Answer
Abrupt stopping can cause nausea, vomiting, sweating, insomnia, recurrence of symptoms and abnormal movements. Changes should normally be supervised.
Sources for this answer
- Promazine Hydrochloride 50mg/5ml Oral Syrup — Current selected SmPCemc · Summary of Product Characteristics
- UK GovernmentUK Government · Reputable Web
General medicine information. Follow the instructions for your own medicine and speak to a pharmacist or clinician about your individual circumstances.