Answer
Oral metoclopramide usually begins working within about 30 to 60 minutes. Injectable treatment may act sooner.
Sources for this answer
- NHSNHS · NHS medicine guidance
- Metoclopramide 5mg/ml 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.