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Medication Guide — Losartan Potassium And Hydrochlorothiazide

Patient-friendly FDA guidance and safety information.

Last updated · May 12, 2026Source: DailyMed ↗
Boxed Warning

When pregnancy is detected, discontinue losartan potassium and hydrochlorothiazide tablets as soon as possible. Drugs that act directly on the renin-angiotensin system can cause injury and death to the developing fetus .

WARNING: FETAL TOXICITY

See full prescribing information for complete boxed warning.

When pregnancy is detected, discontinue losartan potassium and hydrochlorothiazide tablets as soon as possible. Drugs that act directly on the renin-angiotensin system can cause injury and death to the developing fetus. ( 5.1)

Poison Help

If you suspect an overdose or accidental ingestion, call Poison Control: 1-800-222-1222 (free, 24/7, U.S.). For life-threatening symptoms, call 911.

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FDA-approved patient labeling

Patient Information

Losartan Potassium and Hydrochlorothiazide Tablets, USP

(loe-SAR-tanpoe-TAS-see-um and hye-droe-klor-oh-THYE-ah-zide)

50 mg/12.5 mg, 100 mg/12.5 mg, 100 mg/25 mg

Rx only

Read the Patient Information that comes with losartan potassium and hydrochlorothiazide tablets before you start taking it and each time you get a refill. There may be new information. This leaflet does not take the place of talking with your doctor about your condition and treatment.

What is the most important information I should know about losartan potassium and hydrochlorothiazide tablets?

What are losartan potassium and hydrochlorothiazide tablets?

Losartan potassium and hydrochlorothiazide tablets contain 2 prescription medicines, an angiotensin receptor blocker (ARB) and a diuretic (water pill). It is used to:

Losartan potassium and hydrochlorothiazide tablets have not been studied in children less than 18 years old.

High Blood Pressure (hypertension).Blood pressure is the force in your blood vessels when your heart beats and when your heart rests. You have high blood pressure when the force is too much. The losartan ingredient in losartan potassium and hydrochlorothiazide tablets can help your blood vessels relax so your blood pressure is lower. The hydrochlorothiazide ingredient in losartan potassium and hydrochlorothiazide tablets works by making your kidneys pass more water and salt.

Left Ventricular Hypertrophy (LVH)is an enlargement of the walls of the left chamber of the heart (the heart’s main pumping chamber). LVH can happen from several things. High blood pressure is the most common cause of LVH.

Who should not take losartan potassium and hydrochlorothiazide tablets?

Do not take losartan potassium and hydrochlorothiazide tablets if you:

What should I tell my doctor before taking losartan potassium and hydrochlorothiazide tablets?

Tell your doctor about all your medical conditions including if you:

  • are pregnant or planning to become pregnant.See "What is the most important information I should know about losartan potassium and hydrochlorothiazide tablets?"
  • are breastfeeding or plan to breastfeed. Losartan potassium and Hydrochlorothiazide can pass into your milk and may harm your baby. You and your doctor should decide if you will take losartan potassium and hydrochlorothiazide tablets or breastfeed. You should not do both.
  • have been vomiting (throwing up), having diarrhea, sweating a lot, or not drinking enough fluids. These could cause you to have low blood pressure.
  • have liver problems
  • have kidney problems
  • have systemic lupus erythematosus (Lupus; SLE)
  • have diabetes
  • have gout
  • have any allergies
  • have had skin cancer or if you develop a new skin lesion during the treatment. Treatment with hydrochlorothiazide may increase the risk of some types of skin cancer (non-melanoma skin cancer). Discuss with your doctor how to protect your skin from sun exposure and how often you should undergo skin cancer screening.

Tell your doctor about all of the medicines you take, including prescription and non‑prescription medicines, vitamins, and herbal supplements.

Losartan potassium and hydrochlorothiazide tablets and certain other medicines may interact with each other. Especially tell your doctor if you are taking:

  • potassium supplements
  • salt substitutes containing potassium
  • other medicines that may increase serum potassium
  • water pills (diuretics)
  • lithium (a medicine used to treat a certain kind of depression)
  • medicines used to treat pain and arthritis, called non-steroidal anti-inflammatory drugs (NSAIDs), including COX-2 inhibitors
  • other medicines to reduce blood pressure.

