The purpose of this investigation was to study the anti-inflammatory activities of both glycerrhitinic acid (GA) and the aqueous
licorice extract (ALE) in comparison with diclofenac sodium (DS) (10 mg/kg), using the carrageenan-induced paw edema model
in male albino rats. In addition, the anti-ulcer activities of ALE, famotidine (FT), and a combination of ALE and FT using
indomethacin-induced ulceration technique in rat stomach were investigated. Conventional DS tablets containing GA, as well
as DS chewable tablets containing either GA or ALE with different tastes were prepared. Also, rapidly disintegrating FT tablets
were prepared using direct compression and camphor sublimation methods. ALE or GA produced significant anti-inflammatory activity
similar to DS, and when taken concomitantly, there is no possible antagonism. The anti-ulcer activity of licorice was found
to be similar to that of FT in indomethacin-induced ulceration technique in rat stomach. Combination therapy of both FT and
licorice showed higher anti-ulcer activity than either of them alone. Generally, tablets containing the crosslinked sodium
carboxymethyl cellulose (AcDisol) showed more rapidly disintegrating effect than those including Sodium starch glycolate (Primojel).
The oral disintegration was very rapid for all the tested formulations. Also, the amount of FT absorbed from the oral cavity
was nearly 9 from 10 mg theoretically present in each formula. It could be concluded that both GA and ALE have anti-inflammatory
activity comparable with DS. It may be recommended to add ALE to either FT or diclofinac for more effective anti-inflammatory
or anti-ulcer formulations, respectively.
Keywords glycerrhitinic acid - licorice extract - anti-inflammatory - anti-ulcer
Published: September 20, 2005