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Independent analysis of NHS open data
PharmaInsight

Olanzapine vs Fluphenazine decanoate

National NHS prescribing compared (Prescription Cost Analysis)
Data updated May 2026

Olanzapine was dispensed 217,708.0× as often as Fluphenazine decanoate in May 2026 — 217,708 items versus 1 in England.

217,708items

Olanzapine · May 2026

NHSBSA Prescription Cost Analysis

1items

Fluphenazine decanoate · May 2026

NHSBSA Prescription Cost Analysis

Figure 1. Olanzapine versus Fluphenazine decanoate: national items dispensed by month

▬ Olanzapine   ·   ╌ Fluphenazine decanoate

0 118k 237k Jan 2021 Nov 2021 Sep 2022 Jul 2023 May 2024 Mar 2025 May 2026 Fluphenazine dec… 217,708 Jan 2021: 214k Feb 2021: 202k Mar 2021: 227k Apr 2021: 219k May 2021: 208k Jun 2021: 221k Jul 2021: 222k Aug 2021: 212k Sep 2021: 219k Oct 2021: 211k Nov 2021: 218k Dec 2021: 227k Jan 2022: 216k Feb 2022: 202k Mar 2022: 227k Apr 2022: 214k May 2022: 220k Jun 2022: 216k Jul 2022: 215k Aug 2022: 221k Sep 2022: 218k Oct 2022: 217k Nov 2022: 220k Dec 2022: 220k Jan 2023: 221k Feb 2023: 203k Mar 2023: 230k Apr 2023: 207k May 2023: 220k Jun 2023: 224k Jul 2023: 217k Aug 2023: 223k Sep 2023: 217k Oct 2023: 221k Nov 2023: 224k Dec 2023: 221k Jan 2024: 228k Feb 2024: 214k Mar 2024: 217k Apr 2024: 223k May 2024: 228k Jun 2024: 215k Jul 2024: 236k Aug 2024: 224k Sep 2024: 218k Oct 2024: 233k Nov 2024: 222k Dec 2024: 228k Jan 2025: 234k Feb 2025: 208k Mar 2025: 218k Apr 2025: 221k May 2025: 228k Jun 2025: 221k Jul 2025: 235k Aug 2025: 216k Sep 2025: 228k Oct 2025: 234k Nov 2025: 216k Dec 2025: 237k Jan 2026: 228k Feb 2026: 210k Mar 2026: 228k Apr 2026: 224k May 2026: 218k

Source: NHSBSA Prescription Cost Analysis, to May 2026

Olanzapine versus Fluphenazine decanoate, May 2026
Measure Olanzapine Fluphenazine decanoate
Items, May 2026 217,708 1
Items, last 12 months 2,693,982 37
Net ingredient cost, May 2026 £440,809 £598

See the full profile for Olanzapine or Fluphenazine decanoate.