Allergic reactions are possible. When taking high doses orally: hyperemia of the face and upper body, paresthesia, dizziness, blood flushes to the skin of the face, arrhythmia, orthostatic hypotension, diarrhea, dry skin and eye mucosa, hyperglycemia, hyperuricemia, myalgia, nausea, vomiting, peptic ulcer, debilitating itching. With prolonged use - fatty liver disease, hyperuricemia, decreased glucose tolerance, increased concentrations in the blood of aspartate aminotransferase, lactate dehydrogenase, alkaline phosphatase, a feeling of heat, hyperemia of the skin (especially face and neck), headache, dizziness, asthenia.