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The strength equivalency between the 1.0, 2.0, and 3.Omg XR tablet given as a single buy xanax echeck oral dose of 6mg of alprazolam has been demonstrated.
• From the Clinical Pharmacology and Biopharmaceutics perspective, the pharmacokinetic parameters (the overall AUC, Cmax, and Cmin) following the twice daily (bid) dosing are bracketed by those from XR (qd) and IB. (qid) regimens when same daily dose is administered.
However, these data analyses have some limitations, i.e., the time-course of the effect was not taken into consideration. Specifically, from the steady-state alprazolam plasma concentration profiles, plasma concentrations followed XR (bid) dosing are consistently the highest among three treatments (XR bid, XR qd , and IR qid) between the hours of 14 -24 over a 24-hour time span if the time-course after the dosing is considered. However, the potential impact on the safety from these sustained higher alprazolam levels is unknown and needs to be further evaluated by the Clinical Division. • The PK of alprazolam were influenced by the circadian variation, but the result of this influence was a function of the oral formulation.
The IR formulation exhibit a delayed and reduced mean peak concentration after nighttime administration while the XR formulation exhibit an earlier and higher mean peak concentration. • From Clinical Data Summary section: The sponsor did not formally explore the gender-effect on the safety/efficacy measures for XR tablet and there is no information in this regard in the IR tablet (label). However, the by-sex analysis of 4 clinical trials showed that both males and females treated with Xanax XR tablet had significant greater improvement in their overall clinical condition than males and females treated with placebo. Gender has minimal effect on either the treatment-emergent or discontinuation emergent adverse event. • Gender has no effec t on the PK hydrocodone on line of alprazolam (IR and XR). • No PK or safety/efficacy study was performed in special populations with XR tablet. However, this reviewer agrees with Hossain's conclusion that the factors (such as age, hepatic or renal impairment, drug-drug interaction) that may affect the PK of alprazolam after the administration of IR tablets would not hydrocodone on line be expected to change with the administration of XR tablets since the metabolism of alprazolam is not affected by the absorption rate (IR versus XR) and alprazolam is extensively metabolized with minimal unchanged drug found in the urine. • No drug-drug interaction study was performed with the XR tablet to evaluate the PK or safety/efficacy.
New literature-based drug-drug interaction information between alprazolam IR and CYP3A4 inhibitors (ketoconazole, itraconazole, and erythromycin), and CYP3A4 inducer (carbamazepine) were hydrocodone on line submitted and incorporated in the label. •No meaningful comparison of PK or safety/efficacy response by race can be made since the majority of patients that participated in the 4 placebo-controlled efficacy trials including pivotal study (#369) were white (>85%). Similarly, themajority of subjects that participated in BA/BE studies were White.
•Results from food-effect studies how does hydrocodone interact with coumadin indicated that food taken immediately before the dosing of 3 mg XR tablet significantly affects the bioavailability of alprazolam by increasing hydrocodone on line Cmax (an average of 21- 26% with 90% Cl of 116-135 which fell outside of goal post) and shortening tmax (an average of a 21-34% earlier tmax).
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