How to Take Hydrochlorothiazide: Side Effects, Dosage
Hydrochlorothiazide dosing instructions, timing guidance, common side effects, and when to contact your prescriber. Information based on FDA-approved prescribing information.
Not medical advice. Speak with a healthcare professional before using any medication.
Reviewed by:
Updated Feb, 15
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Information sourced from FDA-approved prescribing information and peer-reviewed medical references.
How to Take Hydrochlorothiazide
How to Take Hydrochlorothiazide
Per FDA-approved prescribing information, the following guidance applies to taking hydrochlorothiazide (HCTZ).
- Per FDA-approved prescribing information, typical adult dose: most adults take 12.5–25 mg once each morning. Some may be prescribed up to 50 mg once daily, as directed by their clinician.
- Per FDA-approved prescribing information, when to take it: take it in the morning. It increases urination, so morning dosing helps avoid nighttime bathroom trips.
- Per FDA-approved prescribing information, how to take it: swallow the tablet with a glass of water. It may be taken with or without food.
- Hydration: drink water regularly through the day as directed by your clinician.
- Per FDA-approved prescribing information, if you miss a dose: if you remember within a few hours, take it. If it is later in the day, skip it to avoid nighttime urination and take your next dose the following morning.
- Per FDA-approved prescribing information, consistency matters: take it at the same time each day.
- Do not double up: if a dose is missed, do not take extra tablets.
- Monitoring: your clinician may check blood pressure and electrolytes as part of your treatment plan.
Warnings Before Taking Hydrochlorothiazide
- Per FDA-approved prescribing information: avoid if allergic to sulfa-type drugs.
- Per FDA-approved prescribing information: tell your doctor about kidney, liver, or gout history.
- Per FDA-approved prescribing information: use caution with low potassium or sodium levels.
- Per FDA-approved prescribing information: discuss use if you have diabetes or take lithium.
- Per FDA-approved prescribing information: inform your clinician if you are pregnant or planning pregnancy.
- Per FDA-approved prescribing information: avoid use with severe dehydration.
Hydrochlorothiazide Side Effects
Common
Mild
Dizziness
Per FDA-approved prescribing information, dizziness can occur as hydrochlorothiazide lowers blood pressure. Rise slowly from sitting or lying positions to reduce lightheadedness.
Per FDA-approved prescribing information. Contact your prescriber if side effects persist or worsen.
Normally lasts for:
1–3 hours
Common
Mild
Increased Urination
Per FDA-approved prescribing information, this medication works as a diuretic, so more frequent urination is expected, particularly during the first few hours after a dose.
Per FDA-approved prescribing information. Contact your prescriber if side effects persist or worsen.
Normally lasts for:
4–6 hours
Common
Moderate
Low Potassium
Per FDA-approved prescribing information, hydrochlorothiazide may lower potassium levels, which can cause muscle weakness, fatigue, or cramps. Your clinician may monitor labs or recommend dietary adjustments.
Per FDA-approved prescribing information. Contact your prescriber if side effects persist or worsen.
Normally lasts for:
24–48 hours
Uncommon
Moderate
Low Sodium
Per FDA-approved prescribing information, some people develop sodium loss, which can cause headache, confusion, or general malaise. Report symptoms to your prescriber.
Per FDA-approved prescribing information. Contact your prescriber if side effects persist or worsen.
Normally lasts for:
24–48 hours
Uncommon
Mild
Photosensitivity
Per FDA-approved prescribing information, this medicine can increase skin sensitivity to sunlight, raising the chance of a sunburn or rash. Use sun protection as directed.
Per FDA-approved prescribing information. Contact your prescriber if side effects persist or worsen.
Normally lasts for:
12–24 hours
Common
Mild
Upset Stomach
Per FDA-approved prescribing information, some people notice nausea or mild stomach discomfort. Taking the dose with a small snack may reduce stomach irritation.
Per FDA-approved prescribing information. Contact your prescriber if side effects persist or worsen.
Normally lasts for:
1–3 hours
Contact Us for a Personalized Care Plan
Have questions about compounding? Contact Voshell's Pharmacy — we prepare patient-specific medications pursuant to valid prescriptions from your licensed prescriber.
What If You Forgot to Take Hydrochlorothiazide
If You Forgot to Take Hydrochlorothiazide
Per FDA-approved prescribing information, if you miss a dose, take it as soon as you remember — unless it is close to your next scheduled dose. In that case, skip the missed dose and resume your regular schedule.
- Do not double up; taking extra doses can cause unnecessary drops in blood pressure or increased urination.
- Per FDA-approved prescribing information, if you remember late in the day, waiting until the next usual morning dose reduces the risk of nighttime urination.
What If You Took Too Much Hydrochlorothiazide
What If You Took Too Much Hydrochlorothiazide?
Call Poison Control at 1-800-222-1222 immediately for guidance on next steps.
Per FDA-approved prescribing information, hydrochlorothiazide overdose may cause severe drops in blood pressure, electrolyte imbalances, excessive urination, dizziness, weakness, or muscle cramps. If symptoms are severe, call 911 or go to the nearest emergency room.
How Much Does Hydrochlorothiazide Cost
Cost of Hydrochlorothiazide With Insurance
With most U.S. insurance plans, hydrochlorothiazide is typically covered as a low-tier generic. Copay amounts vary by plan, pharmacy, and tier placement. Ask your pharmacy to verify your specific copay. Pricing information is not a guarantee of cost; contact your insurer or pharmacy for current pricing.
How Much Does Hydrochlorothiazide Cost without Insurance
Cost of Hydrochlorothiazide Without Insurance
Hydrochlorothiazide is widely available as a generic medication. Prices vary by pharmacy, dose, and quantity. Many pharmacies offer low-cost generic programs. Pricing information is not a guarantee of cost; contact your pharmacy for current out-of-pocket pricing.
Resources:
https://medlineplus.gov/druginfo/meds/a682571.html
https://www.nhs.uk/medicines/hydrochlorothiazide/
https://www.mayoclinic.org/drugs-supplements/hydrochlorothiazide-oral-route/description/drg-20071841
https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=eb7f347e-fbb4-4e78-9d85-b7a760ef7df8
https://www.accessdata.fda.gov/drugsatfda_docs/label/2012/040344s016lbl.pdf
