ACEI class drugs is angiotensin converting enzyme inhibitors, is the abbreviation. acei class drugs name are followed by two words Pulley, such as captopril, benazepril, this class are belong to the ACEI class of drugs. Usually this class of drugs is more widely used in the clinic, not only for patients with hypertension can also be used for patients with heart failure, but also for patients with large amounts of proteinuria in the kidneys. acei class drugs although more widely used, but in the clinical use should also be particularly careful, several types of patients are strictly can not be used: 1, pregnant women absolutely can not be used, because it can lead to fetal malformations; 2, hyperkalemia Patients with hyperkalemia are also not allowed to use it; 3. Patients with bilateral renal artery stenosis are prohibited to use it; 4.