Formulation, characterization and in vivo evaluation of Hedera helix L., topical dosage forms.

The purpose of this study was to prepare topical formulations of micro emulsion, gel and ointment containing the Hedera helix L. extracts against asthma and to evaluate the physicochemical characteristics. A validated HPLC method was used for the analysis of blood plasma. In-vivo studies of the drugs were compared in rabbit plasma with oral dosing. Stability studies were performed for 3 months. The results showed that formulations were stable. No Skin irritation observed on rabbits. The optimized micro emulsion and gel showed fast absorption. Maximal plasma concentration (c _max ) and the maximal time to reach cmax (tmax) were 70.226μg/mL, 75.26μg/mL and 2 hours for the micro emulsion and gel, 90.11μg/mL and 1 hour for the oral drug syrup respectively. Pharmacokinetic parameters such as t _max , c _max and AUC of the selected formulations and oral dosing were significantly different (P < 0.01).