Research Article
Comparative Study of Chemical Stability of Two H1 Antihistaminic Drugs, Terfenadine and Its In Vivo Metabolite Fexofenadine, Using LC-UV Methods
Figure 3
Typical chromatograms of fexofenadine (FEX) and internal standard (i.s.) in (a) the calibration solution and (b) the sample stressed in 1 M NaOH at 70°C for 180 min.
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| (b) |