressure, and reducing swelling. Common side effects include dizziness and increased urination. Chlorthalidone should be taken as prescribed, usually once daily in the morning. Regular electrolyte monitoring may be needed.
Clopidogrel is a prescription antiplatelet medication used to prevent blood clots in patients with a history of heart attack, stroke, or peripheral arterial disease, and after procedures like stent placement. It works by preventing platelets from clumping, improving blood flow, and reducing the risk of serious cardiovascular events. Clopidogrel should be taken exactly as prescribed, typically once daily. Because it increases bleeding risk, patients should inform their doctor before surgeries, dental procedures, or when using other drugs or supplements that affect clotting.
Valsartan is one of the active components of Diovan HCT and is classified as an angiotensin II receptor blocker (ARB). It works by blocking the action of angiotensin II, a hormone that causes blood vessels to tighten and signals the body to hold on to salt and water.
By blocking this hormone, valsartan helps blood vessels relax and widen, lowering blood pressure and reducing the workload on the heart. This improved blood flow is central to managing hypertension.
Hydrochlorothiazide (HCTZ), the other component of Diovan HCT, is a thiazide diuretic. It works by increasing urine output, which helps the body remove excess salt and water. This reduces blood volume and lowers blood pressure.
Diovan HCT combines these two complementary mechanisms in a single tablet. By addressing more than one driver of high blood pressure, it may be effective for patients whose blood pressure is not adequately controlled on a single medication.
Note: This medication's generic and brand-name formulations are used interchangeably throughout this article.
Diovan HCT is a prescription medication used to manage hypertension, commonly known as high blood pressure. It combines two active ingredients, valsartan and hydrochlorothiazide, in one once-daily tablet.
Diovan HCT is designed to lower blood pressure and reduce the risk of complications from hypertension, such as stroke, heart attack, and kidney problems. The generic version, valsartan/hydrochlorothiazide, contains the same active ingredients and is available in multiple strengths.
Diovan HCT is prescribed to manage hypertension, which is a major risk factor for cardiovascular events.
Hypertension: Diovan HCT is used to lower high blood pressure, which reduces the risk of fatal and nonfatal cardiovascular events, primarily strokes and heart attacks.
Add-on or Switch Therapy: It is commonly used in patients whose blood pressure is not adequately controlled on valsartan or hydrochlorothiazide alone.
Initial Therapy: It may be used as a first treatment in patients who are likely to need more than one medication to reach their blood pressure goals.
While the primary indication for Diovan HCT is hypertension, clinicians may prescribe it for other uses based on individual needs and clinical evidence. Any off-label use should be discussed with a healthcare professional for individualized advice.
By keeping blood pressure under control, Diovan HCT helps reduce strain on the heart, blood vessels, and kidneys over the long term.
Diovan HCT lowers blood pressure through two complementary mechanisms that target different parts of blood pressure regulation.
Valsartan: Selectively blocks the angiotensin II type 1 (AT1) receptor. This prevents angiotensin II from constricting blood vessels and from stimulating the release of aldosterone, which leads to relaxed blood vessels and less salt and water retention.
Hydrochlorothiazide: Acts on the kidneys to reduce the reabsorption of sodium and chloride, increasing the excretion of salt and water and lowering blood volume.
The two ingredients also balance each other. Hydrochlorothiazide can lower potassium levels, while valsartan tends to raise them, which can help keep potassium closer to normal.
Valsartan reaches peak blood levels within 2 to 4 hours and is eliminated mostly unchanged through bile and feces, with minimal metabolism by liver enzymes. Hydrochlorothiazide is not metabolized and is eliminated unchanged by the kidneys, so its effect depends on kidney function. Together, these profiles support steady, once-daily blood pressure control, with most of the effect seen within 2 to 4 weeks.
Proper dosing of Diovan HCT helps maximize its benefits while minimizing side effects. Healthcare providers tailor the dose to each patient's blood pressure response, other medications, and overall health.
