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Figure 7 Figure ILG-2 Dissolution profiles for XANAX XR 1 mg Lot 83,317 uith dissolution media of water, pH 2.0, pH 4.0, pH 6.0 and pH 7 .5. O 7.3 + 6..0 o 4.0 & 2i0 x water • Ideally, one common specification should be used for all 4 different strengths. However, in this specific case, where a strength-dependent drug release phenomenon exists, dissolution specs has is tramadol hcl to be widened to accommodate all 4 strengths. To justify this widening, an established in-vitro and in-vivo correlation (IVIVC) is required8. Since IVIVC was unsuccessful for XR tablet (188.8.131.52, page 33), the dissolution specifications will be used as QC measures and separate specifications for each strength are acceptable.
*The guidance published in September 1997 "Extended Release Oral Dosage Forms: Development, Evaluation, and Application of In Vitro/In Vivo Correlations" • This reviewer has evaluated sponsor's proposed dissolution is tramadol hcl specs at any time point against dissolution profiles from following batches used to establish BA/BE & efficacy, and support a 1 -- manufacturing site change [Details of individual dissolution profile are attached in section 7.is tramadol hcl 2.3 (page57)]: (a)Batches used in the pivotal PK/BE & efficacy studies manufactured at US site (old site, undebossed) as primary data. (b)Batches manufactured at the Arecibo, Puerto Rico (new site, undebossed) used in the BE study (data submitted under.~-; ~-~ - to support the manufacturing site, change as primary data. The dissolution profile from the biobaches for this BE study was not available. (c)Dissolution profiles from commercial final formulation (new site, 2-sided debossed) were used as supportive data. (d)Dissolution profiles from final formulation (new site, undebossed). (e)The review chemists (Drs Thomas Oliver is tramadol hcl & Lorenzo Rocca) were also asked to evaluate the sponsor's proposed dissolution specifications against the stability data. Final dissolution 3 clonazepam alprazolam 0.484656 method and specification: 1ms 3mx 0.5 mg 1 mg 1 hour 4 hours 8 hours USP apparatus I, lOOrpm, 37°C, volume 500ml, pH 6.0 buffer 4.7.2In vitro and in vivo drug release comparisons 184.108.40.206 Has the sponsor evaluated the relation between in vitro release and the in vivo performance of Xanax XR? Was is tramadol hcl the IVIVC properly developed and does it demonstrate satisfactory predictability? Yes, the sponsor attempted to evaluate the relation between in vitro release and the in vivo performance but failed to establish the IVIVC for Xanax XR tablet. However, the sponsor had indicated during the teleconference (03/22/2002).' -" , As a result, the sponsor did not submit the requested individual data and IVIVC was not reviewed. 4.7.3Manufacturing site changes (P/2002/0018) Note: •During the drug development process, there was a/ _ manufacturing site change from Kalamazoo Michigan to Arecibo, Puerto Rico.
All the XR tablets used in the PK and clinical studies were manufactured at the Upjohn Kalamazoo facility without debossing. The final commercial production with 2-sided debossing (strength & X) is planned and will be manufactured at Arecibo, Puerto Rico.
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