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Pharmacological Parameters Study on Loop Diuretic Drug - Furosemide
ISSN: 2577-0543

Journal of Formulation Science & Bioavailability
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Pharmacological Parameters Study on Loop Diuretic Drug - Furosemide

Ali Saad*
Faculty of medicine, Mansourah University, Egypt
*Corresponding Author: Ali Saad, Faculty of medicine, Mansourah University, Egypt, Tel: 00965-65520979, Email: [email protected]

Received Date: Dec 18, 2017 / Accepted Date: Jan 01, 2018 / Published Date: Jan 15, 2018



Furosemide is a loop diuretic that prevents our body to absorb more amount of Salt and helps to pass out from urine. Furosemide treats liquid maintenance i.e. edema, in individuals with Heart Failure, liver or a kidney issue, for example: Nephrotic disorder. Fersoamide is additionally used to treat hypertension also.

Furosemide, sold under the brand name Lasix among others, is a prescription used to treat liquid Formation because of heart Failure, liver scarring, or kidney illness. It might likewise be utilized for the treatment of high blood pressure. It can be taken through IV route or through Oral route. At the point when taken intravenously it starts working within five minutes while orally it normally starts working in an hour [1,2].

Loop diuretics is a Category of Diuretic drug which is Anthranilic acid Derivative and play an important role in maintaining the Na+/K+ balance of the body and meanwhile also helps in regulating the blood pressure of the body, Heart failure and kidney disease.

Loop diuretics, especially furosemide, are widely used in various conditions. The bioavailability of furosemide differs between oral and in intravenous therapy. The threshold and ceiling doses of furosemide differ according to the clinical condition. Furosemide also has several side effects, especially in Chronic Kidney patients and Hypertension patient too. To improve the efficacy of the Furosemide drug the Pharmacokinetics and Pharmacodynamics factors will be well known including with its side effect. If at particular dosages form the drug shows the Therapeutic affect than the dosages form will be reduced and if not than it will adjust until the appropriate Therapeutic effect will not come in an patient suffering from Chronic Kidney Disease [3].


Brand names for Furosemide: Diaqua-2; Disal; Lasix.

Structure is given in Figure 1.


Figure 1: Structure of furosemide.

IUPAC Name: 4-chloro-2-[(furan-2-ylmethyl)amino]-5- sulfamoylbenzoic acid.

Molecular Formulae: 330.774.

Chemical Formulae: C12H11ClN2O5S.

Mono-isotopic Mass: 330.007719869.

Melting point: 403°F.


-Slightly solubilize in CHCl3.

-Soluble in CH3 OH, Less soluble in ethanol.

-Slightly solubilized in PEG and insoluble in alcohol.

-Freely solubilized in alkali hydroxide.


-Discoloration will occur when exposed in light.

-Stored in Stable room temperature.

-Precipitation will take place on refrigeration.

-Stable in Basic media and unstable in Acidic media.

-When Heated it emits toxic fumes [4].

Mode of Action

Furosemide, a higher efficacy loop diuretic, hinders water reabsorption in the nephron by obstructing the sodium-potassiumchloride co-transporter (NKCC2) in the thick ascending limb of loop of Henley. This is accomplished through inhibition at the chloride restricting site on the co-transporter, subsequently keeping the secretion of sodium from the lumen of the loop of Henley into the basolateral interstitium. Because of this, the lumen turns out to be more hypertonic while the interstitium turns out to be less hypertonic, which thus diminishes the osmotic gradient for water reabsorption all through the nephron. Since the thick ascending loop is responsible for 25% of sodium reabsorption in the nephron, furosemide is an extremely intense and a higher efficacy diuretic. Figure 2 shows the Mode of action of Drug into the loop of Henley [5].


Figure 2: Diagrammatic representation of mechanism of action of loop diuretic drug Furosemide.


Absorption - 50–57% absorbed after oral route which is decreases in acute Heart failure and in kidney failure patients and also absorbed from Intra Muscular route of administration.

Half-life - Half an hour and Increase the renal impairment

Distribution - Placenta crossing.

Protein binding - 90-99.00%.

Metabolism and excretion - Metabolized in liver and excrete out in unchanged form in urine.

Time Profile and Action

Following Time profile action of furosemide drug is shown in the Table 1 with Duration of action followed by route of administration of drug.

Route of Administration Initial time Action Peak value Action of Duration
Oral Administration 45 to 60 min 2 h 5–7 h
Intra Muscular 05 to 20 min unknown 3–7 h
Intra Venous 2 min 20 min 1 h 45 min

Table 1: Time profile action of furosemide drug.

