Furobe 40 Mg Tablets
Clinical Summary
Quick overview from the medicine insert
Indication
Fluid retention and hypertension.
Dosage (summary)
Adults: 40 mg/day, may increase to 200 mg/day. Maintenance: 20-40 mg/day.
Special Populations
- Renal impairment
- Hepatic impairment
- Elderly
Pregnancy & Breastfeeding
Contraindicated in pregnancy and breastfeeding.
Key Drug Interactions
- Aminoglycosides
- Lithium
- NSAIDs
- ACE inhibitors
Contraindications
- Hypersensitivity to furosemide
- Hypovolaemia
- Anuric renal failure
- Severe hypokalaemia
- Severe hyponatraemia
Common side effects
- Electrolyte disturbances
- Hypotension
- Nausea
- Dizziness
Counselling Points
- Take on an empty stomach
- Avoid dehydration
- Monitor blood pressure regularly
Serious warnings
- Monitor for electrolyte imbalances
- Risk of dehydration
- Caution in diabetes
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Clinical Particulars
Section 4 of the official insert — extracted exactly as issued, no alterations
4.1. Therapeutic indications
u2022 Fluid retention associated with congestive cardiac failure.
u2022 Fluid retention associated with chronic renal failure.
u2022 Maintenance of fluid excretion in acute renal failure.
u2022 Fluid retention associated with nephritic syndrome (if diuretic treatment is required).
u2022 Fluid retention or ascites associated with liver disease.
u2022 Hypertension.
u2022 Hypertensive crisis (as a supportive measure).
u2022 Support of forced diuresis.
u2022 As an adjunct in acute pulmonary oedema.
u2022 Support measures in cerebral oedema.
4.2 Posology and method of administration
Adults: A dose of 40 mg per day is usually sufficient, but this may be increased to 200 mg per day if necessary. In the event that a dosage of 120 mg per day is exceeded, the treatment should provide for 2 or 3 separate doses. Maintenance therapy varies from 20 mg to 40 mg per day. For the treatment of hypertension of mild or moderate degree, a daily dosage of 40 mg to 80 mg orally. In combination with other hypotensive medicines, lower doses will often suffice.
Children: Children's dosages are usually in the order of 1 mg per kg body weight, which can be increased to 3 mg per kg bodyweight, if necessary, but a daily dosage of 120 mg should not be exceeded.
Method of administration: Oral formulations: It is recommended that FUROBE 40 mg TABLET be taken on an empty stomach. Tablets are to be swallowed whole without chewing and with sufficient amounts of liquid.
4.3 Contraindications
FUROBE 40 mg TABLET is contraindicated:
- in patients with hypersensitivity to furosemide or any of the excipients of FUROBE 40 mg TABLET (see section 6.1). Patients allergic to sulfonamides may show cross-sensitivity to furosemide,
- in patients with hypovolaemia or dehydration,
- in patients with anuric renal failure,
- in patients with severe hypokalaemia,
- in patients with severe hyponatraemia,
- in patients with pre-comatose and comatose states associated with hepatic encephalopathy,
- in breastfeeding women,
- if increasing uraemia and oliguria occur during treatment of severe progressive renal disease.
4.4 Special warnings and precautions for use
Urinary outflow must be secured. In patients with a partial obstruction of urinary outflow, increased production of urine may provoke or aggravate complaints. Thus, these patients require careful monitoring. Treatment with FUROBE 40 mg TABLET necessitates regular medical supervision.
Particularly careful monitoring is necessary:
- in patients with hypotension,
- in patients who would be at particular risk from a pronounced fall in blood pressure,
- in patients with latent or manifest diabetes mellitus,
- in patients with gout,
- in patients with hepatorenal syndrome,
- in patients with hypoproteinaemia (cautious dose titration is required),
- in premature infants (renal function must be monitored and renal ultrasonography performed).
Regular monitoring of serum sodium, potassium and creatinine is recommended during furosemide therapy; particularly close monitoring is required in patients at high risk of developing electrolyte imbalances or in case of significant additional fluid loss due to vomiting, diarrhoea or intense sweating. Hypovolaemia or dehydration as well as any significant electrolyte and acid-base disturbances must be corrected.
Concomitant use with risperidone: In risperidone placebo-controlled trials in elderly patients with dementia, a higher incidence of mortality was observed in patients treated with furosemide plus risperidone when compared to patients treated with risperidone alone. Caution should be exercised and the risks and benefits of this combination or co-treatment should be considered prior to the decision to use. Dehydration should be avoided.
The possibility exists of exacerbation or activation of systemic lupus erythematosus.
