LOSARTAN; HYDROCHLOROTHIAZIDE (loe SAR tan; hye droe klor oh THYE a zide) treats high blood pressure. It may also be used to prevent a stroke in people with heart disease and high blood pressure. It relaxes your blood vessels and helps your kidneys remove more fluid through the urine, which lowers blood pressure. This medication is a combination of an ARB and diuretic.
What should I tell my care team before I take this medication?
They need to know if you have any of these conditions:
If you are on a special diet, like a low-salt diet
Immune system problems, like lupus
An unusual or allergic reaction to losartan, hydrochlorothiazide, sulfa drugs, other medications, foods, dyes, or preservatives
Pregnant or trying to get pregnant
How should I use this medication?
Take this medication by mouth. Take it as directed on the prescription label at the same time every day. You can take it with or without food. If it upsets your stomach, take it with food. Keep taking it unless your care team tells you to stop.
Talk to your care team about the use of this drug in children. Special care may be needed.
What if I miss a dose?
If you miss a dose, take it as soon as you can. If it is almost time for your next dose, take only that dose. Do not take double or extra doses.
What may interact with this medication?
Do not take this medication with any of the following:
This medication may also interact with the following:
Barbiturates, like phenobarbital
Blood pressure medications
Diuretics, especially triamterene, spironolactone or amiloride
Medications for diabetes
Medications that relax the muscles for surgery
Narcotic medications for pain
NSAIDs, medications for pain and inflammation, like ibuprofen or naproxen
Potassium salts or potassium supplements
Some cholesterol-lowering medications like cholestyramine or colestipol
Steroid medications like prednisone or cortisone
What side effects may I notice from receiving this medication?
Side effects that you should report to your care team as soon as possible:
Allergic reactions—skin rash, itching, hives, swelling of the face, lips, tongue, or throat
Dehydration—increased thirst, dry mouth, feeling faint or lightheaded, headache, dark yellow or brown urine
Gout—severe pain, redness, warmth, or swelling in the joints, such as the big toe
Kidney injury—decrease in the amount of urine, swelling of the ankles, hands, or feet
Low blood pressure—dizziness, feeling faint or lightheaded, blurry vision
Low potassium level—muscle pain or cramps, unusual weakness, fatigue, fast or irregular heartbeat, constipation
Sudden eye pain or change in vision such as blurred vision, seeing halos around lights, vision loss
Side effects that usually do not require medical attention (report to your care team if they continue or are bothersome):
Change in sex drive or performance
Runny or stuffy nose
What should I watch for while using this medication?
Check your blood pressure regularly while you are taking this medication. Ask your care team what your blood pressure should be and when you should contact them. When you check your blood pressure, write down the measurements to show your care team. If you are taking this medication for a long time, you must visit your care team for regular checks on your progress. Make sure you schedule appointments on a regular basis.
You must not get dehydrated. Ask your care team how much fluid you need to drink a day. Check with them if you get an attack of severe diarrhea, nausea and vomiting, or if you sweat a lot. The loss of too much body fluid can make it dangerous for you to take this medication.
Women should inform their doctor if they wish to become pregnant or think they might be pregnant. There is a potential for serious side effects to an unborn child, particularly in the second or third trimester. Talk to your care team or pharmacist for more information.
You may get drowsy or dizzy. Do not drive, use machinery, or do anything that needs mental alertness until you know how this medication affects you. Do not stand or sit up quickly, especially if you are an older patient. This reduces the risk of dizzy or fainting spells. Alcohol can make you more drowsy and dizzy. Avoid alcoholic drinks.
This medication may increase blood sugar. Ask your care team if changes in diet or medications are needed if you have diabetes.
Talk to your care team about your risk of skin cancer. You may be more at risk for skin cancer if you take this medication.
This medication can make you more sensitive to the sun. Keep out of the sun. If you cannot avoid being in the sun, wear protective clothing and use sunscreen. Do not use sun lamps or tanning beds/booths.
Avoid salt substitutes unless you are told otherwise by your care team.
Do not treat yourself for coughs, colds, or pain while you are taking this medication without asking your care team for advice. Some ingredients may increase your blood pressure.
Where should I keep my medication?
Keep out of the reach of children and pets.
Store at room temperature between 15 and 30 degrees C (59 and 86 degrees F). Protect from light. Keep the container tightly closed. Throw away any unused medication after the expiration date.
K Health articles are all written and reviewed by MDs, PhDs, NPs, or PharmDs and are for informational purposes only. This information does not constitute and should not be relied on for professional medical advice. Always talk to your doctor about the risks and benefits of any treatment.
This information is educational only and should not be construed as specific instructions for individual patients nor as a substitute for medical advice, diagnosis or treatment. Talk to your health care provider or pharmacist about the information and instructions. K Health assumes no liability for any use or reliance on this information.