swelling of the mouth, face, lips, or tongue);
fainting; fast, slow, or irregular heartbeat; hallucinations; mental or mood changes; 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.