Drug
Quercetin
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 |