2.1. Materials
Fexofenadine was gifted by Aventis Pharma (Pvt.) Limited,
Pakistan. Antacids were sodium bicarbonate, megaldrate, calcium
carbonate, magnesium carbonate, aluminum hydroxide,
magnesium hydroxide, magnesium trisilicate, simethicone
and calcium hydroxide and all are of pharmaceutical grade
passed through 170 Mesh Screen 0.088 mm.