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Spironolactone HCTZ is an oral combination diuretic used to help manage high blood pressure and fluid retention. It combines spironolactone with hydrochlorothiazide in one tablet, and you can choose the available strength that matches your clinician’s directions when placing an order. This medicine is supplied through licensed pharmacies, with US delivery from Canada available for appropriate orders.
Price, Strengths, and Ordering
Spironolactone HCTZ price can vary by tablet strength, quantity, manufacturer, and supply. During ordering, choose the strength shown for the medicine and match it to the directions from your healthcare professional. If you are paying out of pocket or buying without insurance, viewing the current cost before checkout can help you plan refills and avoid gaps in therapy.
Commonly referenced strengths for Aldactazide tablets include spironolactone/hydrochlorothiazide 25/25 mg and 50/50 mg. The existing stocked presentation may vary, so use the strength displayed during ordering rather than assuming every published strength is available. Your clinician determines whether a fixed-dose combination is suitable, and whether a separate spironolactone or thiazide medicine would be a better fit.
Quick tip: Keep your tablet label, refill schedule, and current lab schedule together so you can answer medication questions accurately.
What This Combination Treats
Spironolactone HCTZ tablets are used for hypertension, which means high blood pressure, and for edema, which means excess fluid buildup. Edema may occur with conditions such as congestive heart failure, liver cirrhosis, or certain kidney-related disorders. For background on blood pressure goals and risk factors, see our hypertension condition information.
This medicine does not treat every cause of swelling. New or worsening swelling, shortness of breath, chest pain, or rapid weight changes should be assessed promptly because fluid retention can signal a serious heart, liver, kidney, or circulation problem. You can also read more about fluid buildup in our edema condition information.
How Spironolactone and HCTZ Work Together
Spironolactone and HCTZ are not the same medicine. Spironolactone is a potassium-sparing diuretic that blocks aldosterone, a hormone that can make the body retain salt and water. Hydrochlorothiazide, often shortened to HCTZ, is a thiazide diuretic that helps the kidneys remove extra sodium and water through urine.
The combination is sometimes known by the brand name Aldactazide. Generic Aldactazide contains the same two active ingredients, but appearance and manufacturer may differ. The key product decision is whether your clinician wants both diuretic actions in a single tablet rather than separate medicines.
Using both ingredients can be helpful because hydrochlorothiazide may lower potassium in some people, while spironolactone may raise potassium. The balance is useful for some patients, but it also makes lab monitoring important. Potassium, sodium, kidney function, and blood pressure readings help your healthcare professional judge whether the medicine remains appropriate.
How to Take the Tablets
Take Spironolactone HCTZ exactly as directed by your clinician. Many people take diuretics earlier in the day because they can increase urination. If your schedule or work hours make that difficult, ask your healthcare professional how to time the dose safely without changing the amount taken.
Swallow tablets with water. They may be taken with or without food, although food may help if stomach upset occurs. Do not double up after a missed dose unless a healthcare professional specifically tells you to do so. If you forget a dose and it is almost time for the next one, skip the missed dose and return to the usual schedule.
Avoid potassium supplements, potassium-containing salt substitutes, or major diet changes unless your clinician has approved them. Many patients do not need to avoid all potassium-rich foods, but some need individualized limits based on kidney function, other medicines, and blood test results.
Side Effects, Warnings, and Monitoring
Common side effects of spironolactone and hydrochlorothiazide may include increased urination, dizziness, lightheadedness, headache, nausea, stomach discomfort, or tiredness. Some people notice muscle cramps, menstrual changes, breast tenderness, or breast enlargement. Hydrochlorothiazide can make the skin more sensitive to sunlight, so sun protection is practical if you burn easily or develop a rash.
Serious problems can occur when fluid or electrolytes shift too far. Contact a healthcare professional urgently for fainting, severe weakness, confusion, irregular heartbeat, severe vomiting or diarrhea, very low urine output, swelling of the face or throat, or trouble breathing. These symptoms may suggest dehydration, kidney problems, an allergic reaction, or abnormal potassium or sodium levels.
This medicine may be unsuitable for people with high potassium, severe kidney impairment, Addison’s disease, significant dehydration, or allergy to either ingredient. People with diabetes, gout, liver disease, kidney disease, lupus, low sodium, or a history of sulfa sensitivity may need closer monitoring. Pregnancy, plans for pregnancy, or breastfeeding should be discussed with a healthcare professional before use.
Important interactions can occur with ACE inhibitors, ARBs, other potassium-sparing diuretics, potassium supplements, lithium, digoxin, nonsteroidal anti-inflammatory drugs, certain steroids, and other blood pressure medicines. Alcohol may increase dizziness. Vitamin B12 is not generally considered a major interaction with spironolactone HCTZ, but supplements should still be listed with all medicines so your clinician can assess the full picture.
