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Antazoline Side Effects

The most commonly reported side effects of antazoline include upper gastrointestinal haemorrhage, loss of consciousness, and autoimmune thyroiditis, based on 29 FDA adverse event reports from 2004 to 2025.

Antazoline side effects

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

1
Upper Gastrointestinal Haemorrhage10.3%3
2
Loss Of Consciousness10.3%3
3
Autoimmune Thyroiditis10.3%3
4
Epistaxis6.9%2
5
Diarrhoea6.9%2
6
Syncope6.9%2
7
Dyspnoea6.9%2
8
Erythema6.9%2
9
Blood Pressure Decreased6.9%2
10
Nausea6.9%2
11
Off Label Use6.9%2
12
Colonic Polyp3.4%1
13
Drug Interaction3.4%1
14
Gastritis3.4%1
15
Gastrointestinal Haemorrhage3.4%1

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

Report severity

75.9%Serious22 reports
27.6%Hospitalizations8 reports
3.4%Fatal1 reports

Seriousness is determined by the reporter, not by OpenClaim.

Antazoline drug interactions

Other drugs that appear in adverse event reports alongside antazoline. 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
Prednisolone10.3%3
2
Docetaxel10.3%3
3
Tinzaparin-sodium10.3%3
4
Bevacizumab10.3%3
5
Atezolizumab10.3%3
6
Paclitaxel6.9%2
7
Dexamethasone6.9%2
8
Iopromide6.9%2
9
Levothyroxine-sodium3.4%1
10
Allopurinol3.4%1
11
Alprazolam3.4%1
12
Infliximab3.4%1
13
Amlodipine3.4%1
14
Efavirenz3.4%1
15
Emtricitabine3.4%1

Taken alongside

1
Acetaminophen41.4%12
2
Betamethasone31.0%9
3
Indapamide31.0%9
4
Sulfamethoxazole31.0%9
5
Loperamide-hydrochloride27.6%8
6
Ciprofloxacin27.6%8
7
Fexofenadine-hydrochloride27.6%8
8
Prochlorperazine24.1%7
9
Amlodipine24.1%7
10
Cholestyramine24.1%7
11
Clonazepam24.1%7
12
Dextromethorphan24.1%7
13
Sodium-iodide-i-13124.1%7
14
Famotidine24.1%7
15
Hydrocortisone24.1%7

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 antazoline side effects

37.9% of antazoline adverse event reports involve female patients and 58.6% involve male patients. The largest age group is adult at 62%. These figures reflect who reports side effects, not underlying risk.

Sex

Female37.9%
Male58.6%
Unknown3.4%

Age group

< 20.0%
2–110.0%
12–170.0%
18–6461.5%
65+38.5%

What is antazoline used for

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

ConjunctivitisProduct Used For Unknown IndicationPremedicationProduct Used For Unknown IndicationRash

Antazoline brand names and reporting trend

Antazoline is sold under the brand name Vasocon-a.

Brand names

Vasocon-a28

Quarterly reports (20042025)

20042025

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

Taking antazoline with another medication?

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