Heart disease drugs that relax constricted blood vessels may cause dizziness. If you get dizzy when standing or getting out of bed, sit or lie down for a few minutes. This will increase your blood pressure. Then, get up more slowly.
ACE inhibitors may increase cough. If coughing is keeping you up at night or interfering with your daily activities, contact your doctor.
Diuretics ("water pills") increase urine output. If you take a single dose of diuretic each day, take it in the morning. If you take two doses of a diuretic each day, take the second dose in the late afternoon so you can sleep through the night.
Diuretics can also cause dehydration (excessive loss of water). Signs of dehydration are dizziness, extreme thirst, dry mouth, less urine output, dark-colored urine, or constipation. If you have any of these symptoms, call your doctor. Don't just assume that you need more fluids.