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The product code(s) for this leaflet is: PL 11311/0714.
Losartan potassium
Losartan potassium 25 mg, 50 mg, 100 mg Film-Coated Tablets
1. What Losartan is and what it is used for
2. What you need to know before you take Losartan
3. How to take Losartan
4. Possible side effects
5. How to store Losartan
6. Contents of the pack and other information
Losartan belongs to a group of medicines known as angiotensin-II receptor antagonists. Angiotensin-II is a substance produced in the body which binds to receptors in blood vessels, causing them to tighten. This results in an increase in blood pressure. Losartan prevents the binding of angiotensin-II to these receptors, causing the blood vessels to relax which in turn lowers the blood pressure. Losartan slows the decrease of kidney function in patients with high blood pressure and type 2 diabetes.
Losartan is used:
Talk to your doctor or pharmacist before taking Losartan.
You must tell your doctor if you think you are (or might become) pregnant. Losartan is not recommended in early pregnancy, and must not be taken if you are more than 3 months pregnant, as it may cause serious harm to your baby if used at that stage (see “Pregnancy” section).
Talk to your doctor if you experience abdominal pain, nausea, vomiting or diarrhoea after taking Losartan. Your doctor will decide on further treatment. Do not stop taking Losartan on your own.
It is important to tell your doctor before taking Losartan:
Your doctor may check your kidney function, blood pressure, and the amount of electrolytes (e.g. potassium) in your blood at regular intervals.
See also information under the heading “Do not take Losartan”.
Losartan has been studied in children. For more information, talk to your doctor.
Losartan is not recommended for use in children suffering from kidney or liver problems, as limited data are available in these patient groups.
Losartan is not recommended for use in children under 6 years old, as it has not been shown to work in this age group.
Tell your doctor or pharmacist if you are taking, have recently taken or might take any other medicines, including those obtained without a prescription. This includes herbal medicines.
Tell your doctor if you are taking potassium supplements, potassium-containing salt substitutes, potassium-sparing medicines such as certain diuretics (amiloride, triamteren, spironolactone), or other medicines that may increase serum potassium (e.g., heparin, trimethoprim-containing medicines), as the combination with Losartan is not advisable.
Take particular care if you are taking the following medicines while under treatment with Losartan:
Your doctor may need to change your dose and/or to take other precautions:
If you are taking an ACE-inhibitor or aliskiren (see also information under the headings “Do not take Losartan” and “Warnings and precautions”).
If your kidney function is impaired, the concomitant use of these medicines may lead to a worsening of the kidney function.
Lithium-containing medicines should not be taken in combination with losartan without close supervision by your doctor. Special precautionary measures (e.g. blood tests) may be appropriate.
Losartan may be taken with or without food.
Grapefruit juice should be avoided while taking Losartan.
If you are pregnant or breast-feeding, think you may be pregnant or are planning to have a baby, ask your doctor for advice before taking this medicine.
Pregnancy
You must tell your doctor if you think you are (or might become) pregnant. Your doctor will normally advise you to stop taking Losartan before you become pregnant or as soon as you know you are pregnant and will advise you to take another medicine instead of Losartan. Losartan is not recommended in early pregnancy, and must not be taken when more than 3 months pregnant, as it may cause serious harm to your baby if used after the third month of pregnancy.
Breast feeding
Tell your doctor if you are breast-feeding or about to start breast-feeding. Losartan is not recommended for mothers who are breast-feeding, and your doctor may choose another treatment for you if you wish to breast-feed, especially if your baby is a newborn, or born prematurely.
No studies on the effects on the ability to drive and use machines have been performed.
Losartan is unlikely to affect your ability to drive or use machines. However, as with many other medicines used to treat high blood pressure, losartan may cause dizziness or drowsiness in some people. If you experience dizziness or drowsiness, you should consult your doctor before attempting such activities.
If you have been told by your doctor that you have an intolerance to some sugars, contact your doctor before taking this medicine.
This medicine contains less than 1 mmol sodium (23 mg) per dose, that is to say essentially ‘sodium-free’.
Always take this medicine exactly as your doctor has told you. Check with your doctor or pharmacist if you are not sure. Your doctor will decide on the appropriate dose of Losartan, depending on your condition and whether you are taking other medicines. It is important to continue taking Losartan tablets for as long as your doctor prescribes it in order to maintain smooth control of your blood pressure.
