Cialis has been taking market share from Pfizer's Viagra for a number of years now and this is not purely because of marketing initiatives from its manufacturer Eli Lilly, but also because many men who previously used Viagra find that when they try Cialis they actually prefer it.

In a sense there isn't really that much difference between Cialis and Viagra except that Cialis has a much longer working time. Cialis can work for as long as 36 hours whereas Viagra is designed only to work for four.

Men who try all three versions of the prescription erectile dysfunction medications available today namely Viagra, Cialis and Levitra end up settling on one which they say they prefer and which they feel most comfortable with.

Very often the choice of erectile dysfunction drug is a lifestyle choice because the reality is that they are all drugs that work in the same way but have different time windows and applications. For example Cialis 'Daily' is designed to be taken every morning so that men suffering from erectile dysfunction are always 'primed' for sex if need be. The regular version of Cialis is sometimes referred to as the Weekend Pill because if taken on a Friday night, it can still be effective on Sunday morning.

Viagra and Levitra are preferred by some men who like to plan their sexual activity and therefore are happy to take a tablet half an hour before sex. At the end of the day it is important to use a drug which you feel comfortable with personally.

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