This article is from the Impotence FAQ, by Sine Nomine llama@drizzle.com with numerous contributions by others.
Good question. No one seems to be quite sure; several people on the
newsgroup report using injectables more frequently than recommended
without any side effects. The most likely reason for the limits has
to do with US FDA regulations: unlike individual physicians, drug
companies can *only* recommend usages that are approved by the FDA,
and the only usages/dosages approved by the FDA are the ones the
company has submitted studies on. So the weekly limits reflect the
actual usages of study participants.
 
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