Suopinchon Injection is generally well tolerated.
Eosinophilia is rare.
Occasionally, thrombocytopenia may occur. In rare cases, leucopenia and, in isolated cases, agranulocytosis, aplastic anaemia or haemolytic anaemia may develop.
Bone marrow depression has been reported as a rare complication and necessitates withdrawal of treatment.
Rarely, paraesthesiae may occur.
Serum calcium levels may be reduced; in very rare cases, tetany has been observed. Nephrocalcinosis/Nephrolithiasis has been reported in premature infants.
Serum cholesterol and triglyceride levels may rise during furosemide treatment. During long-term therapy, they will usually return to normal within six months.
Glucose tolerance may decrease with furosemide. In patients with diabetes mellitus, this may lead to a deterioration of metabolic control; latent diabetes mellitus may become manifest.
Hearing disorders and tinnitus, although usually transitory, may occur in rare cases, particularly in patients with renal failure, hypoproteinaemia (e.g. in nephritic syndrome) and/or when intravenous furosemide has been given too rapidly.
Furosemide may cause a reduction in blood pressure, which, if pronounced, may cause signs and symptoms such as impairment of concentration and reactions, light-headedness, sensations of pressure in the head, headache, dizziness, drowsiness, weakness, disorders of vision, dry mouth, orthostatic intolerance.
In isolated cases, intrahepatic cholestasis, an increase in liver transaminases or acute pancreatitis may develop.
The incidence of allergic reactions, such as skin rashes, photosensitivity, vasculitis, fever, interstitial nephritis or shock is very low, but when these occur, treatment should be withdrawn. Skin and mucous membrane reactions may occasionally occur, e.g. itching, urticaria, other rashes or bullous lesions, erythema multiforme, exfoliative dermatitis, purpura.
As with other diuretics, electrolytes and water balance may be disturbed as a result of diuresis after prolonged therapy. Furosemide leads to increased excretion of sodium and chloride and consequently, water. In addition, excretion of other electrolytes (in particular potassium, calcium and magnesium) is increased. Symptomatic electrolyte disturbances and metabolic alkalosis may develop in the form of a gradually increasing electrolyte deficit or, e.g. where higher furosemide doses are administered to patients with normal renal function, acute severe electrolyte losses. Warning signs of electrolyte disturbances include increased thirst, headache, hypotension, confusion, muscle cramps, tetany, muscle weakness, disorders of cardiac rhythm and gastrointestinal symptoms. Pre-existing metabolic alkalosis (e.g. in decompensated cirrhosis of the liver) may be aggravated by furosemide treatment.
The diuretic action of furosemide may lead to or contribute to hypovolaemia and dehydration, especially in elderly patients. Severe fluid depletion may lead to haemoconcentration with a tendency for thromboses to develop.
Increased production of urine may provoke or aggravate complaints in patients with an obstruction of urinary outflow. Thus, acute retention of urine with possible secondary complications may occur, for example, in patients with bladder-emptying disorders, prostatic hyperplasia or narrowing of the urethra.
If furosemide is administered to premature infants during the first weeks of life, it may increase the risk of persistence of patent ductus arteriosus.
Severe anaphylactic or anaphylactoid reactions (e.g. with shock) occur rarely.
Side-effects of a minor nature such as nausea, malaise or gastric upset (vomiting or diarrhoea), may occur but are not usually severe enough to necessitate withdrawal of treatment.
Following intramuscular injection, local reactions such as pain may occur.
As with other diuretics, treatment with furosemide may lead to transitory increases in blood creatinine and urea levels. Serum levels of uric acid may increase and attacks of gout may occur.
Reduced mental alertness may impair the ability to drive or operate dangerous machinery.