Usual dose	50 milligrams (mg) a day	10 mg a day	10 mg a day

Maximum doses	100 mg a day	20 mg a day	20 mg a day

Available as	20 mg, 25 mg, 50 mg and 100 mg tablets	2.5 mg, 5 mg, 10 mg and 20 mg tablets	5 mg, 10 mg and 20 mg tablets

How to take	Without food	Without food	With or without food

When to take	30 to 60 minutes before sexual activity	30 to 60 minutes before sexual activity	30 minutes before sexual activity

Duration of effects	Up to four hours	Up to four hours	24 to 36 hours

How often to use	Up to once a day	Up to once a day	Up to once a day

Side effects	Headache, flushing, indigestion, stuffy or runny nose, upset stomach, diarrhea	Headache, flushing, indigestion, stuffy or runny nose, upset stomach, dizziness	Headache, indigestion, back pain, muscle aches, flushing, stuffy or runny nose

Warnings	Do not take with nitrates (Nitro-Dur, others), or if you have certain heart valve problems. Should be used with caution or not used at all with alpha blockers. Should not be used with some antibiotic, antiviral or antifungal medications.	Do not take with nitrates (Nitro-Dur, others) or alpha blockers (Hytrin, Cardura, others), or if you have certain heart valve problems. Should be used with caution or not used at all with alpha blockers. Should not be used with some antibiotic, antiviral or antifungal medications.	Do not take with nitrates (Nitro-Dur, others) or alpha blockers (Hytrin, Cardura, others), or if you have certain heart valve problems. Should be used with caution or not used at all with alpha blockers. Should not be used with some antibiotic, antiviral or antifungal medications.

Shelf life	2 years	3 years	1 year

Alcohol interaction	Not recomended	Not recomended	Not recomended

Special conditions	Sexual stimulation	Sexual stimulation	Sexual stimulation

Ranking	2nd Place	3d Place	1st Place

Cialis vs Viagra vs Levitra: Which is better?

Cialis, Viagra and Levitra work in the same way. The three erectile dysfunction medications all work towards inhibiting PDE-5, which will then keep cGMP levels high enough to supply adequate blood to the penis to create an erection.

No matter what the cause of a man's erectile dysfunction, all three drugs have high success rates in producing erections. The question still remains – which of the three medications is the best?

Some people claim that Levitra shows results faster than Viagra, and that it can be absorbed better after a meal. All three drugs produce the same side effects except for one or two differences. All three drugs are also not to be mixed with any kind of nitrate. It is also not advisable to mix PDE-5Is with doxazosin, but in Cialis, it is strictly prohibited.

In most studies it has been determined that when asked to select between Cialis and Viagra, most men chose Cialis because it may be taken even after eating, and its effects last much longer.

(European Urology 2004; 45:499-509; Clin Ther 2003; 25:2724-37; Clin Ther 2003; 25:2709-23.)

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