Effer-K® is an effervescent liquid prescription potassium supplement in tablet form. Simply drop the tablet into a glass of water, wait one minute for the tablet to dissolve, then enjoy the non-carbonated beverage.

Effer-K® is the combination of potassium bicarbonate and citric acid as an effervescent tablet. When placed in water the citric acid and potassium bicarbonate react. The effervescent reaction provides potassium as potassium citrate in a slightly acidic solution. The initial bicarbonate molecule is bubbled off as carbon dioxide and water. Potassium citrate and water remain.