STP PHARMA SCIENCES - volume 5 - N° 6
Compatibility study between cephalexin monohydrate and some excipients
M.A. Hassan, J. Kaloustian, H. Ramsis, K.A. Khaled, T.H. EI-Faham, S. Shawky Tous, L. Maury and J. Joachim.
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The interaction between cephalexin mono hydrate with tablet and capsule excipients was investigated using differential scanning calorimetry. lnfrared studies were also carried out on the drug with some excipients. The effect of these excipients on the dissolution rate of cephalexin monohydrate powder was studied as well. From the results of the dissolution test, it was observed that most of the insoluble excipients (Avicel PH /0/ and PH /02, Emcocel, dicalcium phosphate, titanium dioxide and magne sium stearate) decrease the dissolution rate of the drug, while the starch has little effect on the dissolution rate of the antibiotic. On the other hand, most of the soluble excipients such as sorbitol, mannitol, Explotab and Aerosil 200 had no significant effect on the dissolution rate of the drug, while polyethylene glycol 6000 and sodium carboxymethyl cellulose decrease the dissolution rate to different extents. Differential scanning calorimetry revealed cephalexin to be compatible withAvicelPH JO/ and PH /02, Emcocel, dicalciumphosphate, titanium dioxide, magnesium stearate, starch, Explotab and sodium carboxymethyl cellulose. The interaction of cephalexin was observed with polyethylene glycol 6000, sorbitol and mannitol. The infrared studies indicated that there was no modification in the strong characteristic bands for the pure drug, while there was some modification in the weak bands (less than 600 cm·'), indicating the possible interaction between the drug and some excipients.
Key words : Cephalexin monohydrate - Dissolution - Excipients - Compatibility - Thermal analysis - Infrared spectroscopy.
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