You can Try Alka-Seltzer Plus Maximum Strength Cough & Mucus DM for FREE! Here is how to get this FREEBIE – purchase the Alka-Seltzer Plus Maximum Strength Cough & Mucus DM between now and February 24th, 2019, then submit an online request with the image of UPC and your sales receipt before March 10th, 2019 and you will receive a rebate check via mail.