Table 3.

Mean recovery of chlorpheniramine maleate, paracetamol and caffeine in the presence of tablet excipients

Chlorpheniramine maleate		Paracetamol		Caffeine
Amount added (µg/mL)	Mean recovery (%) ± SD	Amount added (µg/mL)	Mean recovery (%) ± SD	Amount added (µg/mL)	Mean recovery (%) ± SD
10	98.00 ± 1.30	50	102.2 ± 0.80	10	101.7 ± 1.10
20	100.95 ± 1.25	150	99.50 ± 1.50	20	100.75 ± 0.95
40	99.65 ± 0.95	300	100.90 ± 0.88	40	99.99 ± 1.25

These concentrations were injected in triplicates using 1.25 µg/mL of cyanocobalamine as internal standard