Atacand Plus
Candesartan/Hydrochlorothiazide Combination for High Blood Pressure
Quick Facts About Atacand Plus
Key Takeaways About Atacand Plus
- Dual-action blood pressure control: Combines an ARB (candesartan) with a thiazide diuretic (hydrochlorothiazide) for more effective blood pressure reduction than either drug alone
- Strictly contraindicated in pregnancy: Must not be used during pregnancy as it can cause serious foetal harm – discontinue immediately if pregnancy is detected
- Electrolyte monitoring essential: Hydrochlorothiazide can deplete potassium, sodium, and magnesium while candesartan may raise potassium – regular blood tests are needed
- Take once daily at the same time: Provides 24-hour blood pressure control; can be taken with or without food, ideally in the morning
- Stay well hydrated: The diuretic component increases urine output – drink adequate fluids and be cautious in hot weather or during vigorous exercise
What Is Atacand Plus and What Is It Used For?
Atacand Plus is a combination tablet containing candesartan cilexetil 8 mg and hydrochlorothiazide 12.5 mg. It is prescribed for the treatment of essential hypertension (high blood pressure) in adults whose blood pressure is not adequately controlled by either candesartan or hydrochlorothiazide alone.
Atacand Plus belongs to a therapeutic category known as fixed-dose combination antihypertensives. It combines two well-established classes of blood pressure medication into a single tablet: an angiotensin II receptor blocker (ARB) and a thiazide diuretic. This combination approach is well supported by international guidelines, including those from the European Society of Cardiology (ESC), the American Heart Association (AHA), and the International Society of Hypertension (ISH), all of which recommend combination therapy as an effective strategy for managing hypertension.
Candesartan cilexetil, the ARB component, works by selectively blocking the angiotensin II type 1 (AT1) receptor. Angiotensin II is a powerful hormone that normally causes blood vessels to constrict and triggers the release of aldosterone, a hormone that promotes sodium and water retention. By blocking the action of angiotensin II, candesartan allows blood vessels to relax and widen, reduces aldosterone secretion, and ultimately lowers blood pressure. Candesartan cilexetil is a prodrug that is rapidly converted to the active compound candesartan during absorption from the gastrointestinal tract.
Hydrochlorothiazide (HCTZ), the diuretic component, works by inhibiting sodium-chloride reabsorption in the distal convoluted tubule of the kidney. This action increases the excretion of sodium and water in the urine, which reduces blood volume and consequently lowers blood pressure. Additionally, with long-term use, hydrochlorothiazide reduces peripheral vascular resistance through mechanisms that are not entirely understood but may involve direct vasodilation and changes in sodium balance within vascular smooth muscle cells.
The combination of candesartan and hydrochlorothiazide is particularly effective because the two drugs act through complementary and synergistic mechanisms. Hydrochlorothiazide activates the renin-angiotensin-aldosterone system (RAAS) as a compensatory response to the reduction in blood volume. Candesartan counteracts this compensatory mechanism by blocking the downstream effects of angiotensin II. Furthermore, candesartan helps mitigate some of the metabolic effects of hydrochlorothiazide, such as potassium loss, because ARBs tend to increase potassium levels. This pharmacological synergy means that the combination provides greater blood pressure reduction than either component alone, often allowing lower doses of each drug to be used.
Hypertension affects approximately 1.28 billion adults worldwide according to the World Health Organization (WHO). It is a leading risk factor for cardiovascular disease, stroke, kidney disease, and premature death. The 2023 ESC/ESH Hypertension Guidelines recommend starting combination therapy with two agents for most patients with grade 2 hypertension or higher, as this approach achieves target blood pressure more quickly and with fewer dose adjustments than sequential monotherapy.
What Should You Know Before Taking Atacand Plus?
Before starting Atacand Plus, inform your doctor about all medical conditions, especially kidney disease, liver problems, diabetes, gout, and any allergies. This medication must not be used during pregnancy, in patients with severe kidney or liver impairment, or with certain other medications such as aliskiren in diabetic patients.
