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Popular Brands: : Claritin, Loratadine, Claritin Reditabs, Alavert, Alavert Allergy
Official FDA Reports130,167
Social Media Events7,124
Total Posts4,387
Avg. Review Score2.56/ 5
Active Ingredients
  • Loratadine
Approved Uses *

* Extracted from Drug Label

  • Access Business Group Llc
  • Aidarex Pharmaceuticals Llc
  • Aldi, Inc
  • Amerisource Bergen
  • Bayer Healthcare Llc
Show more manufacturers

  This report is for all products sharing this active ingredient. For more details, please use our Workbench for research on individual brands like Claritin.

* Extracted from FDA Adverse Event Report


The quarterly trend chart illustrates changing levels of adverse events over time. Results from both the FDA Adverse Event Database (FAERS) and adverse events extracted from social media by Druginformer are plotted side-by-side for easy comparison.

The proportion of people completing user reviews who complained about a side effect.

The proportion of social media adverse event complaints for each adverse event type.

The proportion of FAERS (FDA) adverse event complaints for each adverse event type.

Loratadine Side Effects

  Social Media
(Online Comments)
(Reports Submitted to FDA)
Side Effect On Drug
Reports % of
Alarm Reports % of

* DrugInformer calculates alarm using a proprietary algorithm. Alarm should not be taken as an ofiicial signal from the FDA or other regulatory entity.

User Voices

The following are comments from users that experienced side effects while taking Loratadine


... to drink plenty (as in more than usual) of water to keep yourself hydrated, particularly if you exercise regularly. There have been a couple of occasions I've experienced drowsiness , but in general Cl...

Source: Claritin-D-24-Hour-Allergy-and-Congest...

View full report on Loratadine related somnolence

Did the author experience somnolence while taking claritin?

What is this?

Dry Mouth

... for me and go back to the Claritin-D that used to be a preferred drug by my insurance plan. Low and behold, it is working great. I am experiencing very little side effects (dry mouth is about it) and ...

Source: Claritin-D-24-Hour-Allergy-and-Congest...

View full report on Loratadine related dry mouth

Did the author experience dry mouth while taking claritin?

What is this?


... terrible allergies. I found that it worked pretty well, but it made me so groggy that I could barely function. So, trading scratchy eyes and congestion for being too out of it to work is ...

Source: Claritin-Reditabs-24-Hour-Allergy-10mg...

View full report on Loratadine related lethargy

Did the author experience lethargy while taking claritin?

What is this?

Tell us about your Experience with Loratadine

Thank you for sharing your experience with us!

Share Your Experience

Druginformer Identified Side Effects: Syncope

Effectiveness Rating:     Overall Rating:

Posted By Dave on November 13, 2021 @ 11:25 am

Taking as label recommended for 21 days produced extreme drowsiness and syncope events lowering heart rate to unconsciousness and blackout creating life threatening physical failure.

Druginformer Identified Side Effects: Thirst, Arthralgia, Respiration abnormal, Chills

Effectiveness Rating:     Overall Rating:

Posted By Melissa μέλισσα on May 21, 2018 @ 4:21 am

I cannot satisfy my thirst and my bladder is full, I get out of breath going up the stairs, and my left knee has sharp pain, also I’m feeling fatigued and last night I got feeling cold and shivery and had to use the electric blanke

Druginformer Identified Side Effects: Nightmare, Arrhythmia, Hypopnoea

Effectiveness Rating:     Overall Rating:

Posted By Deborah on April 17, 2018 @ 3:11 am

Only taken 3 x’s since I bought fri..both times I took at night I woke up hyperventilating, scared with racing heart after horrific nightmares...Will never take agin...

Druginformer Identified Side Effects: Amnesia

Effectiveness Rating:     Overall Rating:

Posted By Bill on March 1, 2018 @ 9:38 am

Took one tablet at 6am for a "runny nose" Peeled apples and made an apple pie and then when into my attic and ran ethernet cables for a new internet connection. Have NO memory of either activity. Next thing I remember in the afternoon trimming shrubs.

Druginformer Identified Side Effects: Akathisia

Effectiveness Rating:     Overall Rating:

Posted By Patricia on July 5, 2017 @ 10:22 am

severe agitation, irritability when forced to discontinue before allergy testing

Druginformer Identified Side Effects: Fatigue, Decreased appetite, Disturbance in attention

Effectiveness Rating:     Overall Rating:

Posted By Michelle on June 22, 2016 @ 3:31 pm

I took one tablet since I was experiencing severe hay fever. Whilst the tablet was effective (at 10 mg), the side effects are quite severe.

Druginformer Identified Side Effects: Mental blocking, Sleep disorder, Abnormal dreams, Mood altered, Drowsiness, Restless sleep

Effectiveness Rating:     Overall Rating:

Posted By Laura on April 3, 2016 @ 8:37 am

Druginformer Identified Side Effects: Feeling cold, Fatigue, Thyroiditis, Staring, Death, Depression, Loss of libido, Somnolence

Posted By Anonymous in askapatient.com on September 13, 2015 @ 12:00 am

... 3 off of Claritin and I swear I may be hornier and happier than I have ever been!. So, can Claritin ruin a marriage? Hell yes it could, unless your loved one likes cold depressed, sexually dead people...

Druginformer Identified Side Effects: Arthralgia, Back pain, Fatigue, Pain, Paranoia, Nightmare, Blood catecholamines decreased, Apathy, Depression, Hypertension, Insomnia, Irritability, Psychomotor hyperactivity, Irregular sleep phase

Posted By Anonymous in askapatient.com on September 11, 2015 @ 12:00 am

Hyperactive, racing mind and attention deficit, in that it was hard to focus on any task for long (ADHD?); increasingly aching joints to the point of real pain, then ultimately an extrem...

Druginformer Identified Side Effects: Constipation, Insomnia

Posted By Anonymous in askapatient.com on September 11, 2015 @ 12:00 am

Side Effects: Insomnia, anxiety, constipation. Medicine worked like a charm for my allergies and congestion . Made the mistake of purchasing the 24hr ones. I recommend the 12hr. I felt less...

Additional Drug Information

* Warning: The facts and figures contained in these reports are accurate to the best of our capability; however, our metrics are only meant to augment your medical knowledge, and should never be used as the sole basis for selecting a new medication. As with any medical decision, be sure to work with your doctor to ensure the best choices are made for your condition.

* About FAERS: The FDA Adverse Event Reporting System (FAERS) is used by FDA for activities such as looking for new safety concerns that might be related to a marketed product, evaluating a manufacturer's compliance to reporting regulations and responding to outside requests for information. Reporting of adverse events is a voluntary process, and not every report is sent to FDA and entered into FAERS. The FAERS database may contain duplicate reports, the report quality is variable, and many factors may influence reporting (e.g., media attention, length of time a drug is marketed, market share). For these reasons, FAERS case reports cannot be used to calculate incidence or estimates of risk for a particular product or compare risks between products.