Principal active substance: furosemide, which may be referenced as frusemide in some sources.
Common tablet strengths available in the United Kingdom include 40 mg and 100 mg; injectable forms and other strengths are also supplied for clinical use.
Conditions for which furosemide is commonly prescribed include fluid retention from heart failure, liver cirrhosis, kidney disorders such as nephrotic syndrome, and certain cases of high blood pressure.
Directly access the section on dosing steps and directions for practical information on taking this medicine.
Standard applications and how the drug works
Furosemide is a loop diuretic, often called a water tablet. It increases kidney excretion of salt and water, reducing excess fluid in tissues and lowering blood volume. This helps relieve swelling and can lower blood pressure.
- Reducing oedema associated with congestive heart failure
- Management of fluid accumulation in chronic liver disease
- Treating oedema caused by renal conditions such as nephrotic syndrome
- Adjunct treatment for hypertension when other agents are insufficient
For guidance on dose timing and changes, see dose administration guidance and practical tips.
Dosing data and practical directions
Only use furosemide exactly as prescribed. The prescriber will adjust the amount and timing to balance benefit and follow-on effects.
General practical points:
- Follow the prescription label and any written instructions from your clinician or pharmacist.
- Measure liquid doses with an appropriate dosing device supplied with the medicine, not a kitchen spoon.
- Because it increases urine output, many patients take their main dose in the morning. If prescribed twice daily, the second dose is often taken in the early afternoon to reduce night-time waking to urinate.
- Do not change or stop treatment without consulting your prescriber. If dose changes are needed they should be supervised clinically.
If you are uncertain about your regimen, contact a pharmacist or prescriber. For missed medication dose information see how to handle a dose you missed.
Safeguards with continuous tracking and monitoring of performance
Before and during treatment your clinician may advise blood tests and specific lifestyle directional guidance.
- Hydration and electrolytes: avoid dehydration; follow any guidance about fluid and salt intake. Your potassium and sodium levels may be monitored.
- Blood pressure and kidney checks: renal function and blood pressure are often reviewed after starting or changing dose.
- Sensitivity to sunlight: furosemide can increase sun sensitivity. Use sunscreen and protective clothing and avoid tanning beds.
- Vertigo sensation and low blood pressure: rise slowly from sitting or lying positions to reduce fainting risk, particularly after dose changes.
- Prenatal period and breastfeeding: discuss suspected risks and benefits with your prescriber if pregnant, planning pregnancy, or breastfeeding.
Review conditions that rule out this therapy before the therapy session begins.
Contramarkers pointing to to use in these settings and when to contact your clinician
Tell your prescriber if you have any of the following, or a history of them:
- Severe kidney impairment or difficulty passing urine
- Liver disease or significant bile flow problems
- Gout or chronically high uric acid
- The condition called systemic lupus erythematosus
- Diabetes, also called diabetes mellitus mellitus, sometimes called sugar diabetes
- Sulfonamide medication allergy or a prior reaction to furosemide
If you become pregnant, think you might be, or start breastfeeding, contact your clinician to discuss whether to continue the medicine.
Possible adverse events and warning signs
Although many people tolerate furosemide well, some effects can be serious. Seek immediate help for signs of a severe allergic reaction such as hives, breathing difficulty, or facial swelling.
Potential serious reactions requiring urgent medical review include:
- Marked reduction in urine output or signs of dehydration such as very dry mouth and intense thirst
- Severe weakness, fainting, or feeling unusually drowsy or confused
- Quick, erratic, or pounding heartbeat
- New or worsening muscle pain, severe cramps, or profound weakness
- Hearing problems or persistent tinnitus
- Severe skin reactions such as widespread rash with blisters or peeling
- Possible liver dysfunction signs: persistent abdominal pain, jaundice, dark urine, or light stools
- Easy bruising or unexplained bleeding
More common, usually less severe secondary consequences may include dizziness, a dull headache, gastrointestinal upset, tingling sensations, or temporary visual blur. Reach out to a healthcare professional if your secondary consequences persist or worsen.
Drug the act of interaction effects with over the counter supplements
Tell your clinician and pharmacist about all prescription, over-the-counter medicines, and herbal or dietary supplements you use.
- Non-steroidal anti-inflammatory drugs (NSAIDs) can reduce the diuretic effect and may affect kidney function.
