Validated Stability Indicating RP-HPLC Method for Simultaneous Estimation of Codeine Phosphate and Chlorpheniramine Maleate from Their Combined Liquid Dosage Form

Table 2

Filter compatibility results (assay % w/w).

Compound	Centrifuged	PVDF filter 0.22 𝜇m (Millipore)	Nylon filter 0.22 𝜇m (Macherey-Nagel)
CP	99.5	99.3	99.3
CPM	100.3	100.5	100.4