Methods Nifedipine (Mean ± SD)* Atenolol (Mean ± SD)* Tenolate® SR Capsules Claimed to contain 20 mg Nifedipine and 50 mg Atenolol Batch No. 12746 PLS 100.50 ± 0.85 100.78 ± 1.07 PCR 100.60 ± 0.96 100.72 ± 1.09 HPLC 99.77 ± 0.56 100.90 ± 1.23

*Average of 3 determinations.

Table 8: Application of the proposed methods to Tenolate SR® capsules (20 mg Nifedipine/50 mg Atenolol).