Contraindications
You should not take Atacand Plus if any of the following apply:
- Pregnancy or planning to become pregnant: Atacand Plus can cause serious foetal injury and death, particularly in the second and third trimesters. If pregnancy is detected, discontinue immediately
- Allergy to candesartan, hydrochlorothiazide, or sulfonamide-derived drugs: Hydrochlorothiazide is a sulfonamide derivative, and cross-reactivity may occur in patients with sulfonamide allergy, although this is debated
- Severe kidney impairment (GFR below 30 mL/min) or anuria (no urine output) – the kidneys cannot respond adequately to the diuretic
- Severe hepatic impairment or biliary cirrhosis: Candesartan is partly eliminated via bile, and impaired liver function may lead to dangerously elevated drug levels
- Refractory hypokalaemia or hypercalcaemia: Hydrochlorothiazide can worsen these electrolyte imbalances
- Severe hyponatraemia: The diuretic component may further deplete sodium levels
- Concomitant use with aliskiren in patients with diabetes or moderate-to-severe renal impairment (GFR below 60 mL/min) – dual RAAS blockade increases the risk of hypotension, hyperkalaemia, and renal failure
Atacand Plus must not be used at any stage of pregnancy. Drugs acting on the renin-angiotensin system can cause oligohydramnios (reduced amniotic fluid), foetal kidney failure, skull hypoplasia, limb contractures, and death. If you become pregnant while taking this medicine, stop it immediately and contact your doctor. You will need to be switched to a pregnancy-safe antihypertensive.
Warnings and Precautions
Talk to your doctor or pharmacist before taking Atacand Plus if you have or have had any of the following:
- Kidney problems: Renal function should be monitored periodically. The combination of an ARB and a diuretic can impair kidney function, particularly in patients with renal artery stenosis, heart failure, or volume depletion
- Heart failure: Treatment initiation may require careful dose titration and monitoring of renal function and potassium levels
- Aortic or mitral valve stenosis, or hypertrophic cardiomyopathy: Use with caution due to the risk of excessive blood pressure reduction
- Diabetes mellitus: Hydrochlorothiazide can increase blood glucose levels. Diabetic patients may require adjustment of their insulin or oral hypoglycaemic medications. Candesartan may have a modest protective effect on kidney function in diabetic nephropathy
- Gout or elevated uric acid: Hydrochlorothiazide increases uric acid levels and may trigger gout attacks
- Systemic lupus erythematosus (SLE): Thiazide diuretics have been reported to exacerbate or activate SLE
- Recent surgery or anaesthesia: Inform your surgeon and anaesthetist that you are taking Atacand Plus, as it may interact with anaesthetic agents and cause excessive blood pressure reduction
- Electrolyte imbalances: Regular monitoring of serum sodium, potassium, magnesium, calcium, and chloride is recommended, particularly during the first few months of treatment and after dose adjustments
Pregnancy and Breastfeeding
Pregnancy: Atacand Plus is absolutely contraindicated during pregnancy. Exposure to angiotensin II receptor blockers during the second and third trimesters has been associated with severe and potentially fatal foetal abnormalities, including renal dysfunction, oligohydramnios, skull ossification defects, and neonatal hypotension. First-trimester exposure, while less well characterised, has also been associated with increased risk. Women of childbearing age should use effective contraception while taking this medication. If pregnancy is confirmed, Atacand Plus must be stopped immediately.
Breastfeeding: Candesartan is excreted in breast milk in animal studies. Hydrochlorothiazide is known to pass into human breast milk. Due to the potential for adverse effects in the nursing infant, including hypotension, hyperkalaemia, and electrolyte disturbances, Atacand Plus is not recommended during breastfeeding. Your doctor may recommend an alternative medication or advise you to discontinue breastfeeding.
Driving and Operating Machinery
Dizziness and fatigue have been reported in patients taking Atacand Plus, particularly at the start of treatment, after dose increases, or when combined with alcohol. If you experience these symptoms, you should not drive or operate heavy machinery until they resolve. Individual responses to treatment vary, so assess your own reaction before engaging in activities requiring alertness.
How Does Atacand Plus Interact with Other Drugs?
Atacand Plus can interact with a wide range of medications, including lithium, NSAIDs, potassium supplements, other blood pressure medications, and certain diabetes drugs. Both the candesartan and hydrochlorothiazide components have their own interaction profiles, so it is essential to inform your doctor about all medications, supplements, and herbal remedies you are taking.
