Viagra is a PDE5 inhibitor. PDE5 is an enzyme that promotes the degradation of cGMP in the blood, cGMP regulates blood volume in the penis, so reducing cGMP makes it difficult for men to get an erection. Viagra acts primarily on the circulatory and reproductive systems.

Hello doctor, for 3 days now, I often feel tired in my body, full of stomach, belching, every time I eat something, I have nausea, only eating yogurt and bread is okay. Yesterday morning when I drank milk, I vomited everything, before that I did not eat anything. I have never had this before. What's wrong with me like that?

Hello doctor, I'm male, I'm 25 years old. For almost a week now, my body has been in a state of fatigue and lethargy. 3 days ago, I started to feel anorexia, full stomach, indigestion, but when I didn't eat, I felt dizzy and dizzy.

To have a baby, fertilization between a sperm and an egg is required. The following article will provide basic information about sperm such as how long sperm can live, how many sperm are needed to get pregnant,...

Sperm is a fluid secreted from the male penis. To fertilize, they must swim through the cervix, then through the uterus to reach the woman's fallopian tubes and ovaries. How fast do sperm move? How long do sperm live?... The answer will surprise you!

According to the World Health Organization, most men's penises will produce between 39 million and 929 million sperm per ejaculation. But how much do you really know about sperm? Here, we'll debunk some common myths about sperm that you may have believed to be true.

Studies show that over the past 40 years, sperm counts in men have dropped by nearly 52%. Health experts say the problem stems from pollution, tobacco and diet,...

Couples are always wondering which method of birth control is suitable and highly effective. Vasectomy is a permanent birth control method that is highly effective and the procedure is relatively simple.

The male hormone Testosterone plays an important role in maintaining and developing typical physical and physiological characteristics in men, such as muscle strength or sexual function after puberty. So what is Testosterone and how does it affect men's health?

Chronic obstructive pulmonary disease is the fourth leading cause of death in Vietnam. Early diagnosis and timely intervention will greatly help in the treatment of the disease.

For men with low testosterone, testosterone supplementation is essential. Usually, doctors will prescribe testosterone therapy for men. Besides the benefits of testosterone supplementation, are there any potential risks?