Know the medicines you take. Keep a list of your medicines and show it to your doctor and pharmacist when you get a new medicine.

How should I take losartan potassium and hydrochlorothiazide tablets?

What are the possible side effects of losartan potassium and hydrochlorothiazide tablets?

Losartan potassium and hydrochlorothiazide tablets may cause the following side effects that may be serious:

  • Injury or death of unborn babies.See "What is the most important information I should know about losartan potassium and hydrochlorothiazide tablets?"
  • Allergic reaction.Symptoms of an allergic reaction are swelling of the face, lips, throat, or tongue and may include severe shortness of breath and/or difficulty breathing. Get emergency medical help right away and stop taking losartan potassium and hydrochlorothiazide tablets.
  • Low blood pressure (hypotension).Low blood pressure may cause you to feel faint or dizzy. Lie down if you feel faint or dizzy. Call your doctor right away.
  • If you have kidney problems, you may see a worsening in how well your kidneys work.Call your doctor if you get swelling in your feet, ankles, or hands, or unexplained weight gain.
  • A new or worsening condition called systemic lupus erythematosus (Lupus; SLE)
  • Eye problems.One of the medicines in losartan potassium and hydrochlorothiazide tablets can cause eye problems that, if left untreated, may lead to vision loss. Symptoms of eye problems can happen within hours to weeks of starting losartan potassium and hydrochlorothiazide tablets. Tell your doctor right away if you have:
    • decrease in vision
    • eye pain
  • Sensitivity of the skin to the sun and risk of skin cancer.

The most common side effects of losartan potassium and hydrochlorothiazide tablets in people with high blood pressure are:

  • "colds" (upper respiratory infection)
  • dizziness
  • stuffy nose
  • back pain

Tell your doctor if you get any side effect that bothers you or that won't go away. This is nota complete list of side effects. For a complete list, ask your doctor or pharmacist.

You may report side effects to Solco Healthcare US, LLC at 1-866-257-2597 or FDA at 1-800-FDA-1088.

How should I store losartan potassium and hydrochlorothiazide tablets?

General information about losartan potassium and hydrochlorothiazide tablets

Medicines are sometimes prescribed for conditions that are not mentioned in patient information leaflets. Do not use losartan potassium and hydrochlorothiazide tablets for a condition for which it was not prescribed. Do not give losartan potassium and hydrochlorothiazide tablets to other people, even if they have the same symptoms that you have. It may harm them.

This leaflet summarizes the most important information about losartan potassium and hydrochlorothiazide tablets. If you would like more information, talk with your doctor. You can ask your pharmacist or doctor for information that is written for health professionals.

What are the ingredients in losartan potassium and hydrochlorothiazide tablets?

Active ingredients:losartan potassium, hydrochlorothiazide

Inactive ingredients:

colloidal silicon dioxide, lactose monohydrate, macrogol/polyethylene glycol, magnesium stearate, microcrystalline cellulose, polyvinyl alcohol-part hydrolyzed, pregelatinized starch, talc and titanium dioxide. Losartan potassium and hydrochlorothiazide tablets USP, 50 mg/12.5 mg and 100 mg/25 mg also contain D&C yellow No. 10 aluminum lake and FD&C blue No. 1/brilliant blue FCF aluminum lake. Losartan potassium and hydrochlorothiazide tablets USP, 100 mg/12.5 mg also contain lecithin.

Repackaged By / Distributed By: RemedyRepack Inc.

625 Kolter Drive, Indiana, PA 15701

(724) 465-8762

Sources

RxCUI: 979468

NDC: 70518-3404

Last fetched: May 12, 2026

Source: DailyMed ↗

⚠️ Disclaimer

This information is for educational purposes only and is not medical advice. Always consult your doctor, pharmacist, or other licensed healthcare professional before starting, stopping, or changing any medicine. Read full medical disclaimer.