Answer
Do not stop it without clinical advice. In heart failure, withdrawal is generally gradual unless a serious reaction requires urgent discontinuation under medical supervision.
Sources for this answer
- Hydralazine 25 mg Tablets / Apresoline 25 mg Tablets — 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.