Telmisartan 80 mg + Chlorthalidone 12.5 mg tablet is used to treat high blood pressure and swelling, sometimes off‑label for kidney stones or resistant hypertension; it works by restricting the accumulation of salt in the kidneys, so more salt and water are flushed out, lowering pressure and fluid. Common side effects of Telmisartan 80 mg + Chlorthalidone 12.5 mg are frequent urination, dizziness, headache, fatigue, nausea, constipation, low potassium, sun sensitivity, gout, and high blood sugar. Alcohol, NSAIDs, and lithium can interfere with its action, while low‑salt diets or potassium supplements may be advised. Extra care is needed in older adults, people with diabetes, gout, or liver/kidney problems. Overdose occurs at 200 to 400 mg and can cause severe dehydration, dangerously low blood pressure, electrolyte collapse, and heart rhythm disturbances requiring urgent medical care.

Telmisartan 80 mg + Chlorthalidone 12.5 mg is an oral medicine belonging to the category of diuretics. Telmisartan 80 mg + Chlorthalidone 12.5 mg is used for the management of high blood pressure and to control swellings related to it.

More Common

1. Urination  
2. Dizziness 
3. Headache 
4. Fatigue 
5. Nausea 
6. Constipation 
7. Hypokalemia 
8. Photosensitivity 
9. Gout 
10. Hyperglycemia 

Less Common 

1. Rash  
2. Itching 
3. Photosensitivity (skin reactions beyond sunburn) 
4. Muscle cramps 
5. Weakness 
6. Impotence 
7. Insomnia 
8. Restlessness 
9. Pancreatitis 
10. Jaundice 

Telmisartan 80 mg + Chlorthalidone 12.5 mg tablet works by reducing the action of angiotensin, a chemical in the body that causes blood vessels to constrict. By lowering its effect, the blood vessels relax, helping to reduce high blood pressure. Another component, chlorthalidone, helps remove excess salt and water from the body, further aiding in blood pressure control.

Pregnancy

 The safety of Telmisartan 80 mg + Chlorthalidone 12.5 mg in pregnancy is not established, and it can cause jaundice, low platelet counts, and diarrhea in patients. Inform your doctor if you are pregnant or planning to conceive.

Breastfeeding

Telmisartan 80 mg + Chlorthalidone 12.5 mg is not usually recommended during breastfeeding because there is no reliable information on whether it passes into breast milk or how it might affect a nursing infant. So, consult a doctor before using it.

Kidney and Liver Problems

Telmisartan 80 mg + Chlorthalidone 12.5 mg should be avoided in severe kidney or liver disease. Weak kidneys may cause dehydration and electrolyte imbalance. Severe liver problems may disturb fluid balance and trigger coma. So, consult a doctor before using it.

Avoid consuming alcohol and smoking simultaneously together, as it may affect the drug’s action and show an effect on the brain, leading to severe drowsiness, sedation, and coma in severe cases.

Avoid taking Telmisartan 80 mg + Chlorthalidone 12.5 mg with the following medicines, as it may increase or decrease the desired effect, or in worse cases, it could be fatal:

IUPAC (International Union of Pure and Applied Chemistry)/ Chemical name

Telmisartan- 2-[4-[[4-methyl-6-(1-methylbenzimidazol-2-yl)-2-propylbenzimidazol-1-yl]methyl]phenyl]benzoic acid

Chlorthalidone-2-ethoxy-3-[[4-[2-(5-oxo-4H-1,2,4-oxadiazol-3-yl)phenyl]phenyl]methyl]benzimidazole-4-carboxylic acid 

Daily dose

Take Telmisartan 80 mg + Chlorthalidone 12.5 mg exactly as your doctor recommends. The dose may change based on your condition and how well you respond. Do not take more than prescribed without consulting your doctor.

Missed Dose

If you forget to take your medicine, take the medication as soon as you remember. If it’s nearly time for your next dose, skip the missed one and continue with your regular schedule. Always consult the doctor before making any changes to your dosage.

Overdose

It is not recommended to take more than 200 mg of Telmisartan + chlorthalidone per day, as it may cause severe overdosing effects like extreme drowsiness, confusion, unconsciousness, sweating, double vision, low blood pressure, and slurred speech. Immediately seek medical attention and meet the doctor if necessary. 

1. Store the medicine at room temperature. 
2. Keep away from sunlight and moisture. 
3. Keep out of reach of children 

1. Take Telmisartan 80 mg + Chlorthalidone 12.5 mg exactly as prescribed by your doctor, at the same time each day. 
2. Do not stop taking Telmisartan 80 mg + Chlorthalidone 12.5 mg without your doctor’s approval, even if you feel better. 
3. If you forget to take Telmisartan 80 mg + Chlorthalidone 12.5 mg, take them as soon as you remember. If it’s almost time for your next dose, skip the missed dose.

What are the uses of Telmisartan 80 mg + Chlorthalidone 12.5 mg tablets?

Telmisartan 80 mg + Chlorthalidone 12.5 mg tablets are mainly used to treat high blood pressure and reduce fluid buildup (edema) caused by heart failure, kidney disease, or liver problems. They may also be used off‑label for conditions like kidney stones or resistant hypertension under medical supervision.

What are the side effects of Telmisartan 80 mg + Chlorthalidone 12.5 mg tablets?

Telmisartan 80 mg + Chlorthalidone 12.5 mg tablets can cause frequent urination, dizziness, headache, fatigue, nausea, constipation, low potassium, sun sensitivity, gout, and raised blood sugar. Less common effects include rash, muscle cramps, weakness, impotence, insomnia, and liver or pancreas problems, all of which need medical attention if severe.

What is the Telmisartan 80 mg + Chlorthalidone 12.5 mg drug class?

Telmisartan 80 mg + Chlorthalidone 12.5 mg belongs to the drug class of angiotensin receptor blockers and thiazide diuretics and can show vascular effects.

What is Telmisartan 80 mg + Chlorthalidone 12.5 mg highest dose?

The maximum recommended dose of Telmisartan 80 mg + Chlorthalidone 12.5 mg is 100 mg once daily, though most patients respond well at lower doses. Higher doses increase the risk of side effects like dehydration and electrolyte imbalance without adding much extra benefit.

1. StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2025 Jan–.chlorthalidone 12.5 mg. Available from. 
2. Cerner Multum. chlorthalidone 12.5 mg: Uses, Side Effects & Warnings [Internet]. Drugs.com; 2025 Oct 7 [cited 2025 Dec 22]. Available from. 
3. Mayo Clinic Staff. chlorthalidone 12.5 mg (oral route) [Internet]. Rochester (MN): Mayo Foundation for Medical Education and Research; 2025 Oct 1 [cited 2025 Dec 22]. Available from. 
4. National Center for Biotechnology Information. PubChem Compound Summary for CID 2715, chlorthalidone 12.5 mg [Internet]. Bethesda (MD): National Library of Medicine; [cited 2025 Dec 22]. Available from. 
5. PubChem [Internet]. Bethesda (MD): National Library of Medicine (US), National Center for Biotechnology Information; 2004–. PubChem Compound Summary for CID 135415867, Telmisartan [cited 2026 Apr 15]. Available from. 
6. Mayo Clinic [Internet]. Telmisartan (oral route). Rochester (MN): Mayo Foundation for Medical Education and Research; c2026 [cited 2026 Apr 15]. Available from. 
7. Drugs.com [Internet]. Telmisartan medoxomil. [cited 2026 Apr 15]. Available from.