Allergic reactions may include breathing problems, facial or throat swelling, pronounced stomach pain, or hives. These symptoms require immediate professional assistance. Patients who have bought generic altace have experienced milder side effects such as itchy skin, dizziness, coughing, insomnia, nausea and vomiting, decreased sex drive, and impotence. More serious side effects that have been noted from altace use are unusual bleeding or bruising, weakness, syncopated or slow heartbeats, fast increase in weight, jaundice, or chest pain.