Do not take an angiotensin-converting enzyme (ACE) inhibitor if you have had an allergic reaction to one before. Also, people who have ever had angioedema should not take an ACE inhibitor. Angioedema is the extreme swelling of the face, lips, eyelids, tongue, neck, or throat.
ACE inhibitors are usually safe for people with other types of allergies. You should still tell your doctor about all of your allergies.
Telling your doctor is the key when you have an allergy!