Testonol 40 capsule is a medication used to treat male hypogonadism caused by low testosterone levels. It is prescribed to men with known medical conditions and is injected directly into the skin or muscles under doctor's supervision. Common side effects include edema, swelling, weight gain, coughing, vomiting, increased erection, and injection site reactions. It is important to inform your doctor about any history of high blood pressure, heart attack, stroke, and other medications, as these may affect its effectiveness. Regular blood tests may be performed to monitor testosterone and prostate-specific antigen levels.