Answer
Yes. It may cause colour interference in some screening tests for 5-HIAA and VMA; tell the clinician or laboratory that you take it.
Sources for this answer
- Methocarbamol 750 mg film-coated tablets — Current selected SmPCemc · Summary of Product Characteristics
- Methocarbamol neuraxpharm 750 mg — 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.