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Viagra, Levitra and Cialis are the 3 big drugs for treating erectile dysfunction. They all have the same mechanism of action, as they are all PDE5 inhibitors, but these 3 drugs are different in their own ways.

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. The pills cost around $10 per pill. There are many cheap versions of Viagra available online, however many of them are illegal and fake. There are cheaper, generic versions sold online (with the same side effects)

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. Cialis can cost up to $22 per pill. 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.

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. Levitra can cost up to 20 hours per pill. Fake versions are cheaper.

Because there are dangerous side effects associated with the big 3 erectile dysfunction drugs, there are many ‘herbal Viagra alternatives’ available in the market. These products are preferred over the ED drugs because while they can start working in 15-30 minutes, and last 4 hours, like Viagra, they have absolutely no side effects. This is because they are made of herbal ingredients. They are increasingly gaining popularity among impotence patients because they are very affordable, costing around $1.5 per pill.

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