- Medicines that alter potassium levels, such as corticosteroids or other diuretics, increase the risk of electrolyte imbalance.
- Digoxin treatment toxicity risk is greater when potassium is low; monitor levels if these drugs are used together.
- Lithium levels can rise when combined with loop diuretics; system monitoring is required.
- Aminoglycoside antibiotics and other ototoxic agents may increase the risk of hearing damage when used with furosemide.
- Sucralfate may reduce absorption; allow at least two hours between doses.
- Some herbal products, for example licorice, can worsen potassium loss.
If you need more detail about a specific a reciprocal exchange, consult a pharmacist or prescriber before changing any medicines.
Remedies for a i skipped a dose today
If you are on a regular schedule and miss a dose, take it as soon as you remember unless it is nearly time for the next scheduled dose. Do not administer two doses at once to catch up. For as-needed use, follow the prescriber's instructions about when to take it.
What to do in case of an experiencing an overdose
If you suspect an intentional overdose seek urgent medical attention or call emergency services. Symptoms of intentional overdose can include ringing in the ears, extreme dizziness, fainting, confusion, weakness, and loss of appetite. If feasible, please bring the medicine packaging.
Handling guidance for on a computer, there are memory and storage, each with a different role. and use
- Keep tablets at room temperature, away from heat, moisture and direct sunlight.
- Keep all medications out of the reach and out of the sight of children.
- Liquid formulations can have a limited in-use life. Ask your pharmacist; typical guidance is to use within 60 to 90 days after opening, then discard any remaining liquid.
See dosing and dosage guidelines and real world directions for advice on measuring liquid doses correctly.
Therapeutic other possibilities and price a high level overview in the UK
Alternative diuretics and related medicines may be considered depending on diagnosis and patient factors. Typical additional a different routes include the items below.
- Bumetanide: a loop diuretic that is generally more potent milligram for milligram.
- Torsemide (torasemide): another loop diuretic that may have a longer duration in some patients.
- Thiazide diuretics such as hydrochlorothiazide or indapamide: often used for hypertension and mild oedema.
- Chlortalidone (chlorthalidone): a long-acting thiazide-like agent for blood pressure control.
- Potassium-sparing diuretics and aldosterone antagonists such as spironolactone or eplerenone: used in heart failure and resistant oedema, frequently combined with loop diuretics.
Approximate private prices in Great Britain (indicative, vary by supplier and pack size):
- Furosemide tablets with a forty milligram dose, pack of 28 to 30: roughly 1 to 5 GBP for generic brands.
- Furosemide 100 mg tablets, similar pack sizes: commonly 2 to 7 GBP.
- Bumetanide 1 mg tablets, 28 pack: often 2 to 8 GBP.
- Generic thiazide agents such as hydrochlorothiazide or indapamide: typically 1 to 6 GBP for a month supply.
- Spironolactone generics, 25 to 50 mg, 28 tablets: around 2 to 9 GBP.
NHS prescriptions in England are normally charged per item unless you are exempt; this was 9.90 GBP in 2024 as a reference point. Scotland, Wales and Northern Ireland generally offer free prescriptions. Discuss costs and options with your prescriber or pharmacist.
If considering online purchases, ensure the pharmacy is legitimate and requires a valid prescription. See information on legal and regulatory matters matters for guidance on safe supply.
The United Kingdom's regulatory information and legal details
- Official status in law: furosemide is a Prescription Only Medicine (POM) in the UK and should be supplied only against a valid prescription.
- Regulation: supply and sale are governed by the Human Medicines Regulations 2012 and regulated by the Medicines and Healthcare products Regulatory Agency (MHRA).
- Pharmacy registration: community pharmacies are regulated by the General Pharmaceutical Council (GPhC); legitimate online pharmacies will display GPhC details and require a prescription.
- Prescribers: a prescription must be issued by an authorised UK prescriber, such as a doctor or an independent prescribing pharmacist or nurse.
- Sporting rules: diuretics are prohibited by the World Anti-Doping Agency because they may be used as masking agents. Athletes should consult UK Anti-Doping and may need a Therapeutic Use Exemption (TUE).
- Use as directed: do not share your medicine. Using furosemide without medical supervision, for example for rapid weight loss, is unsafe and may be unlawful.
- Driving and machinery: if you experience dizziness or fainting do not drive or operate machinery and follow DVLA guidance where relevant.
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