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Chlormezanone Side Effects

The most commonly reported side effects of chlormezanone include pain, headache, and hyperhidrosis, based on 1,029 FDA adverse event reports from 2004 to 2025.

Chlormezanone side effects

Percentages show how often each reaction appears relative to total reports for chlormezanone.

1
Pain49.9%513
2
Headache47.4%488
3
Hyperhidrosis46.1%474
4
Immunodeficiency45.8%471
5
Hepatic Enzyme Increased45.7%470
6
Hypersensitivity45.4%467
7
Food Allergy45.1%464
8
Rheumatoid Arthritis41.9%431
9
Upper Respiratory Tract Infection41.7%429
10
Asthma41.5%427
11
Rash Erythematous41.3%425
12
Off Label Use39.8%410
13
Fluid Retention36.8%379
14
Exposure During Pregnancy36.7%378
15
Fatigue36.3%374

These are voluntary reports and do not establish that chlormezanone caused these reactions.

Report severity

91.9%Serious946 reports
11.9%Hospitalizations122 reports
17.2%Fatal177 reports

Seriousness is determined by the reporter, not by OpenClaim.

Chlormezanone drug interactions

Other drugs that appear in adverse event reports alongside chlormezanone. Drugs flagged as a suspected cause appear in the first column. Drugs taken at the same time but not suspected appear in the second.

Also suspected

1
Abatacept62.4%642
2
Acetaminophen57.0%587
3
Cyclobenzaprine-hydrochloride57.0%587
4
Clonidine56.9%586
5
Bupropion56.5%581
6
Progesterone56.4%580
7
Tocilizumab56.3%579
8
Fluticasone56.1%577
9
Montelukast-sodium55.7%573
10
Ketoprofen55.6%572
11
Salmeterol-xinafoate55.6%572
12
Cetirizine-hydrochloride55.5%571
13
Nortriptyline-hydrochloride55.4%570
14
Methylprednisolone55.2%568
15
Ranitidine54.9%565

Taken alongside

1
Dolutegravir28.8%296
2
Ascorbic-acid27.4%282
3
Acetaminophen19.2%198
4
Pregabalin19.1%197
5
Tofacitinib15.8%163
6
Albuterol14.5%149
7
Fluticasone13.8%142
8
Ondansetron12.8%132
9
Gabapentin12.2%126
10
Oxycodone12.0%123
11
Diphenhydramine11.8%121
12
Pantoprazole-sodium10.3%106
13
Cyclobenzaprine-hydrochloride10.3%106
14
Bupropion9.9%102
15
Montelukast-sodium9.8%101

Co-occurrence in adverse event reports does not establish a drug interaction. Patients often take multiple medications, and these lists reflect prescribing patterns rather than causal relationships. Consult a healthcare provider about potential drug interactions.

Who reports chlormezanone side effects

76.4% of chlormezanone adverse event reports involve female patients and 11.1% involve male patients. The largest age group is adult at 88%. These figures reflect who reports side effects, not underlying risk.

Sex

Female76.4%
Male11.1%
Unknown12.5%

Age group

< 20.0%
2–110.2%
12–170.2%
18–6488.0%
65+11.6%

What is chlormezanone used for

Conditions and purposes for which patients were taking chlormezanone when the adverse event was reported.

Analgesic TherapyAnxietyAsthmaBack PainBipolar DisorderDrug Use For Unknown IndicationFeeling Of RelaxationFoetal Exposure During PregnancyIll-defined DisorderInsomniaInsomniaMuscle Relaxant TherapyOsteoporosisPainPhobia

Showing 15 of 24 indications

Chlormezanone brand names and reporting trend

Chlormezanone is sold under the brand name Trancopal.

Brand names

Trancopal1,577

Quarterly reports (20042025)

20052010201520202025

An upward trend reflects increased FAERS reporting overall, not necessarily increased risk.

Taking chlormezanone with another medication?

Ask OpenClaim about your specific drug combination. Get a sourced report using FDA data, drug labels, and medical literature.