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Clin Ther. 1999 Oct;21(10):1678-87.
Metformin as secondary therapy in a defined population with type 2 diabetes.

Brown JB, Pedula KL.

Kaiser Permanente Center for Health Research, Northwest Division, Portland, Oregon 97227-1110, USA.

This study was undertaken to assess the effect of metformin as a second-line oral antihyperglycemic agent in a defined population with type 2 diabetes mellitus. We measured the extent and circumstances of metformin use in the 15,000-person diabetes registry of a large, group-model health maintenance organization (HMO). Among subsets of patients in whom adequate glycemic control could not be maintained with sulfonylurea (SU) therapy, we compared glycemic control before and after metformin use to glycemic control during a similar interval before metformin was introduced. Metformin users were significantly more likely than nonusers to have had poor glycemic control at baseline. Nearly two thirds (63.8%) of patients with a glycosylated hemoglobin (Hb A1c) level >10% switched to metformin, as did 46.3% of those with an Hb A1c level of 8% to 10%. In all patients (metformin users and nonusers) in whom SU therapy failed to maintain glycemic control, Hb A1c levels decreased 0.9% after metformin was introduced, compared with a decrease of 0.4% during the control period. In a group-model HMO that promoted the use of metformin as second-line therapy in patients unable to maintain glycemic control with SU therapy, metformin reduced hyperglycemic levels.

online pharmacy ref source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=10566564&dopt=Abstract

agu.edu.bh.Bahrain

OBJECTIVE: To determine drug prescription patterns and the extent of conformity with World Health Organization/international Society of Hypertension (WHO/ISH) guidelines in diabetic hypertension. DESIGN: Retrospective prescription-based survey. SETTING: Seven primary-care health centers, comprising approximately one-third of primary-care health centers in Bahrain. PATIENTS: Patients with type 2 diabetes and hypertension. MAIN OUTCOME MEASURE: The prescribing pattern of antihypertensive and antidiabetic drugs. RESULTS: Among a study sample of 1,463 patients with type 2 diabetes and hypertension, antidiabetic agents were prescribed as monotherapy in the following descending order: glyburide, gliclazide, insulin, and metformin. As combinations, sulfonylureas plus metformin was most popular, followed by metformin plus insulin, and sulfonylureas plus insulin. Sulfonylurea and metformin with insulin was rarely used. There was no significant difference in prescribing of glyburide and metformin between the elderly and young middle-aged diabetic patients; many patients older than 65 years were treated with a beta-blocker along with a long-acting sulfonylurea. Both as monotherapy and in overall use, beta-blockers, angiotensin-converting enzyme (ACE) inhibitors, and calcium-channel blockers were most often prescribed. Among 35.5% patients treated with antihypertensive combinations, various two- and three-drug combinations of beta-blockers, ACE inhibitors, calcium-channel blockers, and diuretics were often used. The proportion of patients taking atenolol 100 mg/d was higher with combination regimens. Hydrochlorothiazide 25 mg or equivalent thiazide diuretics were extensively used. CONCLUSIONS: The prescribing pattern of antihypertensives in diabetic hypertension differs in many instances from WHO/ISH guidelines, especially regarding the choice of antihypertensive drugs and their combinations. The appropriateness of antidiabetic drug choice is questionable in relation to the antihypertensive used.

online pharmacy ref source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11724081&dopt=Abstract




Acta Diabetol Lat. 1990 Jan-Mar;27(1):11-22.
Comparative study of the therapeutic effects of glibenclamide or the fixed combination of glibenclamide-phenformin with those of gliclazide or chlorpropamide.

Raptis AE, Tountas N, Yalouris AG, Hadjidakis D, Zaharis A, Miras K, Raptis SA.

Second Department of Internal Medicine-Propaedeutic, Athens University, Evangelismos Hospital, Greece.

This study was designed to compare the therapeutic effects of glibenclamide or the fixed combination of glibenclamide-phenformin with those of gliclazide, chlorpropamide or biguanides in non-insulin-dependent diabetes. It is divided into two parts: a) in the retrospective study (473 subjects), glucose control of patients who were transferred from chlorpropamide, gliclazide, glibenclamide, glibenclamide + biguanide or metformin to the fixed combination glibenclamide-phenformin in the same tablet (2.5 mg and 25 mg, respectively) was monitored. A statistically significant decrease of blood glucose and glycosylated hemoglobin values was found under the combination of glibenclamide-phenformin contained in the same tablet in contrast to the values obtained with the treatment with glibenclamide, gliclazide, chlorpropamide, combination of glibenclamide and biguanides, metformin, and insulin. b) In the prospective study (57 subjects), the patients were transferred from chlorpropamide or gliclazide to glibenclamide for 3 months and then reallocated to the previous treatment for 3 additional months. It was found that under glibenclamide, glucose control was significantly better than under chlorpropamide or gliclazide. In conclusion, glibenclamide, a second generation sulfonylurea, and the fixed combination glibenclamide-phenformin in the same tablet are more effective compared to the other antidiabetic agents here studied and lead to a better control of type II diabetic patients. There was no increase in plasma lactic acid concentration in all patients studied before and after having received the fixed combination of glibenclamide-phenformin in the single tablet form.

online pharmacy ref source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=2110711&dopt=Abstract












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