Valsartan/HCTZ tablets are available in 80 mg/12.5 mg, 160 mg/12.5 mg, 160 mg/25 mg, 320 mg/12.5 mg, and 320 mg/25 mg strengths.
Initial Therapy: The usual starting dose is 160 mg/12.5 mg once daily. The dose may be increased after 1 to 2 weeks to a maximum of 320 mg/25 mg once daily.
Add-on or Switch Therapy: Patients not controlled on valsartan or hydrochlorothiazide alone may be switched to the combination, starting with a strength that matches their current regimen.
Maximum Dose: 320 mg/25 mg once daily.
Take Diovan HCT by mouth once daily, with or without food, at about the same time each day.
Continue taking it even if you feel well. High blood pressure often has no symptoms.
Do not stop taking it without talking to your healthcare provider.
Patients with severe kidney impairment (creatinine clearance of 30 mL/min or less) or severe liver impairment generally should not use this combination. Older adults and patients who are volume depleted may need closer monitoring when starting treatment.
Like all medications, Diovan HCT can cause side effects. Most are mild and improve as the body adjusts, but some require prompt medical attention.
Dizziness: Often occurs while the body adjusts to lower blood pressure, especially when standing up quickly.
Headache: Usually mild and temporary.
Fatigue: Some patients feel tired, particularly early in treatment.
Cold-like symptoms: Stuffy nose, sore throat, or upper respiratory symptoms.
Diarrhea: Occasionally reported and typically mild.
Seek medical care promptly if any of the following occur:
Low blood pressure: Fainting or severe dizziness, especially in patients who are dehydrated or taking high doses of diuretics.
Electrolyte changes: Low or high potassium, low sodium, or low magnesium, which can cause muscle cramps, weakness, confusion, or an irregular heartbeat.
Kidney problems: Changes in urination or swelling in the feet or ankles.
Eye problems: Sudden decrease in vision or eye pain, which can be signs of acute angle-closure glaucoma linked to hydrochlorothiazide.
Severe allergic reactions: Swelling of the face, lips, tongue, or throat, or trouble breathing.
Hydrochlorothiazide may raise blood sugar, uric acid, and cholesterol levels and has been associated with an increased risk of non-melanoma skin cancer. Regular checkups, periodic lab work, and sun protection are recommended.
Diovan HCT can interact with other medications and supplements. Tell your healthcare provider about everything you take, including over-the-counter products.
Potassium supplements and salt substitutes: Products containing potassium, and potassium-sparing diuretics such as spironolactone, can raise potassium to unsafe levels.
NSAIDs: Ibuprofen, naproxen, and similar pain relievers can reduce the blood pressure-lowering effect and increase the risk of kidney problems.
Lithium: Diovan HCT can raise lithium levels and increase the risk of lithium toxicity. Lithium levels should be monitored.
Other renin-angiotensin system blockers: Combining with ACE inhibitors, other ARBs, or aliskiren increases the risk of low blood pressure, high potassium, and kidney problems. Aliskiren should not be used with Diovan HCT in patients with diabetes.
Diabetes medications: Hydrochlorothiazide can raise blood sugar, so diabetes medication doses may need adjustment.
Cholestyramine and colestipol: These can reduce the absorption of hydrochlorothiazide. Separate the doses as directed.
Corticosteroids: May increase the risk of low potassium.
Alcohol can add to the blood pressure-lowering effect and increase dizziness or lightheadedness. Limit alcohol while taking this medication.
Administration & Dosage
Diovan HCT should be taken by mouth once a day, with or without food, as prescribed by your healthcare provider. Try to take it at the same time each day and keep taking it even if you feel well, since high blood pressure often has no symptoms.
Diovan HCT (valsartan/hydrochlorothiazide) comes as oral tablets in five strengths: 80 mg/12.5 mg, 160 mg/12.5 mg, 160 mg/25 mg, 320 mg/12.5 mg, and 320 mg/25 mg.