Furosemide Recommended Dosages form to different Patients

Paediatrics patient - The initial P.A dosages form for kids is 3 mg/ kg. Until the desired effect of the drug will not achieved, the initial dosages form might be expanded by 1-2 mg/kg in every half an hour [6].

Hypertension - For the treatment of Hypertension 20 mg dosages form will be prescribed twice a day.

Geriatric use - The dosages form for the elderly patient will depends according to the disease conditions. Usually starting with low dosages form i.e. 20 mg, will be prescribed for the treatment and there will be slow increment in the dosages form if the acquired therapeutic effect will not come in an particular dose.

Edema - The initial dose of furosemide is 20 to 40 mg given through parental route of administration i.e. iM or iV. The intravenous dose should be given slowly. If needed, another dose may be administered parentally in a time gap of 2 hours. The dosage might be raised by 10 mg and should not be administered before two hours after the previous dose administration time until the desired diuretic effect has been obtained. The dosages form will be prescribed twice a day. Individualization of the therapy based on the maximum therapeutic effect obtained at minimum dosages form to maintain the response. Following three Different dosages form i.e. 20 mg, 40 mg, 80 mg of furosemide is shown below in Figure 3.


Figure 3: Different dosages form of Fersoamide.

The initial P.A dose for treatment of edema in grown-ups is 20-80 mg as a solitary dosage. A similar dosages form or an expanded dosage might be administered after 7-8 h. Until the desired effect will not come the dosages form will increased from 20-40 mg in each 5-6 h [7].

Furosemide Disease Interaction


The patient with Liver disease like Cirrhosis is under Strict Observation, during loops diuretic therapy. The Change in Fluid and Electrolyte balance causes precipitation of liver Encephalopathy which later one may have the chances of Hypokalaemia. Potassiumsparing Diuretic agents may help in preventing the hypokalaemia and metabolic alkalosis. Furosemide drug is not given to the patient who is already suffering from Hypokalaemia until unless the condition will not good.


Loop Diuretics may cause increase in Blood sugar level and Excretion of Glucose in urine. Seldom, precipitation of diabetes mellitus has been accounted for. Loop diuretic Therapy should be administered circumspectly in the Hyperglycaemia or diabetes Mellitus patient.


Rate of urine Acidosis is diminishes by loop diuretics. Hyperuricemia may happen which might be leads to Gout other than the patient with past history Renal failure issues or Gout problem. Loop diuretic Therapy should be cautiously administered in the patient suffers from Chronic Renal failure disease.


The use of Loop diuretic in regular basis may cause Hearing loss and Tinnitus which are permanent and reversible effects. An ototoxic effect generally comes usually due to high dose of loop diuretic through IM and iV route of administration. Loop diuretic Therapy should be cautiously administered in the patient with post Ear or Vestibular impairment [8-10].

Adverse Effects

All side effects are categorized below:

1. Systemic hypersensitivity reactions

- Severe Anaphylactoid Reactions

- Interstitial Nephritis

2. Gastrointestinal system reactions

- Pancreatitis

- Jaundice

- Increased Liver Enzymes

- Anorexia

- Gastric irritation

- Diarrhoea

3. Cardiovascular reaction

- Increase in cholesterol and triglyceride serum levels

- Orthostatic hypotension may occur and be aggravated by alcohol, barbiturates or narcotics.

4. Central nervous system reactions

- Hearing problem

- Dizziness

- Headache

- Hematologic Reactions

- Agranulocytosis

- Haemolytic anaemia

- Leukopenia

5. Antibiotics which cause hearing loss when given with Fersoamide

- Neomycin

- Paromomycin

- Tobramycin

- Amikacin

- Cefuroxime

- Gentamicin

- Cephalexin

6. Other reactions

- Glycosuria

- Hyperuricemia

- Hyperglycaemia

- Urinary bladder spasm

- Muscle spasm

- Weakness

Depending on the Effects of Adverse Reaction to the body, Furosemide dosages should be adjusted or else therapy is withdrawn [11,12].


- In kidney disfunctioning

- Bladder Obstruction

- In liver disfunctioning like Cirrohosiss

- Helps in urination, if someone has issue regarding to the urination

- Gout

- Diabetes

- Hypertension

- Maintain the electrolyte balance

- Congestive Heart Failure

- Severe Hypercalcemia

- Acute pulmonary Edema.


Citation: Saad A (2018) Pharmacological Parameters Study on Loop Diuretic Drug - Furosemide. J Formul Sci Bioavailab 2: 117. DOI: 10.4172/2577-05431000117

Copyright: © 2018 Saad A. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.