Answer
The product information warns of possible reduced effectiveness of oral contraceptives. Ask a clinician or pharmacist about precautions, especially if vomiting or diarrhoea occurs.
Sources for this answer
- Ampicillin 500 mg powder for solution for injection — 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.