Compliance with the application of testosterone undecanoate is generally not harmful, but some patients may experience adverse reactions such as erythrocytosis, depression, nervousness, nausea, and diarrhea during the administration of the drug. Testosterone Undecanoate is mainly used for the treatment of primary or secondary testicular hypoplasia; delayed physical puberty in boys and other disorders. Compliance with the application of testosterone undecanoate is usually not harmful. However, since testosterone undecanoate is an androgenic drug, some patients may experience adverse reactions during its use, such as erythrocytosis, depression, nervousness, emotional distress, increased libido, nausea, diarrhea, abdominal discomfort, and itchy skin. It is important to note that the drug should not be used by men with diagnosed or suspected prostate or breast cancer, as well as those who are allergic to any of the ingredients in this product. If you need to take testosterone undecanoate, you should use the medication under the supervision of a doctor and it is strictly forbidden to take it on your own.