Get emergency medical help if you have signs of an allergic reaction (hives, severe stomach pain, difficult breathing, swelling in your face or throat) or a severe skin reaction (fever, sore throat, burning in your eyes, skin pain, red or purple skin rash that spreads and causes blistering and peeling).
Call your doctor at once if you have:
a light-headed feeling, like you might pass out;
little or no urinating;
high potassium--nausea, weakness, tingly feeling, chest pain, irregular heartbeats, loss of movement; or
liver problems--stomach pain (upper right side), loss of appetite, dark urine, jaundice (yellowing of the skin or eyes).
Common side effects may include:
headache; or
cough.
This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.
 Benazepril side effects (more detail)
