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Uses
Metformin HCl tablets, USP are indicated as an adjunct to diet and exercise to improve glycemic control in adults and children with type 2 diabetes mellitus.
History
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Other Information
Metformin Hydrochloride (HCl) Tablets, USP is an oral antihyperglycemic drug used in the management of type 2 diabetes. Metformin HCl, USP ( N,N-dimethylimidodicarbonimidic diamide HCl) is not chemically or pharmacologically related to any other classes of oral antihyperglycemic agents. The structural formula is as shown:
Metformin HCl, USP is a white to off-white crystalline compound with a molecular formula of C4H11N5•HCl and a molecular weight of 165.62. Metformin HCl, USP is freely soluble in water and is practically insoluble in acetone, ether and chloroform. The pKa of metformin is 12.4. The pH of a 1% aqueous solution of metformin HCl, USP is 6.68.
Metformin HCl tablets, USP, contains 500 mg, 850 mg, and 1000 mg of metformin HCl, USP. Each tablet contains the inactive ingredients povidone, microcrystalline cellulose, croscarmellose sodium and magnesium stearate. In addition, the coating for 500 mg, 850 mg and 1000 mg contains: polyethylene gycol, polyvinyl alcohol, titanium dioxide and talc.
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Clarins Ever Matte Broad Spectrum Spf 15 Tint 110 Manufacturers
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Laboratoires Clarins S.a
Clarins Ever Matte Broad Spectrum Spf 15 Tint 110 | Mckesson Packaging Services A Business Unit Of Mckesson Corporation
There is no fixed dosage regimen for the management of hyperglycemia in patients with type 2 diabetes with metformin or any other pharmacologic agent. Dosage of metformin must be individualized on the basis of both effectiveness and tolerance, while not exceeding the maximum recommended daily dose. The maximum recommended daily dose of metformin HCl tablets, USP is 2550 mg in adults and 2000 mg in pediatric patients (10-16 years of age).
Metformin should be given in divided doses with meals and should be started at a low dose, with gradual dose escalation, both to reduce gastrointestinal side effects and to permit identification of the minimum dose required for adequate glycemic control of the patient.
During treatment initiation and dose titration (see Recommended Dosing Schedule), fasting plasma glucose should be used to determine the therapeutic response to metformin and identify the minimum effective dose for the patient. Thereafter, glycosylated hemoglobin should be measured at intervals of approximately three months. The therapeutic goal should be to decrease both fasting plasma glucose and glycosylated hemoglobin levels to normal or near normal by using the lowest effective dose of metformin HCl tablets, USP either when used as monotherapy or in combination with sulfonylureas or insulin.
Monitoring of blood glucose and glycosylated hemoglobin will also permit detection of primary failure, i.e., inadequate lowering of blood glucose at the maximum recommended dose of medication, and secondary failure, i.e., loss of an adequate blood glucose lowering response after an initial period of effectiveness.
Short-term administration of metformin may be sufficient during periods of transient loss of control in patients usually well-controlled on diet alone.
Recommended Dosing Schedule AdultsIn general, clinically significant responses are not seen at doses below 1500 mg per day. However, a lower recommended starting dose and gradually increased dosage is advised to minimize gastrointestinal symptoms.
The usual starting dose of metformin HCl tablets, USP is 500 mg twice a day or 850 mg once a day, given with meals. Dosage increases should be made in increments of 500 mg weekly or 850 mg every 2 weeks, up to a total of 2000 mg per day, given in divided doses. Patients can also be titrated from 500 mg twice a day to 850 mg twice a day after 2 weeks. For those patients requiring additional glycemic control, metformin may be given to a maximum daily dose of 2550 mg per day. Doses above 2000 mg may be better tolerated given three times a day with meals.
If higher doses of metformin are required, Metformin HCl, USP should be used at total daily doses up to 2550 mg administered in divided daily doses, as described above. (See CLINICAL PHARMACOLOGY, Clinical Studies.)
PediatricsThe usual starting dose of metformin HCl tablets, USP is 500 mg twice a day, given with meals. Dosage increases should be made in increments of 500 mg weekly up to a maximum of 2000 mg per day, given in divided doses.
Transfer from Other Antidiabetic TherapyWhen transferring patients from standard oral hypoglycemic agents other than chlorpropamide to metformin, no transition period generally is necessary. When transferring patients from chlorpropamide, care should be exercised during the first two weeks because of the prolonged retention of chlorpropamide in the body, leading to overlapping drug effects and possible hypoglycemia.
Concomitant Metformin HCl, USP and Oral Sulfonylurea Therapy in Adult PatientsIf patients have not responded to four weeks of the maximum dose of metformin HCl tablets, USP monotherapy, consideration should be given to gradual addition of an oral sulfonylurea while continuing metformin HCl tablets, USP at the maximum dose, even if prior primary or secondary failure to a sulfonylurea has occurred. Clinical and pharmacokinetic drug-drug interaction data are currently available only for metformin plus glyburide (glibenclamide).
With concomitant metformin HCl, USP and sulfonylurea therapy, the desired control of blood glucose may be obtained by adjusting the dose of each drug. In a clinical trial of patients with type 2 diabetes and prior failure on glyburide, patients started on metformin 500 mg and glyburide 20 mg were titrated to 1000/20 mg, 1500/20 mg, 2000/20 mg or 2500/20 mg of metformin and glyburide, respectively, to reach the goal of glycemic control as measured by FPG, HbA1c and plasma glucose response (see CLINICAL PHARMACOLOGY: Clinical Studies). However, attempts should be made to identify the minimum effective dose of each drug to achieve this goal. With concomitant metformin HCl tablets, USP and sulfonylurea therapy, the risk of hypoglycemia associated with sulfonylurea therapy continues and may be increased. Appropriate precautions should be taken. (See Package Insert of the respective sulfonylurea.)
If patients have not satisfactorily responded to one to three months of concomitant therapy with the maximum dose of metformin and the maximum dose of an oral sulfonylurea, consider therapeutic alternatives including switching to insulin with or without metformin HCl tablets, USP.
Concomitant Metformin HCl Tablets, USP and Insulin Therapy in Adult PatientsThe current insulin dose should be continued upon initiation of metformin HCl tablets, USP therapy. Metformin HCl tablets, USP therapy should be initiated at 500 mg once daily in patients on insulin therapy. For patients not responding adequately, the dose of metformin HCl tablets, USP should be increased by 500 mg after approximately 1 week and by 500 mg every week thereafter until adequate glycemic control is achieved. The maximum recommended daily dose is 2500 mg for metformin HCl tablets, USP. It is recommended that the insulin dose be decreased by 10% to 25% when fasting plasma glucose concentrations decrease to less than 120 mg/dL in patients receiving concomitant insulin and metformin HCl tablets, USP. Further adjustment should be individualized based on glucose-lowering response.
Specific Patient PopulationsMetformin is not recommended for use in pregnancy. Metformin HCl, USP are not recommended in patients below the age of 10 years.
The initial and maintenance dosing of metformin HCl tablets, USP should be conservative in patients with advanced age, due to the potential for decreased renal function in this population. Any dosage adjustment should be based on a careful assessment of renal function. Generally, elderly, debilitated, and malnourished patients should not be titrated to the maximum dose of metformin HCl tablets, USP.
Monitoring of renal function is necessary to aid in prevention of lactic acidosis, particularly in the elderly. (See WARNINGS.)
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