The interaction profile of Atacand Plus reflects the combined pharmacology of its two active ingredients. Candesartan primarily interacts with drugs that affect the renin-angiotensin-aldosterone system or potassium balance, while hydrochlorothiazide interacts with drugs affected by fluid and electrolyte changes. Some interactions are clinically significant and may require dose adjustments, additional monitoring, or avoidance of the combination altogether.
Major Interactions
| Drug | Category | Effect | Recommendation |
|---|---|---|---|
| Lithium | Mood stabiliser | Both ARBs and diuretics reduce lithium excretion, significantly increasing lithium levels and risk of toxicity | Avoid combination if possible. If unavoidable, monitor lithium levels very frequently |
| Aliskiren (in diabetic patients) | Direct renin inhibitor | Dual RAAS blockade increases risk of hypotension, hyperkalaemia, and renal impairment | Contraindicated in diabetic patients. Avoid in patients with GFR <60 mL/min |
| Potassium supplements / Potassium-sparing diuretics | Electrolyte supplements / Diuretics | Candesartan increases potassium retention; risk of dangerous hyperkalaemia | Monitor potassium closely. Use only if documented hypokalaemia and under medical supervision |
| ACE inhibitors (e.g. ramipril, enalapril) | Antihypertensive | Dual RAAS blockade – increased risk of hypotension, renal failure, and hyperkalaemia | Generally avoid combination. If necessary, use only under specialist supervision with close monitoring |
Moderate Interactions
| Drug | Category | Effect | Recommendation |
|---|---|---|---|
| NSAIDs (ibuprofen, naproxen, diclofenac) | Anti-inflammatory / Analgesic | Can reduce the blood pressure-lowering effect. May impair kidney function when combined with RAAS inhibitors | Use lowest effective NSAID dose for shortest duration. Monitor blood pressure and renal function |
| Digoxin | Cardiac glycoside | Diuretic-induced hypokalaemia and hypomagnesaemia increase the risk of digoxin toxicity and cardiac arrhythmias | Monitor electrolytes and digoxin levels regularly |
| Metformin | Antidiabetic | Hydrochlorothiazide may increase blood glucose levels, reducing metformin efficacy. Rare risk of lactic acidosis with renal impairment | Monitor blood glucose and renal function. Adjust diabetes treatment if necessary |
| Carbamazepine | Anticonvulsant | Increased risk of hyponatraemia (dangerously low sodium) when combined with hydrochlorothiazide | Monitor sodium levels; watch for symptoms like confusion, nausea, and seizures |
| Corticosteroids (prednisolone, dexamethasone) | Anti-inflammatory | Can reduce the blood pressure-lowering effect and worsen hydrochlorothiazide-induced potassium loss | Monitor blood pressure and potassium levels during concurrent use |
| Alcohol | CNS depressant | Enhances the blood pressure-lowering effect; increases risk of orthostatic hypotension and dehydration | Limit alcohol intake. Stand up slowly from sitting or lying positions |
This is not a complete list of drug interactions. Always tell your doctor and pharmacist about all prescription and over-the-counter medications, vitamins, herbal supplements, and dietary products you are taking. Some herbal supplements, such as liquorice root, can interact with Atacand Plus by causing potassium depletion and increasing blood pressure.
What Is the Correct Dosage of Atacand Plus?
The standard dose of Atacand Plus is one tablet (8 mg candesartan/12.5 mg hydrochlorothiazide) taken once daily. Atacand Plus is used when adequate blood pressure control has not been achieved with candesartan or hydrochlorothiazide alone. Always follow your doctor's prescribed dose.
Atacand Plus is intended as a step-up therapy, not as initial treatment for hypertension. Patients should first have their dose optimised on a single agent (typically candesartan alone) before being switched to the fixed-dose combination. The recommended dose depends on the individual patient's response and tolerability.
Adults
Standard Adult Dosage
One tablet of Atacand Plus (8 mg/12.5 mg) taken once daily by mouth, with or without food. The tablet should be swallowed whole with a glass of water, ideally at the same time each day. Taking it in the morning is often preferred to avoid nighttime urination from the diuretic effect.
