Drug side effects
loratadine Side Effects
The reactions most often reported to the FDA for loratadine (also sold as Claritin), with demographics, serious outcomes, and reporting trends.
Data updated 2026-05-15
- 104,378
- FAERS reports
Data from the FDA Adverse Event Reporting System (FAERS), 2003 to 2025. A FAERS report records a temporal association, not proof of cause. See our methodology for how figures are compiled and de-duplicated.
The most commonly reported side effects of loratadine come from 104,378 reports to the FDA, broken down here by frequency, patient demographics, and serious outcomes.
This page analyzes 104,378 reports to the FDA Adverse Event Reporting System (FAERS) for loratadine (Claritin): the reactions reported most often, who reported them, serious outcomes such as hospitalization, and year-over-year trends. A FAERS report does not prove the drug caused the effect, and report volume tracks how widely a drug is used, not how likely an effect is for any one person. Educational information, not medical advice.
Total Reports
104,378
Reports Mentioning Death
4,537
4.3% of reports — not proof the medicine caused the death
Hospitalizations
22,504
21.6% of reports
Top Indication
Product Used For Unknown Indication
Most Reported Adverse Reactions
Who Reports Side Effects
Gender Distribution
Age Distribution
Reporting Trend by Year
Reactions in Death Reports
Top reactions reported in 4,537 reports where death was an outcome. These are voluntarily reported and do not establish causation.
| Reaction | Reports |
|---|---|
| DEATH | 1,813 |
| PNEUMONIA | 334 |
| DYSPNOEA | 262 |
| SEPSIS | 240 |
| COMPLETED SUICIDE | 232 |
| RENAL FAILURE | 214 |
| CARDIAC ARREST | 209 |
| NAUSEA | 199 |
| FATIGUE | 196 |
| RESPIRATORY FAILURE | 196 |
| ACUTE KIDNEY INJURY | 194 |
| ASTHENIA | 188 |
| DIARRHOEA | 168 |
| CHRONIC KIDNEY DISEASE | 166 |
| TOXICITY TO VARIOUS AGENTS | 164 |
| FALL | 155 |
| PYREXIA | 152 |
| PAIN | 141 |
| MYOCARDIAL INFARCTION | 138 |
Reactions in Hospitalization Reports
Top reactions in 22,504 reports where hospitalization was an outcome.
| Reaction | Reports |
|---|---|
| PNEUMONIA | 2,006 |
| DYSPNOEA | 1,947 |
| NAUSEA | 1,614 |
| FATIGUE | 1,541 |
| DIARRHOEA | 1,461 |
| PAIN | 1,312 |
| FALL | 1,218 |
| VOMITING | 1,200 |
| PYREXIA | 1,197 |
| HEADACHE | 1,190 |
| ASTHENIA | 1,127 |
| DIZZINESS | 1,049 |
| MALAISE | 875 |
| URINARY TRACT INFECTION | 874 |
| CHEST PAIN | 863 |
| COUGH | 851 |
| ANXIETY | 804 |
| WEIGHT DECREASED | 782 |
| ARTHRALGIA | 738 |
Nearby, Related Medications
What the FAERS Data Reveals About loratadine Side Effects
The FDA Adverse Event Reporting System (FAERS) contains 104,378 voluntary reports linked to loratadine and its brand equivalents (Claritin), spanning 2003 through 2025. Of those, 4,537 (4.3%) listed death as an outcome and 22,504 (21.6%) involved hospitalization. The most common indication reported alongside adverse events was Product Used For Unknown Indication.
Demographic breakdowns help contextualize who is being exposed to the drug. Of reports with known sex, 66% were female and 34% male; age distribution skews toward 45-64, with 21,289 reports in that bracket. The single most reported reaction is fatigue with 6,414 submissions, followed by nausea and headache.
How to read these numbers
FAERS is a signal-detection tool, not a scorecard. Reports are voluntary, and a single case may list multiple suspect drugs, so numbers above should not be read as incidence rates or per-patient risk. Widely prescribed drugs naturally accumulate more reports than niche therapies even when individual risk is low. These aggregates are useful for spotting patterns that merit further pharmacovigilance, not for choosing between medications. This page is for educational reference only and is not medical advice, speak with a licensed clinician about any side-effect concerns.
Drugs With a Similar FAERS Report Volume
Other medications with a total FDA adverse-event report count closest to loratadine's 104,378.
Read our methodology - how this data is sourced, computed, and verified.