Answer
Prolonged exposure can cause a lupus-like syndrome, with possible joint pain, fever, rash, blood-count changes or chest symptoms. New suggestive symptoms require prompt clinical review.
Sources for this answer
- Hydralazine 25 mg Tablets / Apresoline 25 mg Tablets — Current selected SmPCemc · Summary of Product Characteristics
- Hydralazine 20mg Powder for Concentrate for Solution for Injection/Infusion — Current selected SmPCemc · Summary of Product Characteristics