The time it takes for antacids to dissolve in room temperature water can vary based on several factors, including the specific type of antacid, its formulation (e.g., chewable tablets, effervescent tablets, or regular tablets), and the water temperature. Typically, effervescent tablets dissolve quickly, often within a few minutes, while regular tablets might take longer.
In general, if you're using effervescent antacids, expect them to fully dissolve in about 1 to 5 minutes. For regular tablets, it may take anywhere from 5 to 15 minutes or longer. If you're looking for a fast reaction, effervescent formulations are your best bet.
For the most accurate information, you can also refer to the instructions provided by the manufacturer on the antacid packaging.