Dry Powder for Suspension: Dry powder for suspension are preparations of finely powdered drug intended for suspension in liquid vehicles. They are generally reconstituted with recommended volume of purified water. A dry mixer of an Antibiotic e.g. Ampicillin, whenmixed with one or more suitable buffers, preservatives, stabilizers, sweetening agent and suspending agents suitable for reconstitution are called dry powder for suspension. It is also called dry syrup. Powders are preparation in powdered form. Powders are usually prepared by uniformly mixing drugs with or without diluents, binders, disintegrators or other suitable excipients by a suitable method to produce a pulverized or finally granulated form. If necessary coloring agents, aromatic agents, flavoring agents etc may be added.
Powders for suspension are marketed as oral reconstitutable medications in unit-dose sachet or multidose bottles. Most drugs prepared as a dry mix for oral suspension are antibiotics. They may contain excipients, in particular, to facilitate dispersion or dissolution and to prevent caking.