| Reaction | |
|---|
| Carotid artery dissection (1) | |
| Carpal tunnel syndrome (5) | |
| Cataplexy (4) | |
| Catatonia (19) | |
| Cerebellar degeneration (1) | |
| Cerebellar syndrome (5) | |
| Cerebral edema (9) | |
| Cerebral hemorrhage (28) | |
| Cerebral infarction (see stroke) | |
| Cerebral ischemia (13) | |
| Cerebral pseudoprogression | |
| Cerebral vasculitis (angiitis) (3) | |
| Cerebral venous sinus thrombosis (includes cavernous sinus thrombosis) (6) | |
| Cerebrovascular accident (25) | |
| Cerebrovascular adverse effect (3) | |
| Chiasmal neuritis (1) | |
| Chills (207) | |
| Chorea (10) | |
| Choreoathetosis (9) | |
| CNS adverse reaction (3) | |
| CNS depression (3) | |
| Cognitive impairment (60) | |
| Coma (45) | |
| Coma, myxedema (see myxedema coma under 'Endocrine/Metabolic') | |
| Compulsions (29) | |
| Confusion (170) | |
| Cytokine release syndrome / cytokine storm (9) | |
