Applies to etomidate: parenteral injection.

Side effects include:

Injection site pain, skeletal muscle movements (e.g., myoclonic, averting, tonic, or ocular movements), postoperative nausea and vomiting.

Myoclonus occurs frequently. Most episodes are mild to moderate in severity, although disturbing movements reported occasionally. Usually bilateral. Administration of IV fentanyl immediately before induction has been shown to minimize incidence of skeletal muscle movements.