| Reaction | |
|---|
| Pain (293) | |
| Palinopsia / visual perseveration (4) | |
| Panic attack (20) | |
| Paralysis (22) | |
| Paranoia (27) | |
| Parasomnia (see the sleep-related adverse reactions) | |
| Paresis (8) | |
| Paresthesias (483) | |
| Parkinsonism (92) | |
| Parosmia (43) | |
| Pavor nocturnus (1) | |
| Perioral paresthesias (5) | |
| Peripheral neuropathy (155) | |
| Periventricular leukomalacia (2) | |
| Posterior reversible encephalopathy syndrome (see leukoencephalopathy) | |
| Presyncope (6) | |
| Primary central nervous system lymphoma (PCNSL) (2) | |
| Pseudohallucinations (5) | |
| Pseudoparkinsonism (1) | |
| Pseudotumor cerebri (28) | |
| Psychiatric adverse effect (9) | |
| Psychomotor impairment (8) | |
| Psychosis (143) | |
| Punding (3) | |
