From the side of the cardiovascular system: reduction of blood pressure, orthostatic hypotension, tachycardia, rarely - arrhythmia, increased circulatory disorders of the organs caused by narrowing of blood vessels. With excessive decrease in blood pressure, mainly in patients with coronary heart disease and clinically significant narrowing of cerebral vessels, myocardial ischemia (angina pectoris or myocardial infarction) and cerebral ischemia (possibly with a dynamic cerebrovascular accident or stroke) may develop.
From the genitourinary system: the development or strengthening of renal failure, the strengthening of existing proteinuria, a decrease in the volume of urine (at the beginning of the drug), a decrease in libido.
From the central nervous system: dizziness, headache, weakness, drowsiness, paresthesia, nervous excitability, anxiety, tremor, muscle spasm, mood disorders; when used in high doses - insomnia, anxiety, depression, confusion, fainting.
From the sense organs: vestibular disorders, taste disorders (eg, metallic taste), smell, hearing and vision, tinnitus.
From the digestive system: nausea, vomiting, diarrhea or constipation, epigastric pain, dry mouth, thirst, decreased appetite, stomatitis, hypersensitivity or inflammation of the cheek mucosa, pancreatitis, rarely - hepatitis, cholestatic jaundice, impaired liver function with the development of acute liver failure.
From the respiratory system: "dry" cough, bronchospasm (in patients with increased excitability of cough reflex), dyspnea, rhinorrhea, rhinitis, sinusitis, bronchitis.
Allergic reactions: skin rash, itching, hives, conjunctivitis, photosensitivity; rarely angioedema, swelling of the face, extremities, lips, tongue, throat or larynx, exfoliative dermatitis, multiforme exudative erythema (including Stevens-Johnson syndrome), toxic epidermal necrolysis (Lyell's syndrome), pemphigus (pemphigus), serositis, onycholysis , vasculitis, myositis, myalgia, arthralgia, arthritis, eosinophilia.
From the hematopoiesis: anemia, a decrease in the concentration of hemoglobin and hematocrit, thrombocytopenia,leukocytopenia, neutropenia, agranulocytosis, pancytopenia, hemolytic anemia. A decrease in the number of red blood cells can occur. Depression of the bone marrow.
Other: cramps, alopecia, hyperthermia, sweating.
Laboratory indicators: hyperkreatininemia, increased urea nitrogen levels, increased activity of "hepatic" transaminases, hyperbilirubinemia, hyperkalemia, hyponatremia, extremely rare - an increase in the antinuclear factor titer.
Influence on the fetus: impaired fetal kidney development, decreased fetal and newborn infants, impaired renal function, hyperkalemia, skull hypoplasia, oligohydramnion, limb contracture, skull deformity, lung hypoplasia.