formulations have been developed for regional delivery of drugs , for example , into a cavity such as the pelvic region , peritoneal region , or directly on organs of interest . regional delivery increases comfort and bioavailability of the drug , resulting in rapid and relatively high blood levels in the regions to be treated in the substantial absence of side effects due to the high levels required for efficacy following systemic delivery . in the preferred embodiment , these formulations consist of drug micro or nanoparticles , which may be formed of drug alone or in combination with an excipient or polymeric carrier . the excipient or polymer may be used to manipulate release rates and to increase adhesion to the affected region . the drug formulation can be applied as a dried powder , a liquid suspension or dispersion , or as a topical ointment , creme , lotion , foam or suppository .