The Prefilled Methotrexate Injection segmentation by application delineates four principal therapeutic uses that together shape the market’s revenue profile. Rheumatoid arthritis (RA) accounts for the largest share, driven by the chronic nature of the disease, high prevalence in aging populations, and the drug’s established efficacy in disease‑modifying treatment; this segment contributes roughly 55 % of total sales. Psoriasis and psoriatic arthritis represent a growing niche, supported by expanding indications and patient‑centric delivery preferences, delivering approximately 25 % of market volume. Oncology, where methotrexate is employed in high‑dose regimens for certain solid tumours and leukemias, supplies about 15 % of the market, reflecting its specialized use and higher price points per unit. The residual other indications—including inflammatory bowel disease and ectopic pregnancy—collectively add the remaining 5 %, underscoring a modest but strategic diversification. Each application segment’s proportion directly informs production planning, pricing strategy, and geographic focus, thereby defining the overall Prefilled Methotrexate Injection market size.