The usual starting dose is 160 mg/12.5 mg once daily. Your healthcare provider may increase the dose after 1 to 2 weeks based on your blood pressure, up to a maximum of 320 mg/25 mg once daily.
Valsartan/HCTZ tablets are generally swallowed whole with water. Do not split or crush your tablets unless your pharmacist or healthcare provider tells you it is okay for your specific product.
Take the missed dose as soon as you remember. If it is almost time for your next dose, skip the missed dose and take the next one at your regular time. Do not take two doses at once to make up for a missed dose.
Hypertension Treatment
Yes. Diovan HCT is a combination hypertension medication that contains valsartan, an angiotensin II receptor blocker (ARB), and hydrochlorothiazide (HCTZ), a thiazide diuretic. It is one of several hypertension drugs that combine two blood pressure medicines in one tablet.
Providers often prescribe valsartan/HCTZ when blood pressure is not controlled on valsartan or hydrochlorothiazide alone, or as a first treatment when someone is likely to need two medications to reach their goal. One combination pill can also make a daily routine simpler than taking two separate tablets.
Yes. Stage 2 hypertension usually needs more than one medication, and Diovan HCT combines two blood pressure drugs that work in different ways. The usual starting dose is 160 mg/12.5 mg once daily, which your provider can increase based on your readings.
Valsartan/HCTZ starts working within the first couple of weeks, and most of its blood pressure lowering effect is seen within 2 to 4 weeks. Checking your blood pressure at home can help you and your provider see how well it is working.
Most people with hypertension have no symptoms at all. Very high blood pressure can sometimes cause headaches, vision changes, or chest discomfort, which need prompt medical care. Keep taking Diovan HCT as prescribed even when you feel fine, because untreated high blood pressure can quietly damage the heart, brain, and kidneys.
Uses & Mechanism of Action
Diovan HCT is the brand name for valsartan and hydrochlorothiazide, a prescription tablet used to treat high blood pressure. It combines an ARB and a thiazide diuretic in one once-daily pill.
Valsartan blocks angiotensin II, a hormone that tightens blood vessels, so vessels relax and widen. Hydrochlorothiazide helps the kidneys remove extra salt and water. Together they lower blood pressure through two complementary pathways.
No. Diovan HCT is not a controlled substance. It is a standard prescription medication and can be refilled as directed by your prescriber.
Side Effects & Safety
The most common side effects include dizziness, headache, fatigue, and cold-like symptoms such as a stuffy nose or sore throat. Hydrochlorothiazide can also cause more frequent urination. Contact your provider if side effects are bothersome or do not go away.
Yes, it can. Hydrochlorothiazide is a diuretic, so you may urinate more often, especially when you first start. Taking your dose in the morning can help you avoid waking up at night to use the bathroom.
It can. Hydrochlorothiazide tends to lower potassium, while valsartan tends to raise it, so the effects partly balance out. Your provider may check your potassium and other electrolytes with periodic blood tests.
Interactions & Contraindications
NSAIDs like ibuprofen and naproxen can make valsartan/HCTZ less effective and raise the risk of kidney problems, especially with regular use. Ask your pharmacist or provider before using them. Acetaminophen is often a safer choice for occasional pain.
Yes, unless your provider tells you otherwise. Potassium supplements and salt substitutes that contain potassium chloride can raise potassium to unsafe levels when combined with valsartan.
Alcohol can add to the blood pressure lowering effect and make dizziness or lightheadedness worse. Limit alcohol and be careful when standing up quickly.
Generic & Alternatives
Yes. The generic version is valsartan and hydrochlorothiazide, often shortened to valsartan/HCTZ. It contains the same active ingredients and works the same way as brand-name Diovan HCT.
No, but they are similar. Both combine an ARB with hydrochlorothiazide to treat high blood pressure. Valsartan and losartan are different ARBs with different doses, so you should not switch between them without your provider's direction.