Siofor 1000, 60 pcs

Pharmacodynamics

Hypoglycemic drug of the biguanide group. It provides reduction of both basal and postprandial blood glucose concentrations. It does not stimulate insulin secretion and therefore does not lead to hypoglycemia. The action of metformin is probably based on the following mechanisms:

• reduction of glucose production in the liver due to inhibition of gluconeogenesis and glycogenolysis;
• increased muscle sensitivity to insulin and therefore improved peripheral glucose uptake and utilization;
• inhibition of glucose absorption in the intestine.

Metformin through its action on glycogen synthetase stimulates intracellular glycogen synthesis. Increases the transport capacity of all hitherto known membrane glucose transport proteins.

Independently of the effect on blood glucose levels, it has a favorable effect on lipid metabolism and leads to a decrease in total cholesterol, low-density cholesterol and triglycerides.

Pharmacokinetics

absorption

. After oral administration, Cmax in plasma is reached after approximately 2.5 h and does not exceed 4 mcg/mL at maximum dosage. With food, absorption decreases and slows down slightly. Absolute bioavailability in healthy patients is approximately 50-60%.

Distribution

Virtually no binding to plasma proteins. The average Vd is 63-276 liters. It accumulates in salivary glands, muscles, liver and kidneys. It penetrates the erythrocytes.

Elimation

Extracted by the kidneys unchanged. Renal clearance is >400 ml/min. T1/2 is about 6.5 h.

Pharmacokinetics in special clinical cases

In decreased renal function, metformin clearance decreases in proportion to creatinine clearance. Thus, the T1/2 is prolonged and the plasma concentration of metformin is increased.

Indications

Type 2 diabetes mellitus, especially in overweight patients with ineffectiveness of diet therapy and physical activity.

Possible to use as monotherapy or in combination with other oral hypoglycemic drugs and insulin.

Active ingredient

Metformin

Composition

Active substances:

metformin hydrochloride 1000 mg.

Auxiliary substances:

hypromellose – 35.2 mg,

povidone – 53 mg,

magnesium stearate – 5.8 mg.

Composition of the shell:

Hypromellose – 11.5 mg,

Macrogol 6000 – 2.3 mg,

Titanium dioxide (E171) – 9.2 mg.

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How to take, the dosage

The drug should be taken orally with or after meals. The dose and regimen of the drug, as well as the duration of treatment are determined by the attending physician depending on the blood glucose level.

Adults

Monotherapy

The recommended starting dose is 500 mg (1 tablet). Síofor® 500 or 1/2 tablet of Síofor® 1000) 1 to 2 times daily or 850 mg (1 tablet of Siophor® 850) 1 time daily.

After 10-15 days after initiation of the drug, further gradual increase of the dose depending on the blood glucose level to an average daily dose: 3-4 tablets. of the drug Siofor® 500, 2-3 tablets of the drug Siofor® 850 or 2 tablets of the drug Siofor® 1000. Gradually increasing the dose reduces the number of unwanted effects from the gastrointestinal tract.

The maximum dose is 3000 mg/day in 3 doses (6 tablets of Siophor® 500 or 3 tablets of Siophor® 1000).

For patients who are prescribed high doses (2000-3000 mg/day), 2 tablets of Siophor® 500 may be replaced with 1 tablet of Siophor® 1000.

If a patient is switched to treatment with Siofor® from therapy with another antidiabetic drug, the latter should be stopped and the Siofor® should be started at the above doses.

Combined use with insulin

The drug Siophor® and insulin may be combined to improve glycemic control. The standard starting dose is 500 mg (1 tablet of Siofor® 500 or 1/2 tablet of Siofor® 1000) One to two times daily or 850 mg (1 tablet of Sophor® 850) once daily, with gradual dose increase at approximately one week intervals to an average daily dose of 3 – 4 tablets. Síofor® 500, 2 tablets of Síofor® 1000 or 2 to 3 tablets of Síofor® 850; the dose is controlled based on blood glucose concentration.

The maximum dose is 3000 mg/day in 3 doses.

Due to possible renal dysfunction in elderly patients, the dose of Siofor® is adjusted according to creatinine concentration in plasma. Regular renal function evaluation is necessary.

Children 10 to 18 years of age

Monotherapy and combined use with insulin

The standard starting dose is 500 mg (1 tablet. Síofor® 500 or 1/2 tablet of Síofor® 1000) Once daily or 850 mg (1 tablet of Siophor® 850) once daily.

10-15 days after initiation of the drug, further gradual increase of the dose is possible, depending on blood glucose levels. Gradual increase of the dose reduces the number of unwanted effects on the gastrointestinal tract.