4.5 Interaction with other medicines and other forms of interaction
u2022 FUROBE 40 mg TABLET may potentiate the ototoxicity of aminoglycosides and other ototoxic medicines. Since this may lead to irreversible damage these medicines must only be used with FUROBE 40 mg TABLET if there are compelling medical reasons.
u2022 There is a risk of ototoxic effects if cisplatin and furosemide are given concomitantly. In addition, nephrotoxicity of cisplatin may be enhanced by a high dose of FUROBE 40 mg TABLET. FUROBE 40 mg TABLET should be given in low doses and with positive fluid balance when used to achieve forced diuresis during cisplatin treatment.
u2022 Oral FUROBE 40 mg TABLET and sucralfate must not be taken within 2 hours of each other because sucralfate decreases the absorption of FUROBE 40 mg TABLET from the intestine and so reduces its effect.
u2022 FUROBE 40 mg TABLET decreases the excretion of lithium salts and may cause increased risk of lithium toxicity, including increased risk of cardiotoxic and neurotoxic effects of lithium. It is recommended that lithium levels are carefully monitored in patients receiving this combination.
u2022 Patients who are receiving diuretics, such as FUROBE 40 mg TABLET, may suffer severe hypotension and deterioration in renal function, including renal failure, especially when an angiotensin-converting enzyme inhibitor (ACE) or angiotensin II receptor antagonist is given for the first time or for the first time in an increased dose. Consideration must be given to interrupting the administration of FUROBE 40 mg TABLET temporarily or at least reducing the dose of FUROBE 40 mg TABLET for three days before starting treatment with, or increasing the dose of, an ACE inhibitor or angiotensin II receptor antagonist.
u2022 Risperidone: Caution should be exercised and the risks and benefits of the combination or co-treatment with FUROBE 40 mg TABLET should be considered prior to the decision to use (see section 4.4).
u2022 Concomitant administration of nonsteroidal anti-inflammatory drugs (NSAIDs) including aspirin (acetylsalicylic acid) may reduce the effect of FUROBE 40 mg TABLET. In patients with dehydration or hypovolaemia, NSAIDs may cause acute renal failure. Salicylate toxicity may be increased by FUROBE 40 mg TABLET.
u2022 Attenuation of the effect of FUROBE 40 mg TABLET may occur following concurrent administration of phenytoin.
u2022 Aliskiren reduces plasma concentration of furosemide given orally. In patients treated with both aliskiren and oral FUROBE 40 mg TABLET, it is recommended to monitor for reduced diuretic effect and adjust the dose accordingly.
u2022 Corticosteroids, carbenoxolone, liquorice in large amounts, and prolonged use of laxatives may increase the risk of developing hypokalaemia.
u2022 Some electrolyte disturbances (e.g. hypokalaemia, hypomagnesaemia) may increase the toxicity of certain other medicines (e.g. digoxin and medicines inducing QT interval prolongation syndrome).
u2022 If antihypertensive medicines, diuretics or other medicines with blood pressure-lowering potential are given concomitantly with FUROBE 40 mg TABLET, a more pronounced fall in blood pressure must be anticipated.
u2022 Probenecid, methotrexate and other medicines which, like FUROBE 40 mg TABLET, undergo significant renal tubular secretion may reduce the effect of FUROBE 40 mg TABLET.
u2022 The effects of antidiabetic medicines and blood pressure-increasing sympathomimetics may be reduced. The effects of curare-type muscle relaxants or of theophylline may be increased.
u2022 Impairment of renal function may develop in patients receiving concurrent treatment with FUROBE 40 mg TABLET and high doses of certain cephalosporins.
u2022 Concomitant use of ciclosporin and FUROBE 40 mg TABLET is associated with increased risk of gouty arthritis secondary to FUROBE 40 mg TABLET induced hyperuricaemia and ciclosporin impairment of renal urate excretion.
u2022 Patients who were at high risk for radiocontrast nephropathy treated with FUROBE 40 mg TABLET experienced a higher incidence of deterioration in renal function after receiving radiocontrast, compared to high-risk patients who received only intravenous hydration prior to receiving radiocontrast.
u2022 The harmful effects of nephrotoxic medicines on the kidney may be increased.
u2022 When digoxin is administered concurrently it should be remembered that potassium deficiency increases the sensitivity of the myocardium to digoxin.
u2022 Levothyroxine: FUROBE 40 mg TABLET may inhibit binding of thyroid hormones to carrier proteins and thereby lead to an initial transient increase in free thyroid hormones, followed by an overall decrease in total hormone levels. Thyroid levels should be monitored.
