Care that knows when HCTZ is the right add-on, and when it's the wrong one.
HCTZ pairs well with an ACE inhibitor or ARB but raises uric acid and can drop potassium. Clara reads your labs, gout history, and meds, then drafts the right plan.
If our physician prefers HCTZ despite the gout, I'll draft an allopurinol plan and the follow-up BMP at 2 weeks.
HCTZ prescribed from your labs, not a checklist.
Connect your chart
Clara auto-syncs your records from 150,000+ doctors' offices, hospitals, labs, and wearable devices. Gout history, A1c, potassium, sodium, creatinine, uric acid — all read. Free.
Clara reasons across your full context
Clara screens for thiazide gotchas (gout, diabetes, low sodium, low potassium, sulfa allergy, NSAID use, skin-cancer history) and drafts the right dose, or a better alternative. A licensed physician reviews and signs off.
Follow-up labs, on a clock
Clara drafts a BMP at 2 to 4 weeks after starting or escalating HCTZ to catch potassium or sodium drift, and watches it without a new visit.
Try Clara before you fill your next HCTZ refill.
Starting doses, the combinations that work, and when to pick something else.
HCTZ 12.5 mg daily
Most BP benefit shows up at 12.5 to 25 mg once daily; higher doses add more metabolic side effects than BP lowering1.
HCTZ + lisinopril (Zestoretic)
A widely used single-pill combination. The ACE inhibitor offsets thiazide-induced potassium drop and the two work on complementary mechanisms.
HCTZ + losartan (Hyzaar)
Preferred when ACE-inhibitor cough is a problem. Same potassium-sparing logic as the ACE combo, with ARB benefits in diabetic nephropathy3.
Chlorthalidone
Longer-acting thiazide-like diuretic. ALLHAT was built on chlorthalidone, and some evidence favors it over HCTZ for CV outcomes2. Clara drafts chlorthalidone when your chart supports it.
Gout, severe kidney disease, sulfa allergy
HCTZ can precipitate gout, is less effective at eGFR <30, and is a sulfonamide (cross-reactivity is rare but noted). Clara flags these from your chart and drafts an alternative before the order is called in1.
Skin cancer watch
The FDA updated the HCTZ label to note increased risk of non-melanoma skin cancer with long-term use; Clara flags if you have prior skin-cancer history and recommends sun protection and dermatology follow-up1.
A thiazide that knows your gout history and your uric acid. Can your old doctor read your entire chart every time?
| Clara | GoodRx Care | Circle Medical | Your doctor | |
|---|---|---|---|---|
| 24/7 AI clinical chat with full-chart reasoning | Unlimited | Per-visit only | Visit-based | ✗ |
| Auto-screens gout, A1c, eGFR, skin-cancer before Rx | Every time | Manual at visit | Manual at visit | Dependent on time |
| Cost to start | Free (connect records + chat) | $49 per BP refill visit | $179 first visit self-pay | $150+ copay |
| Paid plans | $25/mo membership, HSA/FSA eligible | No membership, $49/visit ($19 w/ GoodRx Gold) | No membership, $120 follow-up self-pay | Per-visit copay |
| Prescription fills | FDA-approved generic, may be covered by your insurance | Sent to your pharmacy | Sent to your pharmacy | Sent to your pharmacy |
| Follow-up electrolytes at 2–4 weeks | Drafted automatically | Separate visit | Ordered at visit | Copay applies |
| Full primary care in one membership | Single-visit refill |
GoodRx Care writes the refill. Clara reads the uric acid, the last BMP, and every skin-cancer flag on your chart.
The oldest BP drug, handled with the newest reasoning.
Thiazides are the cheapest and most-studied antihypertensives in the world. They also have a handful of drug-specific gotchas that do not fit in a 15-minute visit. Clara handles them automatically, every time.
Gout, diabetes, low sodium, auto-flagged
Your chart has a 2022 gout flare, an A1c of 6.2, or a baseline sodium of 134. Clara pulls it up and drafts a non-thiazide alternative before you end up in the ER with a flare or a hyponatremia admission.
Potassium drift, watched
Clara drafts a follow-up BMP at 2 to 4 weeks and auto-reads it. If potassium dips below 3.5, Clara flags — often a switch to an ACE/ARB-combined pill that evens it back out, without an extra visit.
Chlorthalidone vs HCTZ, from your data
Some patients do better on chlorthalidone based on ALLHAT-era evidence and their chart specifics. Clara flags the choice with the reasoning already laid out, rather than defaulting to whatever is in the EMR drop-down.
Care that reads every BMP and every gout flare against your full chart.
Common questions
HCTZ questions patients ask.
How is Clara different from a single refill visit?
Why does HCTZ cause low potassium?
Is 12.5 mg enough, or do I need 25 mg?
Is chlorthalidone a better thiazide?
Does HCTZ really raise skin cancer risk?
Is Clara a real medical practice?
What does Clara cost, and can I use insurance?
Can I use Clara for other health issues too?
The thiazide gets prescribed with your labs in the reasoning, not after.
Connect your records, chat with Clara for free, and see whether HCTZ (or something else) is the right add-on for your chart.
Get startedHydrochlorothiazide labeled risks include hypokalemia, hyponatremia, hypomagnesemia, hyperuricemia and gout, hyperglycemia, acute angle-closure glaucoma, idiosyncratic acute pulmonary toxicity, and (with long-term use) increased risk of non-melanoma skin cancer. Use caution in sulfonamide sensitivity.
For important safety information about hydrochlorothiazide, see the FDA Medication Guide and prescribing information: Hydrochlorothiazide. For mentioned alternatives, see Lisinopril, Losartan, and Amlodipine.
1Microzide (hydrochlorothiazide) capsules: FDA-approved prescribing information. Dosing from Section 2 (12.5 mg to 50 mg daily for hypertension). Warnings and precautions from Sections 5 and 6: electrolyte imbalance, acute transient myopia and angle-closure glaucoma, hyperuricemia/gout, new-onset diabetes, and non-melanoma skin cancer with long-term use. View DailyMed labels.
2ALLHAT Officers and Coordinators. Major outcomes in high-risk hypertensive patients randomized to ACE inhibitor or calcium channel blocker vs. diuretic. JAMA. 2002;288(23):2981–2997. In 33,357 participants, chlorthalidone was superior to or similar to amlodipine and lisinopril on primary and key secondary outcomes. View on PubMed.
3Brenner BM, Cooper ME, de Zeeuw D, et al. Effects of losartan on renal and cardiovascular outcomes in patients with type 2 diabetes and nephropathy. N Engl J Med. 2001;345(12):861–869. RENAAL: losartan reduced the composite of doubling of creatinine, ESRD, or death by 16% vs. placebo added to conventional therapy. View on PubMed.
4Ishani A, Cushman WC, Leatherman SM, et al. Chlorthalidone vs hydrochlorothiazide for hypertension–cardiovascular events. N Engl J Med. 2022;387(26):2401–2410 (VA Diuretic Comparison Project). No significant difference in composite CV outcome; chlorthalidone showed higher rates of hypokalemia. View on PubMed.