- Cardiovascular
- Cardiac dysrhythmias
- ECG changes (prolongation of the Q-T interval, T-wave inversion)
- Hypotension
- Congestive heart failure
- Neuromuscular
- Skeletal muscle spasm
- Tetany
- Skeletal muscle weakness
- Seizures
- Pulmonary
- Laryngospasm
- Bronchospasm
- Hypoventilation
- Psychiatric
- Anxiety
- Dementia
- Depression
ECG = electrocardiograph.