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Table 3 Intra-day and Inter-day precision of the proposed HPLC method ( n= 5)

From: A validated stability-indicating HPLC method for the simultaneous determination of pheniramine maleate and naphazoline hydrochloride in pharmaceutical formulations

Drugs Actual concentration ( μg mL-1) Intra-day precision Inter-day precision
Measured concentration ± SD; RSD (%) Measured concentration ± SD; RSD (%)
Pheniramine 150.0 147.8 ± 1.1; 1.0 147.6 ± 1.3; 1.2
600.0 608.5 ± 2.4; 0.4 607.0 ± 1.3; 1.0
1200.0 1194.7 ± 2.7; 0.3 1197.6 ± 7.4; 0.6
Naphazoline hydrochloride 12.5 12.6 ± 0.05; 0.4 12.5 ± 0.1; 0.9
50.0 50.3 ± 0.3; 0.5 50.4 ± 0.2; 0.4
100.0 100.1 ± 0.4; 0.4 100.4 ± 0.5; 0.5