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Average User Review Score
* Based on 2289 reviews from across the web.

Cetirizine /sɛˈtɪrᵻziːn/ (trade names Zirtec, Zyrtec, Reactine) is a second-generation antihistamine used in the treatment of hay fever, allergies, angioedema, and urticaria. It is a major metabolite of hydroxyzine, and a racemic selective H1 receptor antagonist.

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* Extracted from FDA Adverse Event Reports for all drugs with the same active ingredients.

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Druginformer Identified Side Effects: Headache, Tinnitus

Effectiveness Rating:     Overall Rating:

Posted By Paul on December 27, 2019 @ 9:21 am

After using this to control a very bad allergy, which it did, I started getting ringing in the ears and severe headacheso that lasted all day, every other day. The headaches involve my neck as well. I am stopping use after a two years of use. I hope I get better. As bad as the allergy is it is better than the tinnitus and headaches. I only wish I would have figured this out a year ago

Druginformer Identified Side Effects: Tremor, Headache, Dizziness, Nausea, Pain, Chills, Vomiting, Loss of consciousness, Anxiety, Visual impairment, Euphoric mood, Dyspnoea, Insomnia, Pyrexia

Posted By Anonymous in askapatient.com on September 3, 2015 @ 12:00 am

Side Effects: Nausea and dizzy I cant go outside I fant every time I try..can eat cant sleep my nerves system cant stop shaking headache eyes blurry light headed cheats pain shortness of breath vomit...

Druginformer Identified Side Effects: Abnormal weight gain, Lethargy, Abdominal distension, Depression, Mood altered

Posted By Anonymous in askapatient.com on September 1, 2015 @ 12:00 am

... when I found this site and read all of the comments. I've been experiencing all of the same symptoms but never contributed them to taking Zyrtec. I've gained a lot of weight, I'm always bloated and ga...

Druginformer Identified Side Effects: Nasal dryness, Somnolence

Posted By Anonymous in askapatient.com on August 28, 2015 @ 12:00 am

Side Effects: Dry nose, nasal crusting, blood in nose, mild drowsiness This stuff works well on hay fever, maybe a little too well because I can only take half a pill and I'll be good for a...

Druginformer Identified Side Effects: Thought withdrawal, Increased appetite, Somnolence

Posted By Anonymous in askapatient.com on August 24, 2015 @ 12:00 am

... It's like my brain was sleeping. I gave up and slept for 2 hours after a full 8 hours of sleep the night before. I am normally a high energy person so I thought I was losing my mind until I realized...

Druginformer Identified Side Effects: Lethargy, Depression, Irritability

Posted By Anonymous in askapatient.com on August 15, 2015 @ 12:00 am

Side Effects: Irritability, severe depression, lethargy. On this for probably 15 years after trying so many others that either didn't do the job of muting the allergies or their side effect...

Druginformer Identified Side Effects: Sleep disorder, Nightmare, Screaming, Rash, Scratch, Haemorrhage, Seasonal allergy

Posted By Anonymous in askapatient.com on July 29, 2015 @ 12:00 am

Side Effects: My son was experiencing seasonal allergies and rashes due to moving into a rental that previously had cats and dogs. After many sleepless nights of scratching himself to the point of bl...

Druginformer Identified Side Effects: Hypersomnia, Pruritus, Mood swings, Anger, Depression, Insomnia

Posted By Anonymous in askapatient.com on July 16, 2015 @ 12:00 am

... of days ago, and many side effects described were eerily similar to what I've experienced these past couple of years. Bad temper, mood swings, depression, insomnia and sleeping too much were things I ...

Druginformer Identified Side Effects: Somnolence

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

Side Effects: Drowsiness. Could not stay awake with this medication. Would sleep for 10-12 hours and still feel tired after getting out of bed. I even tried splitting the pill to make 5 mg ...

Druginformer Identified Side Effects: Sleep disorder, Insomnia, Mood altered

Posted By Anonymous in askapatient.com on July 3, 2015 @ 12:00 am

... for her outburst. I am still going to have her see a therapist just in case it is so something else. I think the medicine has a lot to do with her outburst though and her lack of sleep ...

* 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.