In study 2, 320 adults with bilateral axillary primary hyperhidrosis were randomized to receive either 50 Units of BOTOX (n=2 42) or placebo (n=78). Treatment responders were defined as subjects showing at least a 50% reduction from baseline in axillary sweating measured by gravimetric measurement at 4 weeks. At week 4 post-injection, the percentages of responders were 91% (219/242) in the BOTOX group and 36% (28/78) in the placebo group, p<0.001. The difference in percentage of responders between BOTOX and placebo was 55% (95% CI=43.3, 65.9).
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Overall, with the exception of Overactive Bladder (see below), clinical studies of BOTOX did not include sufficient numbers o f subjects aged 65 and over to determine whether they respond differently from younger subjects. Other reported clinical experience has not identified differences in responses between the elderly and younger patients. There were too few patients over the age of 75 to enable any comparisons. In general, dose selection for an elderly patient should be cautious, usually starting at the low end of the dosing range, reflecting the greater frequency of decreased hepatic, renal, or cardiac function, and of concomitant disease o r other drug therapy.
Pharmaceutical companies are not without blame. One reason why insurers impose step therapy is high drug prices. Botox, which is made from the toxin of certain bacteria, is much more expensive than other migraine treatments like beta blockers, which are available as generics. Botox costs about $4,800 a year, but with injection fees, treatment can cost up to $10,000 a year. “They could lower the price,” says Loder. “Their goal is to maximize return on investment for their stockholders. That’s not the same thing as maximizing benefits for patients, unfortunately.”