Drugs may cause penile muscle atrophy, depending on what kind of drugs, if it is estrogenic drugs lead to penile size, then should be under the guidance of the doctor to stop taking drugs, if it is caused by taking other drugs, through the penis spongy blood flow Doppler examination to make clear, and under the guidance of the doctor to stop using the drug. Penile atrophy may be a male patient with age, the body’s androgen secretion decreases, thus appearing the phenomenon; may also be suffering from prostate disease, taking anti-androgenic drugs, may also be the body’s poor immune status, resulting in androgen secretion is too low, thus appearing the symptoms of penile atrophy. If the symptoms are serious, you should go to the hospital to clarify your condition, and be treated under the guidance of your doctor.