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Biotech / Medical : VVUS: VIVUS INC. (NASDAQ)
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To: betty moyers who wrote (12747)8/6/1998 9:32:00 PM
From: Sal Milani  Read Replies (1) of 23519
 
Betty::<A logic problem> In your example, the number of refills in week 6 should be half of week 2 new scripts or 47.5, then 45 for week 7, and 42.5 for week 8. If one-half drop out at every refill, in week 9, one-fourth of week-1-new are ready for the second refill and the total refills is 65. At week 16, those that remain from the first group of patients will be on their third refill and the total refills will be 51.875 instead of your 432.5.
With one half dropping out at every refill, the total refills is approximately equal to the number of new scripts after about 20 weeks in your example.
I hope this helps.
Sal
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