Storage, Refills, and Travel
Store tablets at room temperature in a dry place, away from excess heat and moisture. Keep the medicine in its original labeled container and out of reach of children or pets. Bathrooms are often too humid for tablet storage, even when a medicine cabinet seems convenient.
For travel, carry tablets in hand luggage with the labeled container. Bring enough supply for the trip, plus a small buffer if your clinician agrees. Border crossings and airport screening are usually easier when the medicine remains in its original container with your name and dosing directions visible.
Refill timing matters with blood pressure and edema medicines because stopping suddenly can allow symptoms or pressure readings to worsen. If you use prompt, express shipping, plan ahead rather than waiting until only a few tablets remain. Longer fills may reduce refill stress when your treatment plan is stable.
Benefits and Practical Expectations
The main convenience of Spironolactone HCTZ is that two diuretic ingredients are combined in one tablet. A simpler routine may help some people take medication consistently, especially when several daily medicines are already part of the plan. Blood pressure changes often require repeated readings over time, not a single isolated number.
Edema may improve as the body removes extra salt and water, but this medicine is not intended as a weight-loss drug. Any early weight change is usually related to fluid balance rather than fat loss. Rapid weight gain, rapid weight loss, or dizziness when standing should be discussed because these changes may signal too much or too little fluid removal.
Why it matters: Diuretics work best when medication use, lab monitoring, and follow-up visits stay aligned.
Comparing Nearby Treatment Choices
Some patients use separate diuretic tablets instead of a fixed-dose combination. Others may use a different blood pressure class if potassium changes, kidney function, cough, swelling, or dizziness becomes a concern. Your clinician may consider the cause of edema, blood pressure goals, other conditions, and lab values before adjusting therapy.
If spironolactone alone is being considered, see spironolactone tablets. For people whose plan involves a blood pressure medicine paired with a thiazide diuretic, related options include lisinopril HCTZ and candesartan HCTZ. Some treatment plans include calcium channel blockers such as nifedipine XR.
Cardiovascular therapy is often individualized, and combinations may change over time. To browse heart and blood pressure medicines by category, visit cardiovascular products. For education on related heart and circulation topics, the cardiovascular article category may help you prepare questions for your next visit.
Questions to Discuss With Your Healthcare Professional
- Which Spironolactone HCTZ strength should I use, and when should I take it?
- How often should potassium, sodium, creatinine, and blood pressure be monitored?
- Should I avoid potassium supplements, salt substitutes, NSAIDs, or alcohol?
- What symptoms suggest dehydration, high potassium, or low sodium?
- Would separate tablets give more flexibility than a fixed-dose combination?
- What should I do if vomiting, diarrhea, or poor fluid intake lasts more than a day?
Authoritative Sources
Mayo Clinic medicine description
This content is for informational purposes only and is not a substitute for professional medical advice.
Blood Pressure Average Calculator
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Estimate kidney filtration using the 2021 CKD-EPI creatinine equation.
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Estimate creatinine clearance using the Cockcroft-Gault equation.
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Corrected Sodium Calculator
Estimate sodium corrected for hyperglycemia using common 1.6 and 2.4 correction factors.
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Estimate calculated serum osmolality from sodium, glucose, and BUN or urea.
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What is Spironolactone HCTZ used for?
Spironolactone HCTZ is used to help treat high blood pressure and fluid retention. Edema may be related to conditions such as heart failure, liver cirrhosis, or certain kidney disorders. Your clinician decides whether the combination fits your diagnosis, lab results, and other medicines.
Are spironolactone and HCTZ the same?
No. Spironolactone is a potassium-sparing diuretic, while hydrochlorothiazide, or HCTZ, is a thiazide diuretic. They help remove extra fluid in different ways, and the combination may help balance potassium effects for some patients.
What are common side effects of Spironolactone HCTZ?
Common side effects may include increased urination, dizziness, lightheadedness, headache, nausea, stomach upset, tiredness, muscle cramps, breast tenderness, or menstrual changes. Contact a healthcare professional for fainting, severe weakness, irregular heartbeat, swelling of the face or throat, or trouble breathing.
Can I take vitamin B12 with Spironolactone HCTZ?
Vitamin B12 is not generally considered a major interaction with this combination. Still, tell your healthcare professional about all vitamins, supplements, and medicines you take, because potassium products, NSAIDs, lithium, ACE inhibitors, ARBs, and other diuretics may require closer review.
Does Spironolactone HCTZ cause weight loss?
Any weight change is usually related to fluid loss, not fat loss. This medicine is not a weight-loss treatment. Rapid weight gain, rapid weight loss, dizziness, or reduced urination should be discussed with a healthcare professional because fluid balance may need assessment.
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