Drug Uses Aldactone is a potassium sparing diuretic, also called a water pill that flushes excess salt and water from the body and controls high blood pressure. Usage Aldactone comes in a tablet form that must be taken daily. Use exactly as prescribed by your doctor. Do not stop taking the drug until you get your doctors approval. Missed Dose If you miss a dose of Aldactone, then you may take it as soon as you remember it. However, if it is nearly time for the next dose, then skip the missed dosage and continue with your regular dosage. Storage Store it at room temperature away from direct exposure to light, heat or moisture. Overdose Some of the typical symptoms of an Aldactone overdose include drowsiness, mental confusion, nausea, vomiting, dizziness, or diarrhea. You should seek medical attention immediately if you suspect an overdose. More Information Aldactone is used to control blood pressure and hence you must not stop taking it if you find relief after a few days.