Answer
Yes. Diphenhydramine may cause sleepiness, dizziness, reduced concentration or unsteadiness that can continue into the next day.
Sources for this answer
- Panadol NightPain — Current selected SmPCemc · Summary of Product Characteristics
- NHSNHS · NHS medicine guidance
General medicine information. Follow the instructions for your own medicine and speak to a pharmacist or clinician about your individual circumstances.