The full blood pressure-lowering effect of Atacand Plus is typically achieved within 4 to 6 weeks of starting treatment. If blood pressure remains inadequately controlled, your doctor may consider alternative higher-strength combinations (e.g., 16 mg/12.5 mg) or adding a third antihypertensive agent from a different class, such as a calcium channel blocker.
Elderly Patients
Elderly Dosage Considerations
No specific dose adjustment is generally required in elderly patients. However, elderly patients are more susceptible to orthostatic hypotension (dizziness on standing), volume depletion, and electrolyte imbalances. Treatment should be initiated cautiously, and renal function and electrolytes should be monitored more frequently, particularly during the first weeks of therapy. Fluid intake should be adequate, especially in hot weather.
Use in Children and Adolescents
Paediatric Information
Atacand Plus is not recommended for use in children and adolescents under 18 years of age. The safety and efficacy of the fixed-dose combination have not been established in this age group. For paediatric hypertension, individual components may be used separately under specialist guidance.
Dose Adjustments for Kidney and Liver Impairment
Renal and Hepatic Considerations
Mild-to-moderate kidney impairment (GFR 30–60 mL/min): Atacand Plus may be used with caution, but renal function and electrolytes should be monitored closely. The diuretic effect of hydrochlorothiazide is reduced with declining kidney function.
Severe kidney impairment (GFR <30 mL/min) or anuria: Atacand Plus is contraindicated. Thiazide diuretics are generally ineffective at this level of renal impairment, and ARBs may worsen kidney function.
Mild-to-moderate liver impairment: A lower starting dose of candesartan is recommended before switching to the combination. Careful monitoring is required.
Severe liver impairment or cholestasis: Atacand Plus is contraindicated.
Missed Dose
If you forget to take your Atacand Plus tablet, take it as soon as you remember, provided it is not close to the time for your next dose. If it is nearly time for the next dose, simply skip the missed dose and continue with your regular schedule. Do not take a double dose to compensate for a missed one. Missing a single dose is unlikely to cause a sudden increase in blood pressure, but consistently missing doses will reduce the effectiveness of your treatment.
Overdose
In case of suspected overdose, seek medical attention immediately or contact your local poison control centre. Symptoms of overdose may include severe dizziness, fainting, and rapid or irregular heartbeat due to excessive blood pressure lowering and electrolyte disturbances. Treatment is primarily supportive and symptomatic, including intravenous fluid replacement and electrolyte correction. Candesartan is unlikely to be removed by haemodialysis, but hydrochlorothiazide can be partially removed.
If you suspect an overdose, call emergency services immediately. Symptoms may include severe hypotension, dizziness, fainting, electrolyte imbalances (particularly hypokalaemia or hyperkalaemia), and dehydration. Early medical intervention is critical.
What Are the Side Effects of Atacand Plus?
Like all medicines, Atacand Plus can cause side effects, although not everybody gets them. The most commonly reported side effects include dizziness, headache, fatigue, and increased urination. Serious but rare side effects include severe allergic reactions, significant electrolyte imbalances, and acute kidney injury.
The side effect profile of Atacand Plus reflects the combined effects of both candesartan and hydrochlorothiazide. In clinical trials, the combination was generally well tolerated, with most adverse events being mild to moderate in severity. The hydrochlorothiazide component is responsible for the majority of metabolic side effects (electrolyte disturbances, elevated uric acid, blood glucose changes), while the candesartan component is associated with hyperkalaemia and, rarely, angioedema.
