Phosphonic acid antibiotic
Fosfomycin
Brand names: Monuril, Fomicyt
Adult dose
Dose: Uncomplicated UTI: 3g PO single dose (women); 3g x 2 doses 3 days apart (men). IV: per protocol (resistant infections)
Route: PO/IV
Frequency: single or per protocol
Clinical pearls
- Single-dose oral cure rate ~80–90% for uncomplicated UTI
- IV reserved for MDR gram-negatives in specialist settings
Contraindications
- Severe renal impairment (PO)
Side effects
- GI upset
- Headache
- Vulvovaginitis
Interactions
- Metoclopramide (reduces absorption)
Reference: BNF; NICE NG109; UK AMR guidance; https://bnf.nice.org.uk/drugs/fosfomycin/. Verify against your local formulary and the latest BNF before prescribing.
Related
Curated clinical cross-links plus same-class fallbacks.
Calculators
- Centor / McIsaac Score for Strep Pharyngitis · Throat
- Tumor Lysis Syndrome Risk (Cairo-Bishop) · Oncological Emergency
- FeverPAIN Score for Strep Throat · Throat
- Jarisch-Herxheimer Reaction Severity Assessment · Treatment Reactions
- PID Severity (CDC Diagnostic Criteria) · Gynaecological Infections
- Gustilo-Anderson Classification (Open Fractures) · Fracture Classification
Pathways
- Infective Endocarditis · ESC 2023 Infective Endocarditis Guidelines; NICE NG41
- Eczema Herpeticum · BAD; NICE CKS
- Suspected Bacterial Meningitis (Adult) · NICE NG240 (2024); NICE NG143 (paeds)
- Clostridioides difficile Colitis · NICE NG199 (2021); IDSA/SHEA 2021
- Returning Traveller — Fever · NaTHNaC; PHE; ESCMID 2018
- Malaria — Diagnosis & Management · PHE 2016; WHO 2023