Adult patients with high blood pressure
Treatment usually starts with 50 mg losartan (two Losartan 25 mg tablets or one Losartan 50 mg tablet) once a day. The maximal blood pressure lowering effect should be reached 3-6 weeks after beginning treatment. In some patients the dose may later be increased to 100 mg losartan (two Losartan 50 mg tablets or one Losartan 100 mg tablet) once daily.
If you have the impression that the effect of losartan is too strong or too weak, please talk to your doctor or pharmacist.
Children below 6 years of age
Losartan is not recommended for use in children under 6 years old, as it has not been shown to work in this age group.
Children aged 6 - 18 years old
The recommended starting dose in patients who weigh between 20 and 50 kg is 0.7 mg of losartan per kg of body weight administered once a day (up to 25 mg of losartan). The doctor may increase the dose if blood pressure is not controlled.
Other form(s) of this medicine may be more suitable for children; ask your doctor or pharmacist.
Adult patients with high blood pressure and Type 2 diabetes
Treatment usually starts with 50 mg losartan (two Losartan 25 mg tablets or one Losartan 50 mg tablet) once a day. The dose may later be increased to 100 mg losartan (two Losartan 50 mg tablets or one Losartan 100 mg tablet) once daily depending on your blood pressure response.
Losartan may be administered with other blood pressure lowering medicines (e.g. diuretics, calcium channel blockers, alpha- or beta-blockers, and centrally acting agents) as well as with insulin and other commonly used medicines that decrease the level of glucose in the blood (e.g. sulfonylureas, glitazones and glucosidase inhibitors).
Adult patients with heart failure
Treatment usually starts with 12.5 mg losartan once a day. Generally, the dose should be increased weekly step-by-step (i.e., 12.5 mg daily during the first week, 25 mg daily during the second week, 50 mg daily during the third week, 100 mg daily during the fourth week, 150 mg daily during the fifth week) up to the maintenance dose as determined by your physician. A maximum dose of 150 mg losartan (for example, three tablets of Losartan 50 mg or one tablet each of Losartan 100 mg and Losartan 50 mg) once daily may be used.
In the treatment of heart failure, losartan is usually combined with a diuretic (medicine that increases the amount of water that you pass out through your kidneys) and/or digitalis (medicine that helps to make the heart stronger and more efficient) and/or a beta-blocker.
The doctor may advise a lower dose, especially when starting treatment in certain patients such as those treated with diuretics in high doses, in patients with liver impairment, or in patients over the age of 75 years. The use of losartan is not recommended in patients with severe hepatic impairment (see section “Do not take Losartan”).
The tablets should be swallowed whole with a glass of water. You should try to take your daily dose at about the same time each day. It is important that you continue to take Losartan until your doctor tells you otherwise.
If you accidentally take too many tablets, contact your doctor or nearest hospital emergency department immediately for advice. Remember to take this leaflet or any remaining tablets with you.
Symptoms of overdose include: low blood pressure, increased heartbeat, possibly decreased heartbeat.
Take it as soon as you remember, unless it is time for your next dose. If you miss a dose, do not take a double dose to make up for a forgotten dose.
Do not stop taking Losartan without talking to your doctor.
If you have any further questions on the use of this medicine, ask your doctor or pharmacist.
Like all medicines, Losartan can cause side effects, although not everybody gets them.
A severe allergic reaction (rash, itching, swelling of the face, lips, mouth or throat that may cause difficulty in swallowing or breathing).
Common (may affect up to 1 in 10 people)
Uncommon (may affect up to 1 in 100 people)
Rare (may affect up to 1 in 1,000 people)
Not known (frequency cannot be estimated from the available data)
Side effects in children are similar to those seen in adults.
If you get any side effects, talk to your doctor or pharmacist. This includes any possible side effects not listed in this leaflet. You can also report side effects directly via the Yellow Card Scheme at: www.mhra.gov.uk/yellowcard or search for MHRA Yellow Card in the Google Play or Apple App Store. By reporting side effects you can help provide more information on the safety of this medicine.
Each film-coated tablet contains 25 mg, 50 mg or 100 mg of losartan potassium
The other ingredients are : microcrystalline cellulose (E460), dibasic calcium phosphate, colloidal anhydrous silica, croscarmellose sodium, talc, magnesium stearate.
The film-coating contains hypromellose (E464), lactose monohydrate, titanium dioxide (E171), polyethylene glycol 4000 and sodium citrate dihydrate.
Losartan is available in:
Not all pack sizes may be marketed.
This leaflet was last revised in January 2025
Till-SKPL-V.2