Testosterone is most commonly used in the United States as the
cypionate and the enanthate esters. While doctors often administer
both forms of testosterone as infrequently as every two weeks
and in some cases every month, the pharmakinetics of these drugs
show that this is inappropriate if the most consistent blood-levels
of the drugs are desired.
Testosterone
is a steroid hormone produced in the testes in men. Though it
is thought of as an exclusively male hormone and is responsible
for the development of male sexual characteristics, it is not
unique to males. Testosterone is also produced in the ovaries
and adrenal glands in women.
Testosterone levels decline gradually and because it comes on
slowly, men and women often accommodate to the symptoms and do
not realize how much they have lost. Imagine, if for a moment
you could flip a switch and feel like you did at age 25 to 30,
the change would be very evident and become more so as you get
older. It is caused by declining hormones such as testosterone.
Testosterone
is administered the following ways:
- Testosterone
injection
- Testosterone
gel
- Testosterone
cream
- Testosterone
patch
-
Testosterone pill
- Testosterone
pellet
One
study stated that 140 mg. of testosterone cypionate and testosterone
enanthate produced similar blood levels after injection, and stated
that heightened blood levels decreased to basal levels by day
ten.1 With higher doses the duration appears to increase a little
with another study stating that with an injection of 200 mg. of
testosterone cypionate blood levels reached basal levels by days
13 to 14.2
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