Comparison review chart of Cialis, Levitra and Viagra. Compare below side-by-side: Drug Activation time Results summary Duration Did food reduce effectiveness? Overall star rating Cialis 20mg about 25 minutes Improved erections recorded on 84% of men 24-36 hours No Levitra 10mg about 1 hour Improved erections seen on 75% of men 4 hours No Viagra 100mg about 1 hour Improved erections seen on 74% of men on recommended starting dose 4 hours Yes

Cialis Levitra Viagra Comparison FAQ

Two more erectile dysfunction drugs, vardenafil (Levitra, made by Bayer) and tadalafil (Cialis, made by Eli Lilly), gained FDA approval in 2003. Both are inhibitors of type 5 phosphodiesterase, and so share the same basic mechanism of sildenafil (Viagra, made by Pfizer), which was approved back in 1998. Inhibition of type 5 phosphodiesterase allows vasodilation in humans, hence the erectile properties of these drugs. All three are taken orally, in preparation for sexual activity. They all act to increase blood flow in the penis in response to sexual stimulation. However, there are important differences comparing cialis, levitra and viagra: differences of reaction to the body's ingestion of food, onset of symptoms and duration of action.

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Comparison of Cialis, Levitra and Viagra

No head-to-head trial comparing Cialis, Levitra and Viagra has ever been performed to our knowledge, but a literature review has been carried out: see Gresser and Gleiter (Eur. J. Med. Res. 7:435, 2002). There are some basic differences, clearly summarised in the above table. One thing to bear in mind with the above summary table data is that a lot more data is available on Viagra (more than 1000 peer-reviewed journal articles and 20,000,000 patients treated with Viagra), but the data on Cialis and Levitra is currently more limited, but rapidly growing in volume, as the makers of the drugs intended.

To summarise, efficacy is about 70% with all three prescription drugs. The side effect profile is similar among all three prescription medicines, except that, importantly Viagra users will very occasionally experience a blue hue to their vision which is caused by inhibtion of PDE-6 in the retinal area, however the proportion of users this affects is minimal ( less thaan 0.5%). Cialis is reported to give muscle aches in approximately 5% of patients. Apart from that, typical mild side effects from vasodilation (flushing and headaches) are common to Cialis, Levitra and Viagra and only rarely caused men to quit the drugs' clinical trials (2-3% failed to complete). Cialis, Levitra and Viagra will all be unsuitable for men using organic nitrates. Overall the half-life of Cialis is very noteworthy for its length (17.5 hours), earning Cialis its nickname ‘the weekender’: one single dose taken on Friday would probably still have an effect on Sunday night.

Conclusion – Comparison of Cialis, Levitra and Viagra FAQ

Aside from the excellent safety record of Viagra and the long half-life of Cialis, the differences between the 3 drugs are not that noticeable. All seem to be safe and effective, providing that organic nitrates are avoided and the user has no existing heart problems, such as hypertension. Seek advice from a medical professional before ordering any of these drugs from an online pharmacy, and certainly before using Cialis, Levitra or Viagra.