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More from Atechlor

Other strengths and forms by Silva Pharmaceuticals Ltd.

Indications & Uses

Atechlor is indicated for:

Pharmacology

Atenolol and chlorthalidone have each been used on their own and together for treating high blood pressure. Studies show that combining them into a single tablet does not affect how well either drug is absorbed, so this combination offers a convenient way to take both medicines at once. Atenolol is a beta1-selective (cardioselective) beta-blocker: it lowers the heart rate both at rest and during exercise, reduces cardiac output, lowers systolic and diastolic blood pressure at rest and during exercise, and lessens the reflex rise in heart rate that occurs on standing (reflex orthostatic tachycardia). Chlorthalidone is a monosulfonamyl diuretic with a long duration of action and low toxicity. It increases urine output by markedly boosting the excretion of sodium and chloride at the distal convoluted tubule of the nephron.

Dosage Reference

Reference Information Only

Dosages shown are general references from official sources. Always consult your doctor or pharmacist for personalized dosing.

Adults:

The usual starting dose is Atenolol 50 mg combined with Chlorthalidone 25 mg, taken once daily. If blood pressure is not adequately controlled, another antihypertensive medicine may be added gradually, starting at about half the usual recommended starting dose, to prevent blood pressure from falling too sharply. Since Atenolol is cleared from the body by the kidneys, the dose should be adjusted for patients with severely impaired kidney function. Regarding use in the elderly: clinical studies of the Atenolol and Chlorthalidone combination did not enroll enough patients aged 65 and over to establish whether they respond differently than younger patients.

Side Effects

Atechlor produces side effects similar to those of its individual components. Atenolol: bradycardia, cold extremities, postural hypotension, leg pain, dizziness, vertigo, lightheadedness, tiredness, fatigue, lethargy, drowsiness, depression, dreaming, diarrhea, nausea, wheeziness, and dyspnea. Chlorthalidone: orthostatic hypotension, anorexia, gastric irritation, vomiting, cramping, constipation, vertigo, purpura, photosensitivity, rash, urticaria, hyperglycemia, glycosuria, hyperuricemia, muscle spasm, weakness, and restlessness.

Cautions & Contraindications

Warnings & Precautions

Atechlor should be used with caution in patients with peripheral arterial circulatory disorders, as it may worsen these conditions. Serum electrolyte levels should also be checked periodically to catch any imbalance early.

Contraindications

Atenolol + Chlorthalidone should not be used if a patient is hypersensitive to this combination or to sulfonamide-derived drugs. It is also unsuitable for patients with sinus bradycardia, heart block beyond the first degree, cardiogenic shock, overt heart failure, or anuria.

Pregnancy & Breastfeeding

Pregnancy Category D. This medicine should be used with caution in women who are breastfeeding.

⚠️ Talk to your doctor before taking any medicine during pregnancy or while breastfeeding.

Overdose

There is no specific information on what happens when a person takes too much Atenolol + Chlorthalidone. Treatment should be symptomatic and supportive. It should also aim to remove any drug that has not yet been absorbed, either by inducing vomiting or by giving activated charcoal. Atenolol can be cleared from the general circulation by hemodialysis. Dehydration, electrolyte imbalance and hypotension should also be considered and managed by established procedures.

⚠️ In an emergency call 999 or go to the nearest hospital emergency department.

Storage

Keep Atenolol + Chlorthalidone in a cool, dry place, away from light.

Drug Interactions

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Common questions about Atechlor 50 mg

What is Atechlor 50 mg Tablet?

Atechlor 50 mg Tablet is a medicine that contains Atenolol + Chlorthalidone. It is made by Silva Pharmaceuticals Ltd. It belongs to the Combined antihypertensive preparations group of medicines.

What is Atechlor used for?

Atechlor is used for: Hypertension.

What are the side effects of Atechlor?

Atechlor produces side effects similar to those of its individual components. Atenolol: bradycardia, cold extremities, postural hypotension, leg pain, dizziness, vertigo, lightheadedness, tiredness, fatigue, lethargy, drowsiness, depression, dreaming, diarrhea, nausea, wheeziness, and dyspnea.

Can I take Atechlor during pregnancy or while breastfeeding?

Pregnancy Category D. This medicine should be used with caution in women who are breastfeeding. Talk to your doctor before taking any medicine during pregnancy or while breastfeeding.

What happens if I take too much Atechlor?

There is no specific information on what happens when a person takes too much Atenolol + Chlorthalidone. Treatment should be symptomatic and supportive. In an emergency call 999 or go to the nearest hospital emergency department.

How should I store Atechlor?

Keep Atenolol + Chlorthalidone in a cool, dry place, away from light.

Can I take other medicines with Atechlor?

Some medicines can interact with Atenolol + Chlorthalidone, for example: Indomethacin, Amiodarone Hydrochloride. Tell your doctor or pharmacist about every medicine you take.

Do I need a prescription for Atechlor?

Atechlor is a prescription (Rx) medicine. Take it as your doctor advises.

Last updated: 15 Aug 2026