Yes. A low-sodium diet can enhance the blood-pressure-lowering effect of Losartan and is often recommended as part of lifestyle management for hypertension.
Losartan lowers blood pressure throughout the day, so readings taken after the medication reaches steady state (usually after a few weeks) will reflect its effect.
Exercise is beneficial for blood-pressure control. Losartan does not impair physical activity, but patients should stay hydrated and monitor for dizziness, especially when first starting therapy.
Sudden lip swelling may signal angioedema, a medical emergency. Seek immediate medical attention or call emergency services.
Because Losartan can raise potassium levels, routine potassium supplements are generally discouraged unless a healthcare professional specifically advises them.
Yes, but keep the medication in its original packaging with the prescription label visible. Carry a copy of the prescription or a doctor’s note, especially for airport security checks.
A dry cough is less common with ARBs than with ACE inhibitors. If a cough does develop, it may be unrelated to Losartan, but you should discuss it with your prescriber.
Losartan is marketed under several brand names, such as Cozaar and Losartan Teva. All contain the same active ingredient and are considered therapeutically equivalent.
Blood-pressure reduction can be observed within 1-2 weeks, but the full antihypertensive effect may take up to 4 weeks as the body adjusts.
Do not flush them down the toilet. Return expired tablets to a pharmacy’s medicine-take-back service or follow local NHS disposal guidelines to protect the environment.
Losartan is a prescription-only medication used to treat conditions related to the heart and blood pressure. It belongs to the angiotensin II receptor blocker (ARB) class and is available as a pill in strengths of 25 mg, 50 mg, and 100 mg. In the United Kingdom, Losartan is regulated by the Medicines and Healthcare products Regulatory Agency (MHRA) and is supplied under various brand names, such as Cozaar.
Losartan selectively blocks the angiotensin II type 1 (AT₁) receptor. Angiotensin II normally binds to this receptor to cause blood vessels to narrow, stimulate aldosterone release, and increase sodium retention. By preventing this binding, Losartan:
The drug reaches peak plasma concentrations within 1-2 hours after oral intake and has an effective half-life of about 2 hours, but its active metabolite (exp3174) extends antihypertensive action for up to 24 hours.
These approvals are based on clinical trials demonstrating blood-pressure control and organ-protective benefits.
Research studies have examined Losartan’s ability to slow aortic-root enlargement in patients with Marfan syndrome. While some trials show modest benefit, the use remains off-label in the UK and should only be considered under specialist supervision.
Off-label use requires medical supervision and individualized risk assessment.
Absolute contraindications
Known hypersensitivity to Losartan or any ARB component.
Pregnancy (second and third trimester) - the drug can cause fetal kidney injury and skull ossification defects.
Lactation - Losartan is excreted in breast milk; alternatives are preferred.
Relative contraindications
Severe hepatic impairment - dose reduction may be needed.
Significant renal artery stenosis - risk of worsening renal function.
History of angioedema associated with ACE inhibitors or ARBs.
Special populations
Elderly patients - start with a lower dose (25 mg) to reduce the chance of hypotension.
Children - Losartan is not recommended for use in patients under 6 years of age; pediatric dosing is limited to specific conditions and should be guided by a paediatric cardiologist or nephrologist.
These effects are usually mild and transient; staying hydrated and rising slowly from a seated position can help.
If any of these symptoms occur, discontinue the medication and obtain urgent medical attention.
Losartan is metabolised primarily by CYP2C9 and CYP3A4; strong inhibitors or inducers of these enzymes may alter its plasma concentration.
Patients should always inform their healthcare provider of all medicines, supplements, and herbal products they are taking.
Standard dosing:
Most adults start with 50 mg once daily.
The dose can be increased to 100 mg once daily if blood pressure remains uncontrolled.
In patients prone to low blood pressure or renal impairment, a 25 mg starting dose may be preferred.
Administration:
Swallow the pill whole with a glass of water.
It may be taken with or without food; consistency (same time each day) helps maintain stable blood levels.
Missed dose:
Take the missed tablet as soon as you remember, unless it is near the time of the next scheduled dose.
Do not double the dose to catch up.
Overdose:
Symptoms may include severe hypotension, dizziness, or fainting.
Seek emergency medical care; treatment is primarily supportive (e.g., intravenous fluids, blood-pressure monitoring).
Special populations:
Renal impairment - lower initial dose (25 mg) and monitor kidney function.
Hepatic impairment - dose reduction may be required; follow specialist advice.
Elderly - start low, titrate slowly.
Discontinuation:
Losartan does not require tapering, but stopping abruptly may cause a rebound rise in blood pressure.
Discuss any changes with a prescriber.
Regular review with a healthcare professional ensures that the medication remains safe and effective.
This article provides educational information about Losartan and is not a substitute for professional medical advice. Treatment decisions, including use for unapproved indications, must be made under the guidance of a qualified healthcare provider. The content is intended for informational purposes and does not constitute medical recommendations. Always consult a physician before starting, stopping, or changing any medication regimen.
