Valsartan – an Angiotensin Receptor Blocker (Diovan)

Valsartan, sold under the brand name Diovan, is an angiotensin receptor blocker (ARB) medication primarily used to treat high blood pressure (hypertension) and heart failure. It is also prescribed to protect the heart following a recent heart attack. By blocking the effects of angiotensin II, valsartan relaxes blood vessels, reduces blood pressure, and eases the heart’s workload.

This article provides detailed information on valsartan’s uses, mechanism of action, dosage instructions, side effects, precautions, and lifestyle advice to help patients use it safely and effectively. Always consult your doctor for personalized advice, as this is not a substitute for medical guidance.

About valsartan

Valsartan belongs to a class of medicines called angiotensin-II receptor antagonists (AIIRAs), also known as ARBs. It is prescribed for individuals with hypertension, where blood pressure is too high, heart failure where the heart does not pump efficiently, or to safeguard the heart post-heart attack.

The medication works by blocking the action of angiotensin II, a chemical in the body that causes blood vessels to narrow (vasoconstriction). By preventing this, valsartan allows blood vessels to relax and widen, lowering blood pressure and making it easier for the heart to pump blood. This mechanism also reduces strain on the heart after a myocardial infarction and helps manage symptoms of heart failure.

Angiotensin II also promotes the release of aldosterone, which leads to sodium and water retention in the kidneys. Valsartan interrupts the renin-angiotensin-aldosterone system (RAAS), reducing these effects and promoting sodium excretion, further aiding blood pressure control. Clinical trials have demonstrated that valsartan reduces risks of stroke, myocardial infarction, heart failure progression, and hospitalization, especially in patients intolerant to ACE inhibitors.

Valsartan is available in tablet form in various strengths (e.g., 40 mg, 80 mg, 160 mg, 320 mg) and can be used alone or combined with other antihypertensives. It is approved for adults and children over 1 year old for hypertension. In heart failure (NYHA class II-IV) and post-MI left ventricular dysfunction, it improves survival and reduces hospitalization risks.

Before taking valsartan

Before starting valsartan, inform your doctor about your medical history and current medications to ensure it is safe. Certain conditions or drugs may contraindicate its use or require dose adjustments.

• Pregnancy, trying to conceive, or breastfeeding: Valsartan can harm the fetus (especially in the second and third trimesters) and passes into breast milk. It is contraindicated in pregnancy.
• Kidney problems: Particularly renal artery stenosis or severe impairment, as valsartan affects kidney function via RAAS blockade.
• Heart conditions: Issues with heart valves, muscle (e.g., hypertrophic cardiomyopathy), or recent heart attack.
• Liver or bile flow problems: Valsartan is metabolized by the liver; caution in hepatic impairment.
• Other medications: Especially ACE inhibitors (e.g., enalapril), aliskiren (especially in diabetes), potassium-sparing diuretics, NSAIDs, or lithium. Combinations increase risks of hyperkalemia, hypotension, and renal failure.
• Allergies: History of angioedema or hypersensitivity to ARBs.

Regular monitoring of blood pressure, kidney function (e.g., creatinine), and electrolytes (especially potassium) is essential, particularly at treatment start and in dose increases.

How to take valsartan

Follow your doctor’s instructions precisely. Read the patient information leaflet (PIL) provided with the medication for full details on usage and side effects.

• Dosage: Typically once or twice daily, depending on the condition. For hypertension, start at 80-160 mg once daily, up to 320 mg. Heart failure: 40 mg twice daily, titrated to 160 mg twice daily. Post-MI: 20 mg twice daily, increasing to 160 mg twice daily.
• Administration: Swallow tablets whole with water, with or without food. If twice daily, space doses evenly (e.g., morning and evening).
• Dose adjustments: Your doctor may start low and increase gradually. Check tablet strength each refill to avoid errors.
• Missed dose: Take as soon as remembered unless near next dose; do not double up.
• Duration: Long-term for chronic conditions unless side effects occur.

Getting the most from your treatment

To optimize benefits and minimize risks, adhere to monitoring and lifestyle recommendations.

• Regular check-ups: Attend appointments for blood pressure checks, blood tests (kidneys, potassium), and progress review.
• Other medicines: Consult a pharmacist before using over-the-counter drugs, especially NSAIDs (ibuprofen, aspirin) which can reduce efficacy and raise side effect risks.
• Lifestyle advice:
  • Follow a heart-healthy diet low in salt.
  • Exercise regularly as advised.
  • Quit smoking.
  • Maintain a healthy weight.
• Alcohol: Limit or avoid, as it can enhance dizziness and hypotension.
• Salt substitutes: Avoid potassium-containing ones to prevent hyperkalemia.
• Surgery/dental work: Inform providers, as anesthesia may cause excessive blood pressure drop.

Side-effects of valsartan

Most people tolerate valsartan well, but side effects can occur. Common ones are mild; report persistent or severe symptoms to your doctor.

Important warnings:

• Allergic reactions (rare): Swelling of face/mouth/throat (angioedema), difficulty breathing—seek emergency care immediately.
• Hyperkalemia: High potassium symptoms (muscle weakness, irregular heartbeat)—requires monitoring.
• Kidney issues: Changes in urination, swelling.
• Other rare: Rhabdomyolysis, liver enzyme elevation.

Cough is less common with ARBs than ACE inhibitors. If symptoms worry you, contact your doctor or pharmacist.

Frequently Asked Questions (FAQs)

Q: Can I take valsartan if I’m pregnant?

A: No, valsartan is contraindicated in pregnancy due to risks of fetal harm. Use effective contraception and inform your doctor if planning pregnancy.

Q: Does valsartan cause weight gain?

A: Weight gain is not a common side effect. Lifestyle factors or fluid retention in heart failure may contribute; discuss with your doctor.

Q: How long does it take for valsartan to lower blood pressure?

A: Effects start within 2 weeks, with full benefits in 4 weeks. Continue as prescribed.

Q: Can I stop taking valsartan suddenly?

A: No, abrupt stopping can cause blood pressure rebound. Taper under medical supervision.

Q: Is valsartan safe with diabetes?

A: Yes, often used for diabetic nephropathy, but avoid with aliskiren or certain ACE inhibitor combos. Monitor kidneys closely.

Q: What if I forget a dose?

A: Take it as soon as possible unless it’s almost time for the next. Never double dose.

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medha deb

 

Medha Deb is an editor with a master's degree in Applied Linguistics from the University of Hyderabad. She believes that her qualification has helped her develop a deep understanding of language and its application in various contexts.

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