Furosemide

Furosemide is a medication with the active ingredient called furosemide. It is also known by other names such as Lasix and Frusemide. Furosemide is used to reduce excess fluid in the body caused by conditions like heart failure, liver disease, and kidney disease. It helps the body get rid of extra salt and water by increasing urine production.

Furosemide Price Info

The range for Furosemide price is £0.27 to £0.61 per pills. Factors like pack dimensions and active ingredient potency (60 or 360 mg) play a role.

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Description

Therapeutic Class

Furosemide belongs to the class of drugs known as loop diuretics. This group of medications functions by inhibiting the reabsorption of sodium and chloride in the loop of Henle within the kidneys. Its primary use is for the management of fluid retention in patients with congestive heart failure, liver disease, or kidney disorders.

Dosage Formulations

Furosemide is available in various dosage forms including oral tablets, oral solution, and intravenous (IV) injection. The commonly available tablet strengths are 20 mg, 40 mg, and 80 mg, while the oral solution is usually provided as a 10 mg/ml concentration. The IV formulation is often found in concentrations of 10 mg/ml for direct administration.

Indications for Use

Furosemide is prescribed for the treatment of edema associated with congestive heart failure, liver cirrhosis, and renal dysfunction, including nephrotic syndrome. It is also indicated for the management of hypertension, either alone or in combination with other antihypertensive agents.

Mechanism of Action

The primary mechanism of action of Furosemide involves inhibition of the sodium-potassium-chloride co-transporter in the ascending limb of the loop of Henle. This intraluminal activity leads to increased excretion of sodium, chloride, and water, resulting in diuresis. Increased urine output consequently reduces fluid accumulation and lowers blood pressure.

Pharmacokinetics Overview

Furosemide is rapidly absorbed from the gastrointestinal tract with an onset of action typically within one hour when administered orally. The bioavailability ranges from 43% to 69%. The drug undergoes significant renal elimination, and its half-life in patients with normal renal function is approximately 2 hours. When given intravenously, the diuretic effect occurs within 5 minutes.

Administration Guidelines

For oral administration, Furosemide should be taken on an empty stomach to optimize absorption. The IV form should be administered as a slow injection over 1-2 minutes or as a continuous infusion, depending on the clinical need. Monitoring of electrolyte levels is essential during therapy, especially in patients with renal dysfunction or those on concomitant diuretic therapy.

Potential Drug Interactions

The concomitant use of Furosemide with aminoglycoside antibiotics may increase the risk of ototoxicity. NSAIDs can reduce the diuretic and antihypertensive effects of Furosemide due to sodium retention. When combined with other antihypertensives, there may be an additive effect on lowering blood pressure, requiring dosage adjustments. Co-administration with lithium may increase lithium toxicity due to decreased renal clearance.

Common Side Effects

Patients taking Furosemide may experience a range of side effects including dehydration, electrolyte imbalances such as hypokalemia and hyponatremia, dizziness, headache, and orthostatic hypotension. Gastrointestinal disturbances like nausea, vomiting, and abdominal pain are also reported.

Laboratory Monitoring

Regular monitoring of blood electrolytes, renal function tests, and complete blood counts is necessary for patients on Furosemide. Specific parameters include serum potassium, sodium, calcium, magnesium levels, blood urea nitrogen (BUN), serum creatinine, and glucose levels. Monitoring ensures timely identification of potential imbalances or toxicities.

Contraindications Information

Furosemide is contraindicated in patients with anuria, hypersensitivity to furosemide or sulfonamides, and those with severe electrolyte depletion. It should not be used in patients with hepatic coma or pre-comatose states. Caution is advised in patients with gout due to potential hyperuricemia.

Special Populations Considerations

In elderly patients, dose adjustments may be required due to increased susceptibility to dehydration and renal dysfunction. Pediatric use must be carefully monitored as dosing guidelines vary based on weight and severity of conditions. Pregnant women should use Furosemide only if the potential benefit justifies the potential risk to the fetus.

Patient Counseling Points

Patients should be advised to take Furosemide as prescribed, avoid alcohol, and rise slowly from sitting or lying positions to prevent dizziness. They should report any symptoms of electrolyte imbalance such as muscle cramps, weakness, or irregular heartbeat. Additionally, patients should be instructed to monitor their weight regularly and report significant changes to their healthcare provider.

Overdose Management

Manifestations of Furosemide overdose include severe dehydration, electrolyte abnormalities, hypotension, and renal failure. In cases of overdose, supportive measures should be initiated including monitoring of fluid and electrolyte balance, and administration of intravenous fluids and electrolytes as needed. Dialysis may not be effective in removing Furosemide due to its high plasma protein binding.

Storage Requirements

Furosemide tablets and oral solution should be stored at room temperature, away from moisture and light. The IV formulation should also be kept at controlled room temperature and administered promptly after opening. Proper storage is essential to maintain the medication’s efficacy and safety.
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