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Potassium channel blocker

Fampridine

Brand names: Fampyra

Adult dose

Dose: 10mg BD (12h apart) on empty stomach
Route: PO
Frequency: BD

Clinical pearls

  • Walking difficulty in adults with MS; 4-week trial — discontinue if no benefit
  • Specialist MS prescribing

Contraindications

  • History of seizures
  • Renal impairment (CrCl ≤80 mL/min)
  • Concurrent OCT2 inhibitors (cimetidine)

Side effects

  • Seizures (dose-dependent)
  • UTI
  • Insomnia
  • Dizziness
  • Headache

Interactions

  • Cimetidine (OCT2 inhibitor — avoid)
  • Other lower-seizure-threshold drugs

Monitoring

  • Walking improvement (e.g. T25FW)
  • U&E

Reference: BNF; NICE TA833; SmPC; https://bnf.nice.org.uk/drugs/fampridine/. Verify against your local formulary and the latest BNF before prescribing.

Related

Curated clinical cross-links plus same-class fallbacks.