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Foscarbidopa Side Effects

The most commonly reported side effects of foscarbidopa include fall, infusion site reaction, and hallucination, based on 1,470 FDA adverse event reports from 2024 to 2025. 3.6% of reports found the drug to be ineffective.

Foscarbidopa side effects

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

1
Fall8.6%127
2
Infusion Site Reaction8.3%122
3
Hallucination7.7%113
4
On And Off Phenomenon7.6%112
5
Infusion Site Pain7.1%105
6
Infusion Site Erythema7.0%103
7
Dyskinesia6.5%96
8
Device Issue6.4%94
9
Infusion Site Infection5.6%82
10
Malaise5.0%74
11
Tremor4.7%69
12
Death4.4%64
13
Catheter Site Pain4.3%63
14
Infusion Site Induration4.1%61
15
Mobility Decreased3.9%58

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

Report severity

61.0%Serious896 reports
37.1%Hospitalizations545 reports
8.2%Fatal120 reports

Seriousness is determined by the reporter, not by OpenClaim.

Foscarbidopa drug interactions

Other drugs that appear in adverse event reports alongside foscarbidopa. 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
Foslevodopa98.5%1,448
2
Carbidopa2.3%34
3
Levodopa2.2%33
4
Pimavanserin1.7%25
5
Rotigotine0.4%6
6
Istradefylline0.4%6
7
Opicapone0.3%5
8
Pramipexole-dihydrochloride0.3%5
9
Amantadine0.3%4
10
Trihexyphenidyl-hydrochloride0.1%2
11
Cephalexin0.1%2
12
Rasagiline-mesylate0.1%2
13
Sulfamethoxazole0.1%2
14
Trimethoprim0.1%2
15
Metronidazole0.1%2

Taken alongside

1
Carbidopa17.9%263
2
Levodopa15.9%234
3
Amantadine6.7%99
4
Ergocalciferol6.6%97
5
Cyanocobalamin4.9%72
6
Acetaminophen4.7%69
7
Levothyroxine-sodium4.6%68
8
Gabapentin4.4%65
9
Aspirin4.1%61
10
Quetiapine-fumarate4.1%61
11
Clonazepam4.0%59
12
Atorvastatin-calcium3.6%53
13
Mirtazapine3.3%49
14
Duloxetine-hydrochloride3.1%45
15
Pantoprazole-sodium2.9%43

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 foscarbidopa side effects

37.6% of foscarbidopa adverse event reports involve female patients and 52.2% involve male patients. The largest age group is elderly at 59%. These figures reflect who reports side effects, not underlying risk.

Sex

Female37.6%
Male52.2%
Unknown10.3%

Age group

< 20.0%
2–110.0%
12–170.0%
18–6441.3%
65+58.7%

What is foscarbidopa used for

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

AdhesionBipolar I DisorderDyskinesiaHallucinationOn And Off PhenomenonParkinson^s DiseaseParkinsonismProduct Used For Unknown IndicationPsoriasisSkin ReactionSomatic Hallucination

Foscarbidopa brand names and reporting trend

Foscarbidopa is sold under the brand name Vyalev.

Brand names

Vyalev14

Quarterly reports (20242025)

20242025

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

Taking foscarbidopa with another medication?

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