Giardiasis
The regional formulary will not cover all eventualities for infections medicines choices. As with any condition; patient specific factors and sensitivities need to be considered. Please consider this regional formulary advice alongside any relevant local Board guidelines.
Treatment of giardiasis
Metronidazole
Metronidazole 400mg tablets
2g once daily for 3 days, alternatively 400mg every 8 hours for 5 days.
Prescribing Notes:
- Avoid work or other institutional/social settings until at least 48 hours after the last episode of diarrhoea or vomiting.
- Avoid swimming for 2 weeks after the last episode of diarrhoea.
- Clearance samples should not be sent.
History Notes
30/07/2026
Regional formulary chapter launched.