Drug

Clemastine Fumarate

52 flagged reaction(s) · 938 total co-reports · max PRR 62.8

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	Toxic Epidermal Necrolysis	61	62.8	65.8	signal
2	Cytokine Release Syndrome	46	37.4	38.7	signal
3	Conjunctivitis	35	29.5	30.3	signal
4	Cytomegalovirus Infection	25	23.3	23.7	signal
5	Stevens-johnson Syndrome	28	19.5	19.9	signal
6	Mouth Ulceration	23	16.9	17.2	signal
7	Blood Lactate Dehydrogenase Increased	17	16.5	16.7	signal
8	Circulatory Collapse	15	13.6	13.7	signal
9	Gamma-glutamyltransferase Increased	19	13.3	13.4	signal
10	Leukopenia	41	12.7	13.1	signal
11	Rash Maculo-papular	18	12.6	12.7	signal
12	Cardiovascular Disorder	20	12.1	12.3	signal
13	Leukocytosis	13	11.1	11.2	signal
14	Blood Creatinine Increased	47	11.1	11.5	signal
15	Blister	40	11.1	11.4	signal
16	Drug Reaction With Eosinophilia And Systemic Symptoms	18	10.9	11.0	signal
17	Infusion Related Reaction	45	10.5	10.9	signal
18	Polyneuropathy	7	9.1	9.2	signal
19	Basal Cell Carcinoma	9	8.9	9.0	signal
20	Cyanosis	9	8.8	8.9	signal
21	Ileus	7	8.8	8.8	signal
22	Coronary Artery Disease	16	8.1	8.2	signal
23	Angioedema	22	7.7	7.8	signal
24	Cardiac Failure	40	7.7	7.9	signal
25	Sensory Disturbance	8	7.7	7.7	signal
26	Bronchospasm	7	7.6	7.6	signal
27	Agranulocytosis	9	7.5	7.6	signal
28	Anaphylactic Reaction	26	7.3	7.5	signal
29	Metastases To Central Nervous System	6	7.3	7.3	signal
30	Anaphylactic Shock	12	7.2	7.3	signal
31	Platelet Count Increased	6	7.1	7.1	signal
32	Eosinophilia	8	7.1	7.1	signal
33	Pelvic Pain	8	6.8	6.8	signal
34	Haematoma	11	6.5	6.6	signal
35	Multi-organ Failure	7	6.2	6.2	signal
36	Erythema	80	6.0	6.3	signal
37	Anorexia	5	5.9	5.9	signal
38	Neutropenia	49	5.6	5.8	signal
39	Lymphopenia	5	5.5	5.5	signal
40	Neurotoxicity	6	5.3	5.4	signal
41	Peritonitis	7	5.2	5.3	signal
42	Grand Mal Convulsion	3	5.0	5.0	signal
43	Thrombotic Microangiopathy	3	4.8	4.8	signal
44	Ischaemic Stroke	5	4.3	4.3	signal
45	Lactic Acidosis	8	3.9	3.9	signal
46	Tuberculosis	3	3.6	3.6	no signal
47	Premature Baby	7	3.6	3.6	signal
48	Blood Glucose Abnormal	4	3.3	3.4	signal
49	Palmar-plantar Erythrodysaesthesia Syndrome	4	2.6	2.7	no signal
50	Multiple Sclerosis	8	2.6	2.6	signal
51	Injection Site Swelling	9	1.8	1.8	no signal
52	Drug Exposure During Pregnancy	3	1.3	1.3	no signal