Answer
No. It acts against susceptible bacteria, not viral infections such as colds or flu.
Sources for this answer
- NHSNHS · NHS medicine guidance
- Phenoxymethylpenicillin 250 mg Tablets (PL 43461/0073)(POM) — Current selected SmPCemc · Summary of Product Characteristics
General medicine information. Follow the instructions for your own medicine and speak to a pharmacist or clinician about your individual circumstances.