Common
- Dizziness or lightheadedness, especially when standing up quickly
- Headache
- Fatigue and general weakness
- Increased urination (polyuria), particularly in the first few days
- Elevated blood uric acid levels (hyperuricaemia)
- Mildly elevated blood glucose levels
- Mildly elevated cholesterol or triglyceride levels
- Low potassium (hypokalaemia) – symptoms may include muscle cramps, weakness, irregular heartbeat
Uncommon
- Low blood pressure (hypotension), especially after the first dose or dose increase
- Nausea, vomiting, or diarrhoea
- Abdominal pain or discomfort
- Skin rash or itching
- Elevated blood creatinine or blood urea nitrogen (signs of reduced kidney function)
- Low sodium (hyponatraemia) – symptoms may include confusion, nausea, fatigue
- Back pain or muscle pain
- Orthostatic hypotension (drop in blood pressure on standing)
Rare
- Angioedema (swelling of the face, lips, tongue, or throat) – seek immediate medical attention
- Severe allergic (anaphylactic) reactions
- Acute kidney injury or acute renal failure
- Pancreatitis (inflammation of the pancreas) – associated with hydrochlorothiazide
- Photosensitivity (increased sensitivity to sunlight) – associated with hydrochlorothiazide
- Hepatitis or impaired liver function
- Blood disorders: leucopenia (low white blood cells), thrombocytopenia (low platelets)
- Severe hyperkalaemia (dangerously high potassium) – especially with impaired kidney function
- Interstitial nephritis – associated with hydrochlorothiazide
Contact your doctor or emergency services immediately if you experience swelling of the face, lips, tongue, or throat (angioedema), severe dizziness or fainting, signs of severe allergic reaction (difficulty breathing, widespread rash), very fast or irregular heartbeat, significant reduction in urine output, or signs of pancreatitis (severe abdominal pain radiating to the back with nausea and vomiting).
Long-term use of hydrochlorothiazide has been associated in some epidemiological studies with a small increased risk of non-melanoma skin cancer (basal cell carcinoma and squamous cell carcinoma). This is thought to be related to the photosensitising properties of the drug. If you are taking Atacand Plus long-term, protect your skin from excessive sun exposure and UV radiation, use sunscreen, and report any new or changing skin lesions to your doctor promptly.
How Should You Store Atacand Plus?
Store Atacand Plus tablets at room temperature below 30°C (86°F) in the original packaging to protect from moisture and light. Keep out of reach and sight of children.
Proper storage ensures that your medication remains effective throughout its shelf life. Atacand Plus tablets should be kept in the original blister pack until the time of use. Do not remove tablets from the packaging in advance. Avoid storing the medication in the bathroom, kitchen, or other areas where there may be high humidity or temperature fluctuations, as these conditions can degrade the active ingredients.
Do not use Atacand Plus after the expiry date printed on the carton and blister. The expiry date refers to the last day of that month. Do not dispose of medications in household waste or via wastewater. Ask your pharmacist about appropriate disposal methods for medications you no longer need. Proper pharmaceutical waste disposal helps protect the environment.
If your tablets look discoloured, crumbled, or otherwise altered in appearance, do not take them. Return them to your pharmacy for safe disposal and obtain a new supply.
What Does Atacand Plus Contain?
Each Atacand Plus tablet contains two active ingredients: candesartan cilexetil 8 mg and hydrochlorothiazide 12.5 mg, along with several inactive ingredients (excipients) that aid in tablet formulation, stability, and absorption.
Active Ingredients
- Candesartan cilexetil 8 mg: An angiotensin II receptor blocker (ARB). Candesartan cilexetil is a prodrug that is hydrolysed to the active form, candesartan, during absorption. It selectively and competitively blocks the angiotensin II AT1 receptor, reducing vasoconstriction and aldosterone release.
- Hydrochlorothiazide 12.5 mg: A thiazide-type diuretic that inhibits sodium and chloride reabsorption in the distal convoluted tubule of the kidney, promoting the excretion of water and electrolytes. This low dose minimises metabolic side effects while contributing to blood pressure reduction.
Inactive Ingredients (Excipients)
The inactive ingredients in Atacand Plus tablets typically include:
- Calcium carboxymethylcellulose: Used as a disintegrant to help the tablet break down in the gastrointestinal tract
- Hydroxypropyl cellulose: A binder that holds the tablet together
- Lactose monohydrate: A filler/diluent – patients with rare galactose intolerance, Lapp lactase deficiency, or glucose-galactose malabsorption should not take this medicine
- Magnesium stearate: A lubricant used in the manufacturing process
- Maize starch: Used as a filler and disintegrant
- Iron oxide (yellow and red): Colouring agents used to distinguish different tablet strengths
- Polyethylene glycol: Used in the tablet coating
Atacand Plus tablets contain lactose monohydrate as an excipient. If you have been told by your doctor that you have an intolerance to some sugars, contact your doctor before taking this medicinal product. The amount of lactose per tablet is small but may be relevant for patients with severe lactose intolerance.
