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Furosemide is a white to off-white odorless crystalline powder. It is practically insoluble in water, sparingly soluble in alcohol, freely soluble in dilute alkali solutions and insoluble in dilute acids. Furosemide can be used to reduce excessive blood calcium levels which are inherently dangerous to the kidneys.

MP 220 °C (dec.)(lit.)
Density 1.606
FP 11 °C
storage temp.
Stability Stable, but light sensitive, air sensitive and hygroscopic. Incompatible with strong oxidizing agents.
Efficient diuretics Furosemide, is a class of efficient sulfonamide diuretics acting on the medullary loop of the ascending branch of the medulla,it has a strong and short-term diuretic effect,which can increase the excretion of water, sodium, chloride, potassium, calcium, magnesium, phosphate and so on. It Mainly inhibits Na + and Cl- reabsorption in medullary and cortex of the medullary loop ascending branch crude segment , it can promote the excretion of sodium, chloride and potassium and affect the formation of renal medullary high osmotic pressure,it can interfer the process of concentration and dilution of urine, and it can increase urine output. This product can inhibit the activity of prostaglandin decomposition enzyme ,make the content of prostaglandin E2 increase,it has effect on expansion of blood vessels, it also plays a role in the proximal tubule, glomerular filtration,it can increase renal blood flow,and adjust renal blood flow distribution,and reduce blood flow so that the cortex surface blood flow increases,it promotes diuresis, its effect is fast and strong, it is used for other diuretics invalid cases. Clinically it is used for the treatment of cardiac edema, renal edema, cirrhosis ascitic fluid, peripheral edema caused by dysfunction or vascular disorders , and it may contribute to an upper urinary tract stones excretion. Administration intravenously can treat brain edema, it also can accelerate the excretion of toxic substances in cerebral edema in poisoning . Note that when the diuretic furosemide is used, since the excretion of urine Cl-, Na +, K +, H + is increasing, while the excretion of HCO3- is not increasing, long-term repeated drug use or large quantities of drugs can cause low salt syndrome, low chlorine and low potassium alkalosis.
In recent years, researchers find that inhalation of furosemide can have a significant effect on asthma, it is like cromolyn sodium, which through inhibition of allergic mediator release, it can inhibit the release of the neurotransmitter acetylcholine and substance P, which may be related to inhibiting chloride ions into the cell membranes of respiratory tract. Clinically,it is used in exercise-induced asthma, immediate and delayed type antigen-induced asthma.
Chemical properties white or white alike crystalline powder. 206 °C melting point. Dissolved in acetone, methanol, dimethyl formamide, slightly soluble in ethanol, insoluble in water. Odorless, almost tasteless.
Toxicity grading Middle toxic
Acute toxicity Oral – rat LD50: 2600 mg/kg; Oral – Mouse LD50: 2200 mg/kg.
Flammability and hazard characteristics Combustible; fire decomposition produces toxic nitrogen oxides; sulfur oxides and chlorides smoke.
Storage Characteristics Ventilated, low-temperature ,dry storeroom.
Extinguishing agent Water, carbon dioxide, dry powder,sandy soil.
Air & Water Reactions Light sensitive. Air sensitive. Slightly soluble in water.
Reactivity Profile Furosemide may undergo hydrolysis at sufficiently low pH. The pH of aqueous solutions should be maintained in the basic range to prevent hydrolysis. Alcohol has been shown to improve the stability of Furosemide. Incompatible with strong oxidizing agents.
Fire Hazard Flash point data for Furosemide are not available; however, Furosemide is probably combustible.
Biological Activity Loop diuretic that inhibits the Na + /2Cl – /K + (NKCC) cotransporter. Also acts as a non-competitive antagonist at GABA A receptors with ~ 100-fold greater selectivity for α 6-containing receptors than α 1-containing receptors.
Application The diuretic effect of this product is a strong and short,it is a potent diuretic for the treatment of edema caused by heart, liver, kidney and other diseases, in particular, the base cases which other diuretics are invalid to;it can be used to treat acute pulmonary edema, brain edema , acute renal failure and high blood pressure and other diseases; in combination with fluid infusion, the product can promote poison excretion. Rat oral LD50 is 2600-2820mg/kg.
Usage Furosemide inhibits ion co-transport in the kidney. Furosemide is used as a diuretic. This compound belongs to the aminobenzenesulfonamides. These are organic compounds containing a benzenesulfonamide moiety with an amine group attached to the benzene ring.

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