Antacids typically start to work within seconds to minutes after taking them, providing fast relief by neutralizing stomach acid. Chewable antacids like Tums begin their acid-neutralizing reaction as soon as they are swallowed, leading to near-immediate relief of symptoms like heartburn and indigestion. Liquid antacids generally work a bit faster than tablets because they act more quickly in the stomach. The relief usually lasts for a few hours but antacids do not treat underlying causes and are meant for occasional use.

How Antacids Work Quickly

• Antacids contain alkaline substances like calcium carbonate, magnesium hydroxide, or sodium bicarbonate.
• Upon contact with stomach acid, they chemically neutralize the acid, reducing acidity and relieving burning sensations.
• This reaction happens immediately inside the stomach, so the relief can be felt very quickly.

Additional Notes

• Antacids work best if taken about 30 to 60 minutes before eating to prevent symptoms.
• The relief typically lasts up to 2 hours per dose.
• Other treatments for acid-related issues like H2 blockers or proton pump inhibitors work more slowly and have longer-lasting effects but are not instant relief options.

In summary, antacids act quickly, usually within seconds to minutes, to relieve heartburn and indigestion by neutralizing stomach acid on contact.