This drug may make you use caution engaging in activities requiring alertness such as driving or using machinery. Tell your doctor immediately if any of these unlikely but serious side effects occur: fainting, decreased sexual ability, chest pain. If excessive hypotension occurs, the patient should be placed in the supine position and, if necessary, receive an intravenous infusion of normal saline. If the patient blood pressure is not controlled with ZESTRIL alone, diuretic therapy may be resumed as described above. Times the maximum human dose based zestril acheter en ligne on body surface area in mice. This terminal phase probably represents saturable binding to ACE and is not proportional to dose. You should know that diarrhea, vomiting, not drinking enough fluids, and sweating lot can cause drop in blood pressure, which may cause lightheadedness and fainting.