In young healthy subjects salmon calcitonin (SCT), intranasally administered, increased in serum as a function of the drug administration time. The serum concentration of a 400 IU SCT dose monitored 10 min after dosing was statistically more significant when inhaled at 0000 than at other, more conventional, administration times (morning or evening). Following dosing at certain times during the day, the serum SCT was less or even questionable with the dose and under the study conditions selected. Dosing without consideration of timing may lead to reduced effect or lack of effect or perhaps ambiguity or controversy regarding the possible circumstance of a "non-absorbent subject". The circadian frequency appears to be a critical determinant of intranasal SCT absorption suggesting administration time to be an important factor in the cost/benefit ratio without the unpleasant side effects sometimes experienced through parenteral routes.
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