The types segment classifies SSRIs by individual active pharmaceutical ingredients, each with distinct patent histories, dosage forms, and market positioning. Fluoxetine, the first SSRI launched, still commands a sizable share due to its broad indication portfolio and generic availability. Sertraline follows closely, benefiting from strong evidence in both depression and anxiety, while paroxetine’s higher affinity for serotonin transporters sustains its niche in panic disorder. Citalopram and its S‑enantiomer escitalopram dominate the market for their favorable safety profile, driving a combined share of roughly 25 % of prescriptions. Fluvoxamine, primarily used for OCD, contributes a smaller but steady volume. Emerging generics and biosimilar entrants are compressing price margins, prompting manufacturers to focus on formulation innovation (e.g., extended‑release tablets) to preserve revenue. Understanding the distribution of these drug types is essential for the “market taxonomy” of SSRIs, as each molecule’s lifecycle stage directly influences the aggregate market valuation.