New & improved Alka-Seltzer Plus Cold Effervescent Tablets dissolve quickly in hydrating water and are instantly ready to start working. This formula has improved flavor less sodium & is aspartame free. Each dose is individually wrapped and transforms in just 4oz of water into a liquid-fast medicine. After you drink the refreshing sparkling solution Alka-Seltzer Plus works quickly to relieve your worst cold symptoms: headache sore throat nasal & sinus congestion runny nose sneezing fever body aches & pains.