Quality assessment of various brands of losartan potassium tablets sold in Uyo Metropolis
Keywords:Angiotensin II receptor antagonist, AT1 receptor, Assay, losartan potassium
Background: Losartan potassium is a non-peptide angiotensin II receptor antagonist with high affinity and
selectivity for the AT1 receptor, used for the management of hypertension, diabetic nephropathy as well as
hypertension with left ventricular hypertrophy. Various brands of Losartan potassium were assayed to reveal their
conformity with compendia requirements and assure that the brands are of acceptable standards for human
Methods: Qualitative and quantitative analyses of ten (10) brands coded A-J of Losartan potassium sold in Uyo
metropolis were carried out using standard physical and ultraviolet (UV) spectrophotometric methods
Results: All the brands tested met the official requirements for uniformity of weight. Brand I failed the
disintegration test by British Pharmacopeia specification (disintegration within15 mins.) but conformed to the
United States Pharmacopeia specification (disintegrated within 30 mins.). Only brand J complied with official
dissolution specification (>80% at 30 mins.) when 0.1 N HCl was used as the dissolution medium, whereas, all
the brands except brand F (<80%) complied when distilled water was used. The calibration curve for reference
Losartan potassium in methanol was linear over a concentration range of 0.00-50 µg/mL with correlation
coefficient of 0.985. All the brands passed the British Pharmacopoeia (BP) and United States Pharmacopoeia
(USP) requirements for percentage drug content of 98.5% to 101.5% and 95.0% to 105.0% respectively.
Conclusion: The brands performed creditably well in their physical characteristics and percentage recoveries. The
assay method in this study was simple, inexpensive, and reproducible and can be routinely used to assay Losartan
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