Differences between Viagra, Cialis and Levitra

Among various health problems in men, impotence or Erectile Dysfunction (ED) is foremost in being a big talk of the day today.Patients with ED report great success with Viagra, Levitra, and Cialis. All three drugs have been approved for the treatment of ED by the Food and Drug Administration, and are available through a regular or an online pharmacy.

The NIH cites a wide range of conditions that account for almost three-quarters of reported cases of ED. Diabetes, kidney disease; chronic alcoholism, multiple sclerosis, atherosclerosis, vascular disease, and neurologic disease are common causes of ED.

Viagra, Levitra and Cialis work in much the same way. Chemically known as phosphodiesterase inhibitors, these drugs enhance the effects of nitric oxide, a chemical messenger that relaxes smooth muscles in the penis. This increases the amount of blood and allows a natural sequence to occur — an erection in response to sexual stimulation. These medications don't automatically produce an erection. Instead they allow an erection to occur after physical and psychological stimulation. Many men experience improvement in erectile function after taking these medications regardless of the cause of their impotence.

 Viagra (sildenafil) works at treating erectile dysfunction in the first place,by blocking two specific enzymes in the body, known as PDE5 and PDE6, which exist throughout the penis. Viagra (Sildenafil), also known as "The Blue Pill", is available in 25mg, 50mg and 100mg pills. Viagra can be taken once per day, between 30 minutes to 4 hours before sexual intercourse.

Viagra's common side effects are sneezing, headaches, flushing, dyspepsia (heartburn, pain), dizziness, palpitations (when you can feel the beating of the heart), and photophobia (excessive sensitivity to light) while the more serious side effects are priapism (a painful condition when an erection doesn't stop for 4 hours), heart attacks, low blood pressure, stroke and even sudden death. There have been some cases of blindness caused by Viagra, although it is still disputed.
Viagra starts working in around 45 minutes on average, and lasts 4 hours. There are many cheap versions of Viagra available online, however many of them are illegal and fake.

Cialis (Tadalafil) has shown more effectiveness than Viagra in many cases, because Cialis is a stronger PDE5 inhibitor. A 20mg dose of Cialis is comparable to a 100mg dose of Viagra.

Common side effects of Cialis include headache, indigestion, back pain, flushing. Back pain can occur 12 to 24 hours of taking the drug; however they go away in a few days. Cialis can cause priapism as well, and vision changes (difficulty in telling the difference between green and blue colors) .

Cialis has an advantage over Viagra because it can work up to 36 hours compared to the 4 hour-effect of Viagra. As with Viagra, there are cheap generic versions available online.
 
Levitra (Vardenafil) is available in 2.5mg, 5mg, 10mg and 20mg orange colored pills. A 10mg dose of Levitra is comparable to 50mg of sildenafil.

As with Viagra and Cialis, Levitra should not be used more than once a day, and is contraindicated for men who are taking nitrates or alpha-blockers. Levitra has side effects as well, including nausea, abdominal pain, back pain, vision changes, photosensitivity, eye pain, organ swelling, high blood pressure, palpitation, rashes and priapism. Some serious side effects are heart attacks, penile tissue damage and permanent impotency.

Vardenafil hydrochloride in Levitra is a boon to the diabetes patients, who are at a greater risk of erectile dysfunction due to uncontrolled sugar in blood that impedes the blood flow to the penis. Levitra has proved to be effective even in tight situations like high blood pressure as well as diabetes type2 when other ED drugs have failed to work.