The maximum dose for children is 2000 mg/day (4 tablets of Siophor® 500 or 2 tablets of Siophor® 1000) in 2-3 times.

The dose of insulin is determined on the basis of blood glucose levels.

Interaction

Contraindicated combinations

The intravascular administration of iodine-containing contrast agents in patients with diabetes may be complicated by renal failure, resulting in metformin cumulation and increased risk of lactacidosis. The use of Synophor® should be stopped 48 hours prior to X-ray examination with iodine-containing contrast agents provided that serum creatinine levels are normal.

Unrecommended combinations

The risk of lactacidosis increases with acute alcohol intoxication or concomitant use with ethanol-containing medications, especially with dietary or nutritional disorders and liver failure.

Combinations requiring caution

The concomitant use of metformin with danazol may lead to the development of hyperglycemic effects. If treatment with danazolol is necessary and after stopping its use, metformin dose adjustment is required under control of blood glucose concentrations.

In concomitant use with oral contraceptive drugs, epinephrine, glucagon, thyroid hormones, phenothiazine derivatives, nicotinic acid may increase blood glucose concentrations.

Nifedipine increases absorption, Cmax in plasma metformin, prolongs its excretion.

The cationic drugs (amiloride, morphine, procainamide, quinidine, ranitidine, triamterene, vancomycin) that are secreted in the tubules compete for tubular transport systems and with prolonged therapy may increase plasma Cmax of metformin.

Cimetidine slows drug excretion, which increases the risk of lactacidosis.

Metformin decreases Cmax and T1/2 of furosemide.

Metformin may decrease the effect of indirect anticoagulants.

Glucocorticoids (systemic and topical), beta-adrenomimetics and diuretics have hyperglycemic activity. Blood glucose concentration should be monitored more carefully, especially at the beginning of treatment. If necessary, the dose of metformin should be adjusted for the period of concomitant use and after withdrawal of these drugs.

ACE inhibitors and other antihypertensive drugs may decrease blood glucose. If necessary, the dose of metformin may be adjusted.

In concomitant use of Siofor® with sulfonylurea derivatives, insulin, acarbose, salicylates may increase the hypoglycemic effect.

Special Instructions

Lactacidosis is a serious pathological condition that is extremely rare and is associated with the accumulation of lactic acid in the blood, which can be caused by metformin cumulation. Described cases of lactacidosis in patients treated with metformin were observed primarily in patients with diabetes mellitus with severe renal insufficiency.

The prevention of lactacidosis involves the identification of all associated risk factors, such as decompensated diabetes, ketosis, prolonged fasting, excessive alcohol consumption, liver failure, and any condition associated with hypoxia. If lactacidosis is suspected, immediate withdrawal of the drug and emergency hospitalization is recommended.

Because metformin is excreted by the kidneys, plasma creatinine concentration should be determined before starting treatment, and then regularly thereafter. Particular caution should be exercised when there is a risk of impaired renal function, such as at the beginning of therapy with antihypertensive drugs, diuretics or NSAIDs.

The treatment with Sioform® should be temporarily changed to other hypoglycemic agents (e.g., insulin) 48 hours before and 48 hours after radiologic exploration with intravenous iodine contrast agents.

The use of Siofor® should be stopped 48 hours before elective surgery under general anesthesia, with spinal or epidural anesthesia. The therapy should be continued after resumption of oral nutrition or not earlier than 48 h after surgical intervention on condition of confirmation of normal renal function.

Siophor® is not a substitute for diet and daily exercise – these therapies must be combined according to the physician’s recommendation. During treatment with Siophor® all patients should follow a dietary intake of carbohydrates evenly throughout the day. Patients with excessive body weight should follow a low-calorie diet.

The standard laboratory tests for diabetic patients should be performed regularly.

The diagnosis of type 2 diabetes must be confirmed before using Siophor® in children aged 10 to 18 years.

In one-year controlled clinical studies of the effect of metformin on growth and development as well as puberty in children, data on these parameters with longer duration of use are not available. In this regard, it is recommended to closely monitor the relevant parameters in children receiving metformin, especially in the prepubertal period (10-12 years).

Monotherapy with Siophor® does not cause hypoglycemia, but caution is recommended with concomitant use of the drug with insulin or sulfonylurea derivatives.

Impact on ability to drive vehicles and other mechanisms requiring high concentration

The use of Siophor® does not cause hypoglycemia, therefore it does not affect the ability to drive vehicles and operate machinery.

When concomitant use of Siophor® with other hypoglycemic drugs (sulfonylurea derivatives, insulin, repaglinide) hypoglycemic states may occur, therefore caution should be exercised while driving vehicles and performing other potentially dangerous activities that require concentration and quick psychomotor reactions.

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