ONCE-DAILY SUSTAINED-RELEASE MATRIX TABLETS OF LOSARTAN POTASSIUM: FORMULATION AND IN VITRO EVALUATION

Prajapati B.G.¹*, Patel K.R.^2
1S.K.Patel College of Pharmaceutical Education and Research, Ganpat University, Kherva-382711, Mehsana, Gujarat State, India
²S.K.Patel College of Pharmaceutical Education and Research, Ganpat University, Kherva-382711, Mehsana, Gujarat State, India
* Corresponding Author : bhupen_27@yahoo.co.in

Received : -     Accepted : -     Published : 15-06-2010
Volume : 1     Issue : 1       Pages : 1 - 7
Int J Med Clin Res 1.1 (2010):1-7
DOI : http://dx.doi.org/10.9735/0976-5530.1.1.1-7

Keywords : Losartan potassium, HPMC K4M, HPMC K200M, Eudragit RSPO, Sustained release, Matrix tablets
Conflict of Interest : None declared

Objective of the present study was to develop hydrophilic polymer and hydrophobic polymer based matrix Losartan potassium sustained release tablet which can release the drug up to time of 24 hrs in predetermined rate. Formulation of Losartan potassium matrix tablet was prepared by the polymer combination in order to get required theoretical release profile. Influence of hydrophilic and hydrophobic polymer on Losartan potassium was studied. Formulated tablet were also characterized by physical and chemical parameters. In vitro release profile was check for 24 hrs to evaluate the SR matrix tablet of Losartan potassium. Losartan potassium (LP) is a potent, highly specific Angiotensin II type 1 (AT1) receptor antagonist with antihypertensive activity. It is readily absorbed from the gastrointestinal tract with oral bioavailability of about 33% and a plasma elimination half-life ranging from 1.5 to 2.5 hr. Administration of LP in a sustained release dosage would be more desirable for antihypertensive effects by maintaining the plasma concentrations of the drug well above the therapeutic concentration. From in vitro dissolution profile, Batch B4 was prepared with blend of HPMC K4M (67.2 mg), HPMC K200M(90mg) and Eudragit RSPO(112.5 mg), where drug release was about 94-98%. Batch B4 showed highest similarity factor values (f2 = 67.76).

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