Most people who take an extra dose of spironolactone by accident will be fine. But there is a slight chance that your blood pressure may drop too low. Call your doctor right away if you don't feel well or have other concerns. Talking to your doctor right away is especifally important if you have kidney or liver disease.
Usually, your doctor will have you check your blood pressure at home and have you watch for symptoms for a day. Sometimes they may ask you to come into the office. Rarely, they will tell you to go to the emergency room.
Watch for symptoms of low blood pressure like nausea, dizziness, or drowsiness. Let your doctor know if you start having these symptoms.
If you are worried or don't feel okay, call your doctor right away -- especially those with kidney or liver disease!