Hair Loss - Let's carefully specify the meaning of a "local" effect!

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Let's carefully specify the meaning of a "local" effect! (Topicals)

posted by RonLev, 26.05.2008, 11:29

» » Bryan,
» »
» » It appears that you stand, on principle, that any drug that is
» » systemically absorbed would make topical application worthless since,
» as
» » you say "you might as well just take it orally" and be done with it.
» » However, that flies in the face of standard dermatologic practice.
» Drugs
» » in multiple therapeutic classes (all manifesting systemtic absorption)
» are
» » compounded in topical formulations to concentrate the effect at the
» point
» » of application. For example, topical corticosteroids all manifest
» systemic
» » absorption, but dermatologists use topical formulations because they
» can
» » use lower doses and still obtain effectiveness in the skin (for
» treating
» » eczema, allergic dermatitis, etc.), GRANTED that some of the steroids
» will
» » be systemtically absorbed. The same applies to topical antibiotics, et
» » al.
»
» Did you miss the whole point of my previous posts? I demonstrated to you
» with the graph from the Chen et al study that the effect of the
» topical flutamide was absolutely, positively NOT concentrated at the point
» of application. I took pains to point out that the results on both flank
» organs were IDENTICAL, even though the drug was applied only to one flank
» organ. Now do you understand the point that I've been making all along?
» The flutamide was acting in those rodent studies EXCLUSIVELY by a systemic
» route.
»
» Likewise, you are missing my point; I am not concerned about systemic activity at the flank organ--I already acknowledged that flutamide is systemically absorbed. What a dermatologist wants to know is: what is the activity of flutamide at the skin site of administration and what happens to that activity in the skin when the dose is titrated downward so that systemic activity is extinguished? (That was not the objective of Chen's experiment.)

RonLev


RonLev is located in [NA] and he is available to meet: NO


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