3.1. Adsorption studies
Interactions with antacids were carried out in simulated gastric
juice, simulated intestinal juice and in buffer of pH 7.4 at
37 C. Antacids used were sodium bicarbonate, calcium
hydroxide, calcium carbonate, magnesium carbonate, aluminum
hydroxide, magnesium hydroxide, magnesium trisilicate,
magaldrate and simethicone. Analysis was conducted by adding
10 mL (1 mmol) fexofenadine solution to the dissolution
medium at zero time and after 15 min before collecting the first
sample 2 g of each antacid was added to the dissolution medium
separately in every individual set of experiment. Aliquots
withdrawn were assayed for fexofenadine contents and graphs
were plotted between drug concentration and time which
showed drug status during and at the end of the experiments.
3.1. Adsorption studies
Interactions with antacids were carried out in simulated gastric
juice, simulated intestinal juice and in buffer of pH 7.4 at
37 C. Antacids used were sodium bicarbonate, calcium
hydroxide, calcium carbonate, magnesium carbonate, aluminum
hydroxide, magnesium hydroxide, magnesium trisilicate,
magaldrate and simethicone. Analysis was conducted by adding
10 mL (1 mmol) fexofenadine solution to the dissolution
medium at zero time and after 15 min before collecting the first
sample 2 g of each antacid was added to the dissolution medium
separately in every individual set of experiment. Aliquots
withdrawn were assayed for fexofenadine contents and graphs
were plotted between drug concentration and time which
showed drug status during and at the end of the experiments.
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3.1. Adsorption studies
Interactions with antacids were carried out in simulated gastric
juice, simulated intestinal juice and in buffer of pH 7.4 at
37 C. Antacids used were sodium bicarbonate, calcium
hydroxide, calcium carbonate, magnesium carbonate, aluminum
hydroxide, magnesium hydroxide, magnesium trisilicate,
magaldrate and simethicone. Analysis was conducted by adding
10 mL (1 mmol) fexofenadine solution to the dissolution
medium at zero time and after 15 min before collecting the first
sample 2 g of each antacid was added to the dissolution medium
separately in every individual set of experiment. Aliquots
withdrawn were assayed for fexofenadine contents and graphs
were plotted between drug concentration and time which
showed drug status during and at the end of the experiments.
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