| Reaction | |
|---|
| Schizophrenia (13) | |
| Sedation (110) | |
| Seizures (332) | |
| Sensory disturbances (7) | |
| Serotonin syndrome (59) | |
| Sexual fantasies (1) | |
| Shivering (32) | |
| Shock (21) | |
| Sleep apnea (3) | |
| Sleep disturbances (53) | |
| Sleep related disorder (61) | |
| Sleepwalking (see somnambulism) | |
| Slurred speech (9) | |
| Somnambulism (sleepwalking; noctambulism) (17) | |
| Somnolence (drowsiness) (354) | |
| Speech disorder (17) | |
| Spinal cord compression (2) | |
| Spinal cord infarction (1) | |
| Spinal shock | |
| Status epilepticus (36) | |
| Status gelasticus (3) | |
| Stroke (80) | |
| Stupor (7) | |
| Stuttering (9) | |
| Subarachnoid hemorrhage (10) | |
| Subdural hemorrhage (12) | |
| Suicidal ideation (105) | |
| Syncope / fainting (181) | |
