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Stability of Extemporaneously Compounded Nadolol 10-mg/mL Suspension in Oral Mix in Glass and Plastic Bottles and Plastic Syringes

Author(s):  Walsh Andrea, Ziegler Blake, Lingertat-Walsh Karen, Law Shirley, Walker Scott E

Issue:  Mar/Apr 2021 - Volume 25, Number 2
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Abstract:  An oral liquid formulation of nadolol, which is required for administration to patients who cannot swallow intact tablets, is not commercially available. The objective of this study was to evaluate the stability of nadolol 10 mg/mL prepared in Oral Mix vehicle and stored in amber glass, amber polyethylene terephthalate, or amber polyvinyl chloride for 91 days at 4ÆC and 25ÆC; and polypropylene oral plastic syringes at 25ÆC only. Three separate batches of nadolol suspension 10 mg/mL were prepared with Oral Mix. Of the suspension, 50-mL aliquots were stored in 100-mL bottles (amber glass, amber polyethylene terephthalate, or amber polyvinyl chloride). Half of the bottles from each container type were stored at 25ÆC and the other half at 4ÆC. On study days 0, 2, 7, 14, 21, 28, 42, 56, 72, and 91, nadolol concentration was determined using a reverse-phase, stability-indicating liquid chromatographic method from samples drawn from each type of container at each temperature. Oral syringes (3 mL), filled with 2 mL of suspension, were stored at 25ÆC and tested on days 0, 2, 7, 21, 42, and 91. The concentration of nadolol 10 mg/mL in Oral Mix in all study samples from bottles and oral syringes remained within 3.5% of the initial concentration. Based on the fastest degradation rate with 95% confidence, on day 91, between 99% to 100% and 98% to 100% remained in suspensions stored in bottles at 25ÆC and 4ÆC, respectively. Oral syringes at 25ÆC had 94% remaining on day 91. Multiple linear regression analysis demonstrated that the percent remaining was related to study day and container, but not temperature. On day 91, nadolol 10 mg/mL oral suspensions prepared with Oral Mix and stored in all bottle types at 4ÆC will retain more than 98% of the initial concentration compared to 99% at 25ÆC and only 94% when stored in oral syringes.

Related Keywords: Andrea Walsh, PharmD, Blake Ziegler, Honors BSc, PharmD, Karen Lingertat-Walsh, BScPhm, ACPR, Shirley Law, DipPharmTech, Scott E. Walker, MScPhm, nadolol, storage containers, oral suspension, chemical stability, physical stability

Related Categories: PEER-REVIEWED, STABILITIES, COMPATIBILITIES, QUALITY CONTROL, CARDIOLOGY, DOSAGE FORMS/DRUG CARRIERS, STORAGE

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