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Viagra's customers can be divided into three groups: the royal group who are satisfied with Viagra and do not want to try another product, a group which can switch to another product, and a group who discontinued using Viagra. The last group may be the easiest one for online pharmacy viagra to gain. 50% of the patient who had tried Viagra stopped using it. There are three main reasons for discontinuing with Viagra: First, some patients think the price is too high. Second, the side effect for some patients is severe. And third, some patients turn to not concern their sex life anymore. The patients who stopped Viagra because of its side effects may easily be willing to try Cialis because Cialis is proved to be safer. Since Up to 80% of the ED problem was caused by physiological conditions such as high blood pressure, cardiovascular disease and diabetes, and these patients are more likely to be subject to the side effective and tend to have more concerns about the health risk proposed by ED drugs, safer can be a very important selling point for Cialis. Those patients who think Viagra's price is too high, can be divided into two subgroups: the one think Viagra does not provide good value for $12.5 for a single sex experience in rush (they have to finish everything within 4 hours), and the one who cannot add additional several 12.5 dollars in their living expenses. The first subgroup may become Cialis's customer if they think Cialis provides good value for its price. For the switching customers and the growing new customer, Cialis will have to compete with Viagra. beta1,3 glucan with aricept and namenda 3) Summary of Value Pricing for customers what is aricept for Other expense ($ million) 500 500 500 500 500 500 500 500 500 what is aricept for Flexibility: As Dr. Andrew Yip, president of Hong Kong Society for the Study of Aging Male once said " It (Cialis) help patients to get back to a normal sex life without having to count the hours before having sex" . The instant and longer effective hours of Levitra will certainly allow couples to have a more spontaneous, romantic and casual sex life. possible side effects of aricept 0.94MM in US, spent $1067 per year on average in 2002, 1.64pills per week (Table 3). In addition, Table 2 shows that 30% of me between 40-70 people have sex twice a week. We have a ballpark estimation that people on average seek sex twice a week. beta1,3 glucan with aricept and namenda beta1,3 glucan with aricept and namendaThere are possible future competitors for Cialis, e.g. Vivus Inc.'s TA-1790, which is now in phase and NexMed's Alprox-TD proprietary cream, which is in phase 3. We believe these possible future competitors still need a relative long time to be able to enter the market and there are many uncertainties tied to them. Therefore we did not include these future drugs in our later analysis. aricept down syndrome In our sensitivity analysis, we found that the percentage of R&D expense and the percentage of Royalty rate are the most two important factors to our result. Once again, if the percentage of R&D expense and the percentage of Royalty rate change from 10% to 90% of their possible value, the corresponding output change of the NPV (output variable) will be the largest. From this perspective, we can conclude that these two input variables (the percentage of R&D expense and the percentage of Royalty rate) have the highest influence on the NPV. fari nicolas m d and aricept aricept and uk study Because we don't have the market data for Cialis, we assume that Cialis will follow the same demand curve as in Viagra. So we used two data point for Viagra to estimate the Demand Curve as: . Then we can easily find the optimal price to maximize the revenue. The optimal price is: $17.5, with the demand = 78.4 million and revenue = 1.37 billion. (Table 8) 10mg aricept Be safer. Since up to 80% of the ED problem was caused by recent studies on aricept aricept and uk study aricept and uk study beta1,3 glucan with aricept and namenda