Which of the following tablets dissolve in water?

Effervescent tablets are specifically designed to dissolve in water. They contain ingredients, such as citric acid and sodium bicarbonate, which react when mixed with water to produce carbon dioxide gas. This reaction not only helps the tablet dissolve more quickly but also creates a fizzy solution that is often flavored, making it more palatable for patients.

Other types of tablets, such as coated tablets and extended-release tablets, are formulated to dissolve in the gastrointestinal tract rather than in water. Coated tablets have a protective layer that may enhance swallowing or prevent irritation, while extended-release tablets are designed to release their active ingredients slowly over time to maintain consistent drug levels in the bloodstream. Delayed-release tablets are similarly designed to bypass the stomach and dissolve in the intestines, allowing for targeted drug delivery. Therefore, effervescent tablets stand out from these other types due to their unique formulation that facilitates rapid dissolution in water.