Answer
Yes. NSAIDs can cause ulcers, bleeding or perforation; vomiting blood or passing black, tar-like stools requires urgent assessment.
Sources for this answer
- NHSNHS · NHS medicine guidance
- Mefenamic Acid 500 mg Tabletsemc · SmPC Current selected SmPC · Version 3
- Mefenamic Acid 50 mg/5 ml Suspension