Viagra belongs to a class of drugs called phosphodiesterase inhibitors. Taken an hour before sexual activity, these drugs work by increasing the action of nitric oxide, a chemical that relaxes smooth muscles in the penis during sexual stimulation and allows increased blood flow. Today, with increasing use of Internet for commercial purposes, people can order Viagra or anti-ED medication from home. Buying Viagra online can protect the privacy of the buyer. This drug can be delivered to your doorstep in secret. In addition, there are some pharmaceutical companies are generous discounts for those who buy Viagra online. So, if you include people who suffer from ED and feeling painful to talk about it with your colleagues, it is better to consult a doctor and buy viagra or Viagra kaufen online.
The most common cause of erectile dysfunction is damage to tissue, nerves, blood vessels, muscles or fibrous tissue. Disorders such as diabetes, kidney disease, chronic alcoholism, multiple sclerosis and heart disease account for approximately 70% of ED cases. Erectile dysfunction is a common side effect of some medications, including blood pressure drugs, antihistamines, antidepressants and tranquilizers. According to health experts, psychological factors like stress, anxiety, guilt, depression, low self esteem, and fear of sex does not cause 20% of cases. Smoking also has been associated with ED.