Drug

Lecanemab

34 flagged reaction(s) · 2,013 total co-reports · max PRR 27.5

Important: Reactions below are the flagged terms from this drug’s FAERS report history (min. 3 co-reports per term) — PRR/ROR indicate disproportionality in spontaneous reporting, not causation. Data from FDA FAERS via openFDA. Last recalculated: 2026-09-14.

	Reaction	Co-reports (a)	PRR	ROR	Signal
1	Infusion Related Reaction	308	27.5	30.0	signal
2	Cerebral Haemorrhage	121	19.9	20.6	signal
3	Cerebral Infarction	78	18.8	19.2	signal
4	Brain Oedema	30	14.0	14.1	signal
5	Chills	241	12.1	12.9	signal
6	Subdural Haematoma	28	11.4	11.5	signal
7	Feeling Cold	42	8.8	8.9	signal
8	Brain Fog	19	7.6	7.7	signal
9	Subarachnoid Haemorrhage	11	6.3	6.3	signal
10	Status Epilepticus	12	6.2	6.2	signal
11	Confusional State	170	6.2	6.4	signal
12	Influenza Like Illness	74	5.3	5.3	signal
13	Ischaemic Stroke	15	4.9	4.9	signal
14	Head Discomfort	14	4.7	4.7	signal
15	Headache	477	4.5	5.0	signal
16	Aphasia	23	4.5	4.5	signal
17	Disorientation	30	4.4	4.5	signal
18	Cognitive Disorder	34	4.3	4.3	signal
19	Incontinence	6	3.3	3.3	signal
20	Generalised Tonic-clonic Seizure	9	3.2	3.2	signal
21	Tremor	89	3.1	3.2	signal
22	Fracture	10	3.1	3.1	signal
23	Dizziness Postural	5	3.1	3.1	signal
24	Lethargy	29	3.0	3.0	signal
25	Seizure	55	2.8	2.8	signal
26	Hypersomnia	13	2.7	2.7	signal
27	Vitreous Floaters	4	2.4	2.4	no signal
28	Hallucination	30	2.3	2.4	signal
29	Haemorrhage Intracranial	6	2.3	2.3	no signal
30	Pancreatic Carcinoma	10	2.0	2.0	signal
31	Delusion	5	1.9	1.9	no signal
32	Personality Change	3	1.9	1.9	no signal
33	Anger	9	1.6	1.6	no signal
34	Gastric Cancer	3	0.7	0.7	no signal