Segmentation by type differentiates the Haloperidol Decanoate API into distinct quality and physical‑form classifications that collectively define market size. The predominant class is pharmaceutical‑grade bulk API, supplied in crystalline form and meeting stringent USP‑NF specifications; it underpins the majority of manufacturing output due to its cost‑efficiency and compatibility with large‑scale injection processes. A secondary tier, USP‑grade API, is refined to higher purity thresholds and is typically reserved for premium formulations targeting markets with stricter regulatory oversight, contributing a modest share of revenue. An emerging subcategory, amorphous‑type API, offers enhanced solubility characteristics, attracting niche manufacturers developing novel delivery systems, though its current market impact remains limited. The distribution of these types—bulk (≈75 %), USP‑grade (≈20 %), and amorphous (≈5 %)—forms the core of the Haloperidol Decanoate API market taxonomy, influencing both pricing structures and capacity planning across the supply chain.