Also the proposed methods were compared with the official ones [4] and [23], indicating the absence of any systematic error and no significant difference between the compared methods. Although, the official methods [4] and [23] required less time for completion, the proposed methods showed more accurate, reproducible, precise results and wider range of determinations, in addition to stability indicating method especially indirect AAS method. The proposed methods are suitable for the determination of the studied drugs in dosage forms without interferences from excipients such as starch and glucose or from common degradation products suggesting applications in bulk drug and in dosage forms analysis.