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In a medicine that is administered periodically, the trough level should be measured just before the administration of the next dose in order to avoid overdosing. [3] A trough level is contrasted with a "peak level" (C max), which is the highest level of the medicine in the body, and the "average level", which is the mean level over time. It is ...
Peak-to-trough ratio in pharmacokinetics is the ratio of peak (C max) and trough (C min) levels of a drug over its dosing interval (τ) at steady state.. Peak-to-trough ratio (PTR), also known as peak-to-trough variation or peak-to-trough fluctuation, is a parameter in pharmacokinetics which is defined as the ratio of C max (peak) concentration and C min (trough) concentration over a dosing ...
Trough estradiol levels and MADRS Tooltip Montgomery–Åsberg Depression Rating Scale scores with 1 mg sublingual micronized estradiol 3 to 8 times per day (3 to 8 mg/day total; mean 4.8 mg/day total) in women with postpartum depression. [8] Blood was drawn specifically in the mornings before the first dose of sublingual estradiol for the day. [8]
C max is the maximum (or peak) serum concentration that a drug achieves in a specified compartment or test area of the body after the drug has been administered and before the administration of a second dose. [1] It is a standard measurement in pharmacokinetics.
Therapeutic drug monitoring (TDM) is a branch of clinical chemistry and clinical pharmacology that specializes in the measurement of medication levels in blood. Its main focus is on drugs with a narrow therapeutic range, i.e. drugs that can easily be under- or overdosed. [1]
At a practical level, a drug's bioavailability can be defined as the proportion of the drug that reaches the systemic circulation. From this perspective the intravenous administration of a drug provides the greatest possible bioavailability, and this method is considered to yield a bioavailability of 1 (or 100%).
Trough estradiol levels and MADRS Tooltip Montgomery–Åsberg Depression Rating Scale scores with 1 mg sublingual micronized estradiol 3 to 8 times per day (3 to 8 mg/day total; mean 4.8 mg/day total) in women with postpartum depression. Blood was drawn specifically in the mornings before the first dose of sublingual estradiol for the day.
That immediately gets the drug's concentration in the body up to the therapeutically-useful level. First day: 1000 mg; the body clears 100 mg, leaving 900 mg. On the second day, the patient takes 100 mg, bringing the level back to 1000 mg; the body clears 100 mg overnight, still leaving 900 mg, and so forth.
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