There is no safe amount of time to take potassium without side effects, according to Mayo Clinic. Potassium tablets shouldn't be taken unless an individual has a medical condition that causes a deficiency. Too much potassium has serious medical consequences, such as irregular heartbeat, difficulty breathing and muscle weakness.
Potassium deficiency is so rare that there is no recommended daily allowance for potassium provided by the FDA. Approximately 1600 to 2000 milligrams of potassium per day is generally accepted as an adequate daily amount. Potassium supplements interact with a large number of medications and medical conditions, according to Mayo Clinic.