 Importantly, prodrugs can belong to multiple subtypes (i.e., Mixed-Type).A Mixed-Type prodrug is one that is bioactivated at multiple sites, either in parallel or sequential steps.For example, a prodrug, which is bioactivated concurrently in both target cells and metabolic tissues, could be designated as a "Type IA/IB" prodrug (e.g., HMG Co-A reductase inhibitors and some chemotherapy agents; note the symbol " / " applied here).