A simple, sensitive and validated HPLC method has been developed to determine esomeprazole and domperidone in tablet dosage form. The chromatographic separation was achieved on a hyperchrome C-18 column column (4.6 x 150mm, 5 particle size) analytical column using a mixture of acetonitrile: Phosphate buffer (pH 5.0) in the ratio of 60:40 (v/v) used as the mobile phase, at a flow rate of 1.0 ml/min and detector wavelength at 290 nm. The validation of the proposed method was carried out for specificity, linearity, accuracy, precision, limit of detection, limit of quantitation and robustness. Linearity of method was found to be in concentration range 10-50 g/ml for esomeprazole and 5-25 g/ml for domperidone with correlation coefficient greater than 0.9999. The retention time of domperidone and esomeprazole was found to be 2.92 and 3.91 min respectively. The method can be used for simultaneous determination of esomeprazole and domperidone."

We carried out a QSAR study on benzotriazine derivatives & studied 28 potent GABAA receptor ligands; derivatives of benzotriazines, using a combination of various physicochemical, steric, electronic and thermodynamic descriptors to determine the quantitative correlation between binding affinity and structural features with potent anticonvulsant activity. Correlation between these properties and anticonvulsant activity was used to synthesize compounds possessing potent anticonvulsant activity. Most of the compounds showed an ability to inhibit the maximum electroshock (MES) and pentylenetetrazole (PTZ)-induced convulsions. Compound 1A, i.e. 2-(4-Chloro-phenyl)-5-nitro-1H-benzimidazole exhibited maximum activity.

A new, simple, accurate, precise and reproducible UV spectrophotometric method is being developed for the simultaneous estimation of amlodipine besylate, olmesartan medoxomil and hydrochlorthiazide in tablet dosage form. The stock solutions were prepared in methanol. The max for amlodipine besylate, olmesartan medoxomil and hydrochlorthiazide were 238.5nm, 256.5nm and 271.5nm respectively. The amlodipine besylate, olmesartan medoxomil and hydrochlorthiazide obeyed Beer's law in concentration range of 5-25ug/ml, 6-30ug/ml and 5-25ug/ml respectively. Results of analysis of simultaneous equation method were analyzed and validated for various parameters according to ICH guidelines.

Every year many new drugs and newer drug combinations enter the pharmaceutical area. Analytical methods for these new and first timer drugs are mostly confined only to the manufacturing company. However, availability of multiple analytical methods for the same drug/drug combinations in their formulations is always advantageous. Moreover, development of such methods helps in training the analysts for skillfully handling the sophisticated analytical instruments and the way for research approach. The present work is also planned on similar lines. A simple, precise, rapid and accurate Reversed-Phase High Performance Liquid Chromatography method is developed for the simultaneous estimation of Amlodipine Besylate, Olmesartan Medoxomil and Hydrochlorthiazide in dosage forms. Chromatography is carried out isocratically at 25 C 0.5 C on Liquid chromatographic system from Young Lin 9100 comprising of hyperchrome C-18 column (4.6 x 250mm, 5 particle size), manual injector, YL 9110 quaternary pump and Photodiode array YL 9160 detector connected to software YL clarity. Parameters such as linearity, precision, accuracy, recovery and specificity are studied as reported in the ICH guidelines.