carbon dioxide. They are products of compression of component ingredients in the form of powders into a dense mass, packaged in a blister pack, or with a hermetically sealed package with incorporated desiccant in the cap. To use them, they are dropped into water to make a solution. The powdered ingredients are also packaged and sold as effervescent powders or may be granulated and sold as effervescent granules. Generally, powdered ingredients are first granulated before being made into tablets.

There are several categories of active ingredients that may be best administered in the form of effervescent preparations:

1.  digest or disruptiveto the stomach or esophagus.

2.    pH sensitive, such as amino acids and antibiotics.

3.    oxygen, or moisture.

5.    It is used as agastrointestinal agent.