Answer
Overdose can cause profound sleepiness, severe low blood pressure, agitation, seizures or coma. Obtain emergency medical help immediately and take the medicine container.
Sources for this answer
- Promazine Hydrochloride 50mg/5ml Oral Syrup — 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.