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Independent analysis of NHS open data
PharmaInsight

Lamotrigine vs Fosphenytoin sodium

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

Lamotrigine was dispensed 188,107.0× as often as Fosphenytoin sodium in May 2026 — 376,214 items versus 2 in England.

376,214items

Lamotrigine · May 2026

NHSBSA Prescription Cost Analysis

2items

Fosphenytoin sodium · May 2026

NHSBSA Prescription Cost Analysis

Figure 1. Lamotrigine versus Fosphenytoin sodium: national items dispensed by month

▬ Lamotrigine   ·   ╌ Fosphenytoin sodium

0 199k 397k Jan 2021 Nov 2021 Sep 2022 Jul 2023 May 2024 Mar 2025 May 2026 Fosphenytoin sod… 376,214 Jan 2021: 269k Feb 2021: 254k Mar 2021: 283k Apr 2021: 277k May 2021: 267k Jun 2021: 284k Jul 2021: 287k Aug 2021: 275k Sep 2021: 286k Oct 2021: 275k Nov 2021: 287k Dec 2021: 304k Jan 2022: 286k Feb 2022: 268k Mar 2022: 302k Apr 2022: 286k May 2022: 300k Jun 2022: 293k Jul 2022: 294k Aug 2022: 301k Sep 2022: 300k Oct 2022: 299k Nov 2022: 306k Dec 2022: 310k Jan 2023: 308k Feb 2023: 285k Mar 2023: 324k Apr 2023: 293k May 2023: 315k Jun 2023: 321k Jul 2023: 315k Aug 2023: 322k Sep 2023: 315k Oct 2023: 321k Nov 2023: 331k Dec 2023: 329k Jan 2024: 336k Feb 2024: 318k Mar 2024: 322k Apr 2024: 335k May 2024: 345k Jun 2024: 326k Jul 2024: 355k Aug 2024: 343k Sep 2024: 337k Oct 2024: 358k Nov 2024: 345k Dec 2024: 359k Jan 2025: 365k Feb 2025: 329k Mar 2025: 349k Apr 2025: 353k May 2025: 368k Jun 2025: 357k Jul 2025: 383k Aug 2025: 352k Sep 2025: 373k Oct 2025: 384k Nov 2025: 357k Dec 2025: 397k Jan 2026: 381k Feb 2026: 351k Mar 2026: 387k Apr 2026: 385k May 2026: 376k

Source: NHSBSA Prescription Cost Analysis, to May 2026

Lamotrigine versus Fosphenytoin sodium, May 2026
Measure Lamotrigine Fosphenytoin sodium
Items, May 2026 376,214 2
Items, last 12 months 4,485,415 7
Net ingredient cost, May 2026 £3,066,751 £80

See the full profile for Lamotrigine or Fosphenytoin sodium.