Local therapeutic effect is achieved with a low level of active components in the blood plasma.
Fluorocortolone pivalate
After a single rectal application of 1 g of cream or the administration of a single suppository, the absorption of glucocorticosteroid was as much as 5% of the amount of drug applied or administered.
During the daily administration of 2 suppositories 3 times a day for 4 weeks, the content of fluocortolone in the blood plasma did not reach the level that exerts systemic influence.
Fluorocortolone pivalate is hydrolyzed by esterases, enzymes of the inflammation focus, with the formation of fluocortolone, 11-ketofluocortolone and trimethylacetic acid.
The half-lives from the plasma of fluocortolone and its metabolites after rectal administration were approximately 1.3 and 4 hours, respectively.
Fluocortolone is excreted from the body in the form of metabolites mainly along with urine.
Lidocaine
Absorption and bioavailability of lidocaine after rectal administration of the cream and suppository is about 30% and 24%, respectively.
The half-life of lidocaine from the blood plasma is 1-2 hours. In the human body
lidocaine metabolized by oxidative N-dealkylation, hydrolysis of the amide bond and hydroxylation of the aromatic ring to form 4-hydroxy-2,6-xylidine, which is the main metabolite and 70% of the drug is recovered with this urine as this metabolite.