| Reaction | |
|---|
| Schizophrenia (13) | |
| Sedation (111) | |
| Seizures (334) | |
| Sensory disturbances (7) | |
| Serotonin syndrome (60) | |
| Sexual fantasies (1) | |
| Shivering (32) | |
| Sleep apnea (3) | |
| Sleep disturbances (56) | |
| Sleep-related disorder (61) | |
| Sleep-related eating disorder (SRED) (7) | |
| Sleepwalking (see somnambulism) | |
| Slurred speech (9) | |
| Somnambulism (sleepwalking; noctambulism) (18) | |
| Somnolence (drowsiness) (361) | |
| Speech disorder (17) | |
| Spinal cord compression (2) | |
| Spinal cord infarction (1) | |
| Spinal shock | |
| Status epilepticus (37) | |
| Status gelasticus (3) | |
| Stroke / cerebral infarction (81) | |
| Stupor (7) | |
| Stuttering (dysphemia) / stammering (20) | |
| Subarachnoid hemorrhage (10) | |
| Subdural hemorrhage (12) | |
| Suicidal ideation (108) | |
| Syncope / fainting (181) | |
