• Cialis is a revolutionary new drug used to treat Erectile Dysfunction. Levitra seems to work for men with many different types of erectile dysfunction.
  
  
• Cialis works faster in about 15 minutes. It lasts a lot longer, helping men get erections for 24 hours. Levitra stayed active and working in the system for an average of 12 hours in patients 65 years or older, and 9 and a half hours in younger participants.
  
  
• Cialis works chemically in the same way as Viagra, but erection is achieved more quickly using a smaller dose. It also lasts much longer. Levitra acts in the same way as Viagra, by blocking an enzyme called phosphodiesterase-5, or PDE-5. This helps the smooth muscles in the penis to relax, which effectively increases blood flow.
  
  

  DRUGS	CIALIS	LEVITRA	UPRIMA	VIAGRA
  Manufacturer	Lilly Icos	Bayer	Abbott Laboratories	Pfizer
  Date Introduced	Feb 2003	April 2003	June 2001	March 1998
  Dosage	5mg,10mg,20mg	5mg, 10mg,20mg	2mg,3mg	50mg,100mg
  Average Approx. Absorbtion Rate	20 Minutes	40 Minutes	20 Minutes	40 Minutes
  Duration Of Effectiveness	36 Hours	4 Hours	4 Hours	4 Hours
  Reported Side Effects	Headache, Myalgia, Dyspepsia, Back Pain	Headache, Flushing, Dyspepsia, Nasal Congestion	Headache, Nausea, Dizziness	Congestion, Diarrhea, Flushing, Headaches, Urinary Tract Infection, Bluish Vision
  Contraindications	Any Nitrate-Based Medicine, Angina, Hypertension, Hypotension	Any Nitrate-Based Medicine	Angina, Myocardial Infarction, Anti-Hypertensive Nitrates	Any Nitrate-Based Medicine

  
  
• Cialis impotence pill lasts longer than Viagra and has more spontaneity. Levitra, by comparison, works for 72-90 per cent of men the first time and goes on to work 95 per cent of the time.
  
  
• Cialis claims less side effects than Viagra. But many users complained about 'facial flushing', others said it didn't work after a meal, while some complained that the drug turned their vision blue. Levitra comes with side effects that have been associated with headache, facial flushing, and mild indigestion.
  
  
• Cialis is available in 10mg and 20mg. 4 comp. whereas Levitra is available in 5mg, 10mg and 20 mg. 4 or 8 comp.