Frequently Asked Questions About Atacand Plus
Atacand contains only candesartan cilexetil (an angiotensin II receptor blocker), while Atacand Plus is a combination tablet that also includes hydrochlorothiazide (a thiazide diuretic). Atacand Plus is prescribed when candesartan alone does not provide sufficient blood pressure control. The addition of hydrochlorothiazide provides a complementary mechanism of action, resulting in greater blood pressure reduction than either drug used individually. Your doctor will typically start treatment with candesartan alone and only switch to Atacand Plus if additional blood pressure lowering is needed.
In some cases, Atacand Plus may be combined with other antihypertensive medications, such as calcium channel blockers (e.g., amlodipine), under medical supervision. However, you should generally not combine Atacand Plus with ACE inhibitors (e.g., ramipril, enalapril) or direct renin inhibitors (e.g., aliskiren), as dual blockade of the renin-angiotensin system increases the risk of hypotension, hyperkalaemia, and kidney problems. Always discuss all your medications with your doctor before starting any new treatment.
Atacand Plus begins lowering blood pressure within a few hours of the first dose. The diuretic effect of hydrochlorothiazide starts within approximately 2 hours and peaks at around 4 hours. However, the full blood pressure-lowering effect of the combination may take 4 to 6 weeks of continuous daily use to develop fully. It is important to continue taking the medication as prescribed even if you feel well, as hypertension is often asymptomatic. Do not stop or change your dose without consulting your doctor.
Dizziness, particularly when standing up (orthostatic hypotension), is a common side effect, especially at the beginning of treatment or after a dose increase. If you feel dizzy, sit or lie down immediately until the feeling passes. Stand up slowly from sitting or lying positions. Make sure you are drinking enough fluids, as dehydration can worsen dizziness. Avoid alcohol, as it can amplify this effect. If dizziness persists, is severe, or is accompanied by fainting, contact your doctor, as your dose may need adjustment.
Atacand Plus can affect kidney function, particularly in patients who already have kidney problems, are dehydrated, or are taking other medications that affect the kidneys (such as NSAIDs). The candesartan component affects intrarenal haemodynamics by dilating the efferent arterioles, which can temporarily reduce glomerular filtration. Your doctor will monitor your kidney function with blood tests (creatinine, eGFR) before starting treatment and periodically thereafter. If you notice a significant decrease in urine output or unexplained swelling, contact your doctor promptly.
Yes, regular exercise is encouraged and is an important part of managing high blood pressure. However, be aware that the diuretic component of Atacand Plus increases fluid loss, so you need to stay well hydrated before, during, and after exercise. Exercising in hot weather requires extra caution, as excessive sweating combined with the diuretic effect may lead to dehydration and electrolyte imbalances. If you experience excessive dizziness, weakness, or muscle cramps during exercise, stop and rest, drink fluids, and consult your doctor if symptoms persist.
References
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- Whelton PK, Carey RM, Aronow WS, et al. 2017 ACC/AHA/AAPA/ABC/ACPM/AGS/APhA/ASH/ASPC/NMA/PCNA Guideline for the Prevention, Detection, Evaluation, and Management of High Blood Pressure in Adults. Journal of the American College of Cardiology. 2018;71(19):e127-e248.
- World Health Organization (WHO). Hypertension Fact Sheet. Available at: www.who.int. Accessed January 2026.
- National Institute for Health and Care Excellence (NICE). Hypertension in adults: diagnosis and management [NG136]. Updated 2022. Available at: www.nice.org.uk.
- Unger T, Borghi C, Charchar F, et al. 2020 International Society of Hypertension Global Hypertension Practice Guidelines. Hypertension. 2020;75(6):1334-1357.
- British National Formulary (BNF). Candesartan with hydrochlorothiazide. Available at: bnf.nice.org.uk. Accessed January 2026.
- Sica DA, Carter B, Cushman W, Hamm L. Thiazide and loop diuretics. The Journal of Clinical Hypertension. 2011;13(9):639-643.
- Barzilay JI, Davis BR, Bettencourt J, et al. Cardiovascular outcomes using doxazosin vs. chlorthalidone for the treatment of hypertension in older adults with and without glucose disorders: a report from the ALLHAT study. The Journal of Clinical Hypertension. 2004;6(3):116-125.
- FDA Drug Safety Communication. Hydrochlorothiazide skin cancer risk. U.S. Food and Drug Administration. 2020.
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