As with all medications, Dilaudid can cause side effects. Common side effects include nausea, dry mouth, vomiting, increased sweating, constipation, dizziness, lightheadedness, and dizziness. The serious side effects that warrant immediate medical attention include shallow or slowed breathing, seizures, fainting, amount of urine changes, mood or mental changes, severe stomach or abdominal pain, hallucinations or confusion, difficulty urinating, fast or slowed heartbeat, and vision changes.
Though rare, an allergic reaction is possible. If one occurs, the patient may experience trouble breathing, rash, severe dizziness, itching, or swelling of the tongue, face, or throat.