Chlorthalidone: Side Effects, Uses & Monitoring

Atenolol and Chlorthalidone Tablets, USP are indicated for the treatment of hypertension, to lower blood pressure.

Data source
FDA labeling via NIH DailyMed (label db22ff31…)
Label version
current
Last reviewed
2026
Side effects

Reported adverse reactions

Reactions listed in current FDA labeling, with the highest frequency reported across summarized placebo-controlled trials.

Adverse reaction (as reported in labeling)Reported frequency*
Tiredness26%
Dizziness13%
Coldextremities12%
Depression12%
Fatigue6%
Dyspnea6%
Posturalhypotension5%
Nausea4%
Bradycardia3%
Legpain3%
Light-headedness3%
Lethargy3%
Dreaming3%
Diarrhea3%
Wheeziness3%
Vertigo2%
Drowsiness2%

*Highest percentage reported for the active moiety across placebo-controlled trial tables in current FDA labeling. Values reflect trial reporting, not your individual risk.

Uses

Labeled uses (from FDA prescribing information)

Atenolol and Chlorthalidone Tablets, USP are indicated for the treatment of hypertension, to lower blood pressure. Lowering blood pressure lowers the risk of fatal and non-fatal cardiovascular events, primarily strokes and myocardial infarctions. These benefits have been seen in controlled trials of antihypertensive drugs from a wide variety of pharmacologic classes including atenolol and chlorthalidone. Control of high blood pressure should be part of comprehensive cardiovascular risk management, including, as appropriate, lipid control, diabetes management, antithrombotic therapy, smoking cessation, exercise, and limited sodium intake. Many patients will require more than 1 drug to achieve blood pressure goals. For specific advice on goals and management, see published guidelines, such as those of the National High Blood Pressure Education Program’s Joint National Committee on Prevention, Detection, Evaluation, and Treatment of High Blood Pressure (JNC). Numerous antihypertensive drugs, from a variety of pharmacologic classes and with different mechanisms of action, have been shown in randomized controlled trials to reduce cardiovascular morbidity and mortality, and it can be con…

Related conditions

Conditions associated with Chlorthalidone in labeling

FAQ

Frequently Asked Questions

What is Chlorthalidone used for?

FDA labeling lists the approved uses shown above under "Labeled uses." This summary is informational; only a qualified prescriber can determine whether a medication is appropriate for you.

What are the most commonly reported side effects of Chlorthalidone?

The table above shows adverse reactions and the highest frequencies reported in placebo-controlled trials summarized in current FDA labeling for Chlorthalidone. Individual risk varies.

Does Chlorthalidone require lab monitoring?

Monitoring needs vary. Ask your healthcare provider whether any lab tests apply while taking Chlorthalidone.

Where does this information come from?

All clinical facts on this page were extracted from the current FDA-registered product labeling for this ingredient, published by manufacturers through NIH DailyMed. See the source link below.

Medical disclaimer: Educational content extracted from public FDA labeling. Not medical advice. Always consult a qualified healthcare professional before starting, stopping, or changing any medication.

Educational content only: The information on Symptom Database.com is for educational purposes and is not medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider. Read our full disclaimer.