Comprehensive medication guide to Chlorthalidone including estimated pricing, availability information, side effects, and how to find it in stock at your local pharmacy.
Estimated Insurance Pricing
$0–$30 copay per month for generic chlorthalidone; it is Tier 1–2 on most commercial insurance and Medicare Part D plans. Prior authorization is rarely required. Medicaid also covers it on most state formularies.
Estimated Cash Pricing
$7–$46 per month at retail for generic chlorthalidone; as low as $2–$7 with a GoodRx or SingleCare coupon for a 30-day supply. Brand-name Thalitone costs $116–$145 per month.
Medfinder Findability Score
82/100
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Chlorthalidone is a prescription thiazide-like diuretic (water pill) used to treat high blood pressure (hypertension) and fluid retention (edema). It has been FDA-approved since 1960 and is considered a first-line treatment for hypertension by major cardiology guidelines.
Chlorthalidone is available as generic tablets in 12.5 mg, 25 mg, and 50 mg strengths. It is also available under the brand names Thalitone and Hemiclor, though most prescriptions are filled as generic. The original brand Hygroton has been discontinued.
Chlorthalidone is not a controlled substance and has no addiction potential. It is prescribed by primary care physicians, cardiologists, nephrologists, and other providers as part of a comprehensive blood pressure management plan.
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Chlorthalidone works by blocking the sodium-chloride symporter (NCC pump) in the distal convoluted tubule of the kidney. This prevents the kidney from reabsorbing sodium and chloride back into the bloodstream. When sodium stays in the kidney tubule, water follows it by osmosis, and both are excreted as urine.
The resulting reduction in blood volume lowers blood pressure. Over weeks to months, chlorthalidone also causes blood vessels to relax (vasodilation), providing additional sustained blood pressure reduction beyond the initial fluid loss.
Chlorthalidone has a notably long half-life of 40–60 hours — much longer than hydrochlorothiazide (8–15 hours). This provides consistent 24-hour blood pressure control with once-daily dosing, including critical early-morning hours when cardiovascular risk is highest. Effects last 48–72 hours per dose.
12.5 mg — tablet
Lower starting dose; also available as brand Hemiclor
25 mg — tablet
Most commonly prescribed dose for hypertension
50 mg — tablet
Higher dose used for edema management; also used for hypertension when lower doses are insufficient
Generic chlorthalidone is generally available nationwide and is not listed on the FDA's official Drug Shortage Database as of 2026. However, patients sometimes encounter stockouts at individual pharmacies due to just-in-time inventory systems, concentrated generic manufacturing, and growing prescribing demand driven by updated clinical guidelines.
If your regular pharmacy doesn't have it, trying an independent pharmacy, a warehouse club pharmacy (Costco, Sam's Club), or requesting a special order often resolves the issue within 1–2 business days. Mail-order pharmacy is also a reliable option for this maintenance medication.
For the fastest results, use medfinder to quickly identify which pharmacies near you have chlorthalidone in stock — without spending time on hold.
Chlorthalidone is not a controlled substance, so no special DEA registration is required. Any licensed prescriber with full prescribing authority can order it for appropriate patients.
Primary Care Physicians (Family Medicine, Internal Medicine)
Cardiologists
Nephrologists
Geriatricians
Nurse Practitioners (NPs) — in most states
Physician Assistants (PAs) — in most states
Chlorthalidone can be prescribed via telehealth in all 50 states. Hypertension is well-suited to remote management — blood pressure can be monitored with a home cuff and labs reviewed remotely. Telehealth platforms such as Teladoc, MDLive, and Amwell can prescribe chlorthalidone for established hypertension management.
No. Chlorthalidone is not a controlled substance and has no DEA scheduling. It has no addiction or abuse potential. Any licensed prescriber with prescribing authority can order chlorthalidone without special DEA registration, including nurse practitioners and physician assistants in most states.
There are no special restrictions on refills beyond standard prescription policy. Most insurers allow 90-day supplies, and mail-order pharmacy is fully available for this medication. Chlorthalidone can also be prescribed via telehealth in all 50 states.
Increased urination (expected diuretic effect)
Dizziness, especially when standing up quickly (orthostatic hypotension)
Headache
Muscle cramps or weakness (may indicate low potassium)
Photosensitivity (sun sensitivity)
Nausea or stomach upset
Hypokalemia (low potassium): muscle cramps, weakness, irregular heartbeat
Hyponatremia (low sodium): confusion, extreme weakness, excessive thirst
Hyperuricemia / gout attacks: sudden severe joint pain
Hyperglycemia: increased blood sugar (especially in patients with diabetes)
Acute kidney injury: decreased urination
Severe allergic reaction (sulfonamide hypersensitivity): hives, difficulty breathing, facial swelling — call 911
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Hydrochlorothiazide (HCTZ)
Most widely prescribed thiazide diuretic; shorter half-life than chlorthalidone but similar mechanism; generic, very affordable (~$4–$18/month)
Indapamide
Thiazide-like diuretic with additional vasodilatory properties; maintains efficacy in patients with CKD (GFR < 30 mL/min)
Furosemide (Lasix)
Loop diuretic; more potent diuretic effect; used primarily for significant edema in heart failure rather than routine hypertension
Spironolactone (Aldactone)
Potassium-sparing diuretic; used in resistant hypertension and heart failure; preserves potassium unlike chlorthalidone
Prefer Chlorthalidone? We can find it.
Lithium
majorChlorthalidone reduces renal clearance of lithium, increasing risk of toxicity. Requires close lithium level monitoring.
Digoxin (Lanoxin)
majorHypokalemia caused by chlorthalidone increases digoxin toxicity risk. Monitor potassium and digoxin levels.
NSAIDs (ibuprofen, naproxen)
moderateNSAIDs reduce antihypertensive and diuretic effects of chlorthalidone. Use acetaminophen instead where possible.
Corticosteroids (prednisone)
moderateConcurrent use increases risk of hypokalemia (low potassium).
Diabetes medications (insulin, oral hypoglycemics)
moderateChlorthalidone can raise blood glucose, reducing effectiveness of diabetes medications. Dose adjustments may be needed.
Other antihypertensives
moderateAdditive blood pressure lowering can cause hypotension, especially when dose is changed.
Chlorthalidone is a time-tested, guideline-recommended first-line treatment for high blood pressure that offers excellent efficacy at a very low cost. Its 40–60 hour half-life provides superior 24-hour blood pressure control compared to hydrochlorothiazide, and decades of clinical trial data — including the landmark ALLHAT trial — support its use for cardiovascular risk reduction.
While not in an official FDA shortage, localized stockouts at individual pharmacies do occur. Patients who encounter availability challenges should try independent pharmacies, request special orders, explore mail-order options, or ask their prescriber about a short-term alternative diuretic bridge.
If you're having difficulty finding chlorthalidone at your pharmacy, medfinder calls pharmacies near you to find which ones have it in stock and texts you the results — making it easier to get your prescription filled without the frustration of calling around yourself.
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Our medication guides are researched and written to help patients make informed decisions. All content is reviewed for accuracy and updated regularly. Learn more about our standards
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