Erectile Dysfunction is one of the most frequent health problems. ED is characterized by a permanent or recurrent inability to attain maintain an erection sufficient for satisfaction of both partners during sexual intercourse. There are psychogenic and organic cases of erectile dysfunction.

Psychogenic erectile dysfunction is usually a result of "neurosis expectations" or other emotional disorders often leading to premature ejaculation and followed restriction of sexual contacts and further neurotization. Organic erectile dysfunction is caused by various somatic diseases and effects. Every second man aged 40-70 years regularly have the symptoms of erectile dysfunction. Along with erectile dysfunction and premature ejaculation, decreased libido and sexual dissatisfaction remain the most common sexual problem in men. The treatment of erectile dysfunction usually includes the application of oral medications (Viagra, Cialis, Levitra), local preparations (like Himcolin gel), vacuum pumps and surgical interventions. For the recent 10 years oral ED drugs became the most prescribed options for the treatment of erectile dysfunction.

Viagra (sildenafil) belongs to a group of medicines that delay the enzymes called phosphodiesterase from working too quickly. By controlling phosphodiesterase, sildenafil helps to maintain an erection that is produced when the penis is physically stimulated. We have all heard of the popularity of Viagra. In fact, men of all ages are finding a new found sexual youth because of the blue pill. But like any prescription medication, Viagra is not without its pitfalls and problems however. Let's take a closer look at Viagra. Viagra comes in tablet form in dosages of 25mg, 50mg and 100mg. Viagra 50mg is prescribed to be taken once a day, 30 minutes to 4 hours before intercourse. In situations where 50mg isn't effective, your doctor may prescribe 100mg to be taken once daily 30 minutes to 4 hours before intercourse.

Certain medical conditions make taking Viagra a little more difficult. In fact, certain conditions prohibit the use of Viagra all together. Here are some medical conditions your doctor must know about before you start taking Viagra.

• HIV/AIDS: Certain HIV drugs may interact with Viagra (see above)
• Arrhythmias (irregular heartbeat)
• Coronary artery disease
• Heart attack or a history of (within the last 6 months)
• High blood pressure or low blood pressure
• Stroke or a history of (within the last 6 months)-Chance of problems occurring may be increased
• Abnormal penis, including curved penis and birth defects of the penis
• Bleeding problems
• Retinitis pigmentosa (disorder of the retina)
• Conditions causing thickened blood or slower blood flow, including leukemia, multiple myeloma (tumors of the bone marrow, or polycythemia, sickle cell disease, and thrombocythemia (blood problems)
• Priapism (prolonged erection) or a history of priapism
• Heart or blood diseases
• Kidney problems (severe)
• Liver problems (severe) - Lower starting doses may be used and doses increased as needed and tolerated.