seizure;
severe or persistent dizziness or drowsiness;
severe or persistent headache or
vomiting; shallow, slowed, or difficult breathing; tremor; trouble urinating; vision changes.
Dilaudid
All medicines may cause side effects, but many people have no, or minor, side effects. Check with your doctor if any of these most COMMON side effects persist or become bothersome when using Dilaudid:
Constipation; dizziness, drowsiness; dry mouth; flushing; lightheadedness; nausea; sweating; vomiting.