Alka-Seltzer Plus Maximum Strength Sinus Congestion & Pain Power Fast Fizz Berry Effervescent Tablets dissolve quickly in hydrating water and are instantly ready to start working. This Alka-Seltzer Plus product targets your sinus cold needs and is available in effervescent form. Each dose is individually wrapped and transformed in just 4 oz of water into a liquid-fast medicine. After you drink the refreshing sparkling solution Alka-Seltzer Plus? works quickly to relieve your most bothersome sinus symptoms: Sinus Congestion & Pressure Nasal Congestion Headache & Body Ache Sore Throat Runny Nose & Sneezing and Cough.