Zestril is a medicine known as an angiotensin-converting enzyme (ACE) inhibitor. Zestril is used alone or in combination with other medications to treat high blood pressure or heart failure. Also, it is used after a heart attack to improve survival in some people.
Zestril can cause a rare but serious allergic reaction leading to extreme swelling of your face, lips, tongue, throat, or gut (causing severe abdominal pain). You may have an increased risk of experiencing these symptoms if you have ever had an allergy to ACE inhibitor-type medicines or if you are African American. If you experience any of these symptoms, seek emergency medical attention immediately.
Tell your doctor if you experience lightheadedness, especially during the first few weeks of Zestril therapy. If you faint, stop taking Zestril and tell your doctor immediately.
Vomiting, diarrhea, fever, exercise, hot weather, drinking alcohol, excessive perspiration, and dehydration may lead to an excessive fall in your blood pressure. Tell your doctor if you experience any of these.
Zestril may decrease your blood neutrophil (type of blood cells that fight infections) levels, especially if you have a collagen vascular disease (such as lupus [disease that affects the immune system]) or kidney disease.
Promptly report any signs of infection (such as sore throat or fever) to your doctor.
Zestril may not work as well in African Americans, who may also have a higher risk of side effects. Contact your doctor if your symptoms do not improve or if they become worse.