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One of the forms of phosphodiesterase is termed PDE5. The prescription PDE5 inhibitors sildenafil (Viagra), vardenafil (Levitra) and tadalafil (Cialis) are prescription drugs which are taken orally. They work by blocking the action of PDE5, which causes cGMP to degrade. Who should not use vardenafil (Levitra)? Vardenafil (Levitra) can cause hypotension (abnormally low blood pressure, which can lead to fainting and even shock) when given to patients who are taking nitrates. People taking nitrates daily should not take vardenafil. Most commonly used nitrates are medications to relieve angina (chest pain due to insufficient blood supply to heart muscle because of narrowing of the coronary arteries). These include nitroglycerine tablets, patches, ointments, sprays, pastes, and isosorbide dinitrate and isosorbide mononitrate. Other nitrates such as amyl nitrate and butyl nitrate are found in some recreational drugs called "poppers." buy cialis online site buy cialis viagra pro online buy viagra online cialis online no prescription buy cialis online buy propecia online buy How Common Is Erectile Dysfunction? A much more common problem that affects the majority of men at some point in their life is the occasional failure to achieve an erection, which can occur for a variety of reasons, such as from drinking too much alcohol or from being extremely tired. buy propecia online buy What are intraurethral suppositories? Prostaglandin E1 (intraurethral alprostadil or MUSE) can be inserted in a pellet (suppository) form into the urethra to attain erections. This technique also is not popular because of occasional side effects of pain in the penis and sometimes in the testicles, mild urethral bleeding, dizziness, and vaginal itching in the sex partner. Men also need to remain standing after inserting the pellet in order to increase blood flow to the penis, and it may take 15-30 minutes to attain an erection. Prostaglandin can cause uterine contractions and should not be used by men having intercourse with pregnant women unless condoms or other barrier devices are used. This drug is now rarely used since the introduction of oral medications, however, it may play a role in management of erectile dysfunction in those who are not a candidate for oral PDE5 medications. What Are Ejaculation Disorders? There are different types of ejaculation disorders in men, including: Premature ejaculation: This refers to ejaculation that occurs before or soon after penetration, Inhibited or retarded ejaculation: This is when ejaculation is slow to occur, Retrograde ejaculation: This occurs when, at orgasm, the ejaculate is forced back into the bladder rather than through the urethra and out the end of the penis. viagra online issues buy viagra is the generic viagra online real viagra What Causes Erectile Dysfunction? Common causes of ED include diseases that affect blood flow, such as atherosclerosis (hardening of the arteries) or venous leakage (weak veins); nerve diseases; psychological factors, such as stress, depression, and performance anxiety; and injury to the penis. Chronic illness, certain medications, and a condition called Peyronie's disease (scar tissue in the penis) can also cause ED. Lifestyle: smoking is a key cause of erectile dysfunction. Smoking causes impotence because it promotes arterial narrowing. See also Tobacco and health.