Can you drink water within 30 minutes after receiving the vaccine?

Generally, it is safe to drink water within 30 minutes after receiving a vaccine, although excessive drinking is not recommended. The detailed explanation is as follows:

Drinking water within 30 minutes after vaccination is acceptable because hydration does not affect the vaccine's efficacy or the body's immune response. Vaccines are administered via injection and take effect independently of the digestive system, where water is absorbed. There is no direct interaction between ingested water and vaccine components, nor does it disrupt the antigen structure in the vaccine. The primary purpose of the 30-minute observation period is to monitor for acute allergic reactions, and drinking water does not interfere with this monitoring. On the contrary, moderate water intake helps maintain hydration, alleviates anxiety, and prevents discomfort such as dry mouth. As long as the water is not scalding hot, it will not cause any adverse effects on the body or the vaccine.

After vaccination, keep the injection site clean and dry, and avoid rubbing the puncture site when bathing within 24 hours to prevent infection. Maintain a light and easily digestible diet, avoiding spicy or greasy foods, and consume more fresh fruits and vegetables to support nutrition. Ensure adequate rest, avoid strenuous exercise and staying up late, so that the immune system can function steadily. Monitor your physical condition closely; mild symptoms such as low-grade fever, redness, swelling, or pain at the injection site usually resolve on their own within 1–2 days. If symptoms worsen or persist, seek medical advice promptly.