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Theophylline is metabolized extensively in the liver. [2] It undergoes N-demethylation via cytochrome P450 1A2. It is metabolized by parallel first order and Michaelis-Menten pathways. Metabolism may become saturated (non-linear), even within the therapeutic range. Small dose increases may result in disproportionately large increases in serum ...
[2] [1] Fixed-dose combinations of theophylline and ephedrine were abandoned after the 1970s as they did not allow for dose titration in asthma therapy owing to the toxicity of ephedrine. [19] The effects of theophylline/ephedrine as a performance-enhancing drug in exercise and sports have been studied.
The oral bioavailability of gabapentin enacarbil (as gabapentin) is greater than or equal to 68%, across all doses assessed (up to 2,800 mg), with a mean of approximately 75%. [ 25 ] [ 1 ] In contrast to the other gabapentinoids, the pharmacokinetics of phenibut have been little-studied, and its oral bioavailability is unknown. [ 28 ]
The therapeutic window (or pharmaceutical window) of a drug is the range of drug dosages which can treat disease effectively without having toxic effects. [18] Medication with a small therapeutic window must be administered with care and control, frequently measuring blood concentration of the drug, to avoid harm.
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As a result, the pharmacokinetics of gabapentin is dose-dependent, with diminished bioavailability and delayed peak levels at higher doses. [ 85 ] The oral bioavailability of gabapentin is approximately 80% at 100 mg administered three times daily once every 8 hours, but decreases to 60% at 300 mg, 47% at 400 mg, 34% at 800 mg, 33% at 1,200 mg ...
More recent research looked at a higher dose of minoxidil and found it wasn’t more effective. A 2021 study gave 90 men with male pattern baldness 5% minoxidil, 10% minoxidil or a placebo. The ...
It was a combination of theophylline, ephedra, [1] and hydroxyzine, and taken by mouth. [ 2 ] [ 3 ] It is no longer manufactured in the US due to approval of ephedra being withdrawn by the FDA . [ citation needed ]