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Drug

Quercetin

50 flagged reaction(s) · 414 total co-reports · max PRR 16.5
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 Brain Fog 14 16.5 16.7 signal
2 Temperature Intolerance 9 15.1 15.3 signal
3 Seasonal Allergy 11 13.4 13.5 signal
4 Increased Tendency To Bruise 6 11.2 11.2 signal
5 Skin Laceration 7 11.1 11.2 signal
6 Muscle Atrophy 8 10.9 11.0 signal
7 Pharyngeal Swelling 6 10.8 10.8 signal
8 Anaphylactic Shock 16 10.7 10.9 signal
9 Micturition Urgency 7 10.6 10.7 signal
10 Rotator Cuff Syndrome 7 9.3 9.4 signal
11 Therapy Partial Responder 8 9.1 9.2 signal
12 Sinus Congestion 7 8.9 8.9 signal
13 Spinal Pain 6 8.8 8.8 signal
14 Blood Pressure Abnormal 10 8.7 8.7 signal
15 Bladder Disorder 5 8.6 8.7 signal
16 Drug Ineffective For Unapproved Indication 28 8.6 8.8 signal
17 Nerve Injury 5 7.7 7.7 signal
18 Ageusia 11 7.6 7.6 signal
19 Intentional Dose Omission 12 7.5 7.6 signal
20 Sensory Disturbance 7 7.5 7.5 signal
21 Angioedema 19 7.4 7.5 signal
22 Vitreous Floaters 4 7.1 7.1 signal
23 Product Dose Omission In Error 11 7.0 7.1 signal
24 Panic Attack 14 6.6 6.7 signal
25 Hereditary Angioedema 4 6.5 6.6 signal
26 Mood Swings 12 6.5 6.5 signal
27 Sleep Disorder Due To A General Medical Condition 6 6.4 6.4 signal
28 Throat Tightness 10 6.4 6.4 signal
29 Impaired Driving Ability 4 6.0 6.1 signal
30 Skin Haemorrhage 5 6.0 6.0 signal
31 Libido Decreased 4 5.5 5.6 signal
32 Hot Flush 24 5.5 5.6 signal
33 Eye Inflammation 3 5.5 5.5 signal
34 Skin Fissures 6 5.5 5.5 signal
35 Coeliac Disease 3 5.2 5.3 signal
36 Product Physical Issue 6 5.2 5.2 signal
37 Ovarian Cyst 3 5.1 5.1 signal
38 Full Blood Count Decreased 6 5.1 5.1 signal
39 Akathisia 4 5.0 5.0 signal
40 Eye Irritation 15 4.6 4.7 signal
41 Dermatitis Atopic 12 4.1 4.2 signal
42 Syringe Issue 4 3.9 3.9 signal
43 Prostatic Specific Antigen Increased 3 3.7 3.7 no signal
44 Therapeutic Response Shortened 6 3.2 3.2 signal
45 Exposure Via Skin Contact 4 3.0 3.0 no signal
46 Withdrawal Syndrome 7 2.8 2.9 signal
47 Injection Site Urticaria 4 2.8 2.8 no signal
48 Injection Site Swelling 10 2.3 2.3 signal
49 Menstruation Irregular 3 1.9 1.9 no signal
50 Injection Site Haemorrhage 8 1.7 1.7 no signal