4.6 Fertility, pregnancy and lactation
Furosemide crosses the placental barrier.
Pregnancy FUROBE 40 mg TABLET must not be given during pregnancy. Treatment during pregnancy requires monitoring of foetal growth.
Breastfeeding Furosemide passes into breast milk and may inhibit lactation. Women must not breastfeed their infant while they are treated with FUROBE 40 mg TABLET.
4.7 Effects on ability to drive and use machines
The effects on ability to drive or use machines may be impaired, especially at the commencement of treatment or when changing over from other medicines or when alcohol is consumed during FUROBE 40 mg TABLET therapy.
4.8 Undesirable effects
System Organ Class Frequent Less frequent Frequency Unknown Blood and lymphatic system disorders Haemoconcentration thrombocytopenia, leukopenia, agranulocytosis, aplastic or haemolytic anaemia, eosinophilia blood coagulation disorders Immune system disorders severe anaphylactic or anaphylactoid reactions (e.g. shock) exacerbation or activation of systemic lupus erythematosus Metabolism and nutrition disorders symptomatic electrolyte disturbances, dehydration, hypovolaemia, blood creatinine increased, increase in cholesterol and triglyceride serum levels, increase in uric acid serum levels and attacks of gout. Hyponatraemia, hypochloraemia, hypokalaemia impaired glucose tolerance, dryness of mouth, diabetes mellitus (latent becoming manifest; and aggravation of manifest) hypocalcaemia, hypomagnesaemia, increased blood urea, metabolic alkalosis, pseudo-Bartteru2019s syndrome Nervous System Disorders hepatic encephalopathy in patients with hepatocellular insufficiency paraesthesia dizziness, fainting or loss of consciousness, headache Ear and labyrinth disorder dizziness, fainting or loss of consciousness, headache Vascular disorders hypotension including orthostatic hypotension vasculitis tendency for thromboses, circulatory collapse, circulatory disorders (vertigo, feeling pressure in head, visual impairment), embolism Gastrointestinal disorders nausea, vomiting, diarrhoea, acute pancreatitis Hepato-biliary disorders intrahepatic cholestasis, increase in liver transaminases Skin and subcutaneous tissue disorders pruritus, urticaria, other rashes or bullous lesions; erythema multiforme, bullous pemphigoid, photosensitivity, purpura Stevens-Johnson syndrome, toxic epidermal necrolysis, exfoliative dermatitis, vesicular cutaneous eruptions, AGEP (acute generalised exanthematous pustulosis) and DRESS (drug rash with eosinophilia and systemic symptoms), lichenoid reactions Musculoskeletal, connective tissue and bone disorders tetany, cases of rhabdomyolysis often in the context of hypokalaemia Renal and Urinary disorders Musculoskeletal, connective tissue and bone disorders tubulointerstitial nephritis acute retention of urine in patients with a partial obstruction of urinary outflow, nephrocalcinosis/nephrolithiasis in premature infants, renal failure, increased urine sodium, increased urine chloride Congenital familial and genetic disorders increased risk of persistence of patent ductus arteriosus when furosemide is administered to premature infants during the first weeks of life General disorders and administration site conditions fever following intramuscular infection, local reactions such as pain Reporting of suspected adverse reactions Reporting suspected adverse reactions after authorisation of the medicine is important. It allows continued monitoring of the benefit/risk balance of the medicine. Health care providers are requested to report any suspected adverse drug reactions to SAHPRA via the Med Safety APP (Medsafety X SAHPRA) and eReporting platform (who-umc.org) found on SAHPRA website. Suspected adverse reactions can also be reported directly to the HCR via email: [email protected] or tel: +27(0) 12 643 2000.
4.9 Overdose
The clinical picture in acute or chronic overdose depends primarily on the extent and consequences of electrolyte and fluid loss, e.g. hypovolaemia, dehydration, haemoconcentration, cardiac dysrhythmias (including AV-block and ventricular fibrillation). Symptoms of these disturbances include severe hypotension (progressing to shock), acute renal failure, thrombosis, delirious states, flaccid paralysis, apathy and confusion.
No specific antidote to furosemide is known. If oral ingestion has taken place, attempts may be made to limit further systemic absorption of furosemide by measures such as those designed to reduce absorption (e.g. activated charcoal). Clinically relevant disturbances in electrolyte and fluid balance must be corrected. Together with the prevention and treatment of serious complications resulting from such disturbances and of other effects on the body, this may necessitate general and specific intensive medical monitoring and therapeutic measures.