Drug Ratings for ZYRTEC

Average Rating: 2.1 (1546 Ratings)

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    New! Reviews Summary for ZYRTEC  | Top 10 Adverse Effects (reported to FDA)

RATING  REASONSIDE EFFECTS FOR ZYRTECCOMMENTSSEXAGEDURATION/
DOSAGE
DATE ADDED
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 1  Allergies Thought I was just getting older but went off this drug and found it had caused extreme insomnia where I needed medication. Also made me angry for no reason. Very bad drug! Never taking again! Should be removed from market as the side effects are not work the reduced sneezes and other allergy issues. F 44 5 years
10mg
4/21/2014

 2  It was a GENERIC BRAND Terrible nightmares. And non- generic Zyrtec does not cause these night terrors! F 39 5 days
10
4/20/2014

 1  seasonal allergies Children's dye, sugar and alcohol free bubblegum flavored liquid: within 30 minutes of giving this to my 3 1/2 year old, she became angry, unreasonable and violent. She didn't sleep well for several days and the behavior changes lasted 2 days after just one dose. Oh, and several hours after taking it (just 1/2 tsp one time), she was digging on her leg with a sharpish stick, like she was trying to cut herself, but didn't have access to anything sharp enough. I will never use this medication again! F 3 1 days
1/2 tsp ch 1X D
4/19/2014

 1  seasonal allergies Children's dye, sugar and alcohol free bubblegum flavored liquid: within 30 minutes of giving this to my 3 1/2 year old, she became angry, unreasonable and violent. She didn't sleep well for several days and the behavior changes lasted 2 days after just one dose. Oh, and several hours after taking it (just 1/2 tsp one time), she was digging on her leg with a sharpish stick, like she was trying to cut herself, but didn't have access to anything sharp enough. I will never use this medication again! F 3 1 days
1/2 tsp ch 1X D
4/19/2014

 1  Sneeze attacks I took Zyrtec last Oct because I was having sneeze attacks often because of allergies I developed when I moved to LA. I took it for 6 days, I noticed on the 3rd night when I laid down to go to bed I could NOT breathe out of my nose so I just assumed I was getting a cold but by the 6th night I was in panic mode and could NOT breathe at all!!!! ...I called my sister and conf in a 24 hour pharmacists and he told me what to do to get me to breathe again and to discontinue with Zyrtec so of course I stopped!! HOWEVER Zyrtec left very strange and seems to be permanent terrible side effects!!!!! First of all I ended up with a chronic stuffed up nose because the Zyrtec dried up my inner nasel tissues so bad, then because of my nose being stuffed up from Zyrtec it caused me to go see a doctor which prescribed nasonex to try to undo what the Zyrtec had caused, this helped a little, my nose seems to always be half or all stuffed ever since I took that Zyrtec for 6 days and I can NEVER breathe out if my nose now when I sleep since I took the Zyrtec. I cannot believe I am the only person that this medicine has done this too, there's no way, if it did this to me then it has to have dried out and stuffed up other peoples noses too!!!! ...If I knew Zyrtec was going to cause me to have this stuffed up nose problem I would have never have taken it!!!!! F 43 6 days
4/17/2014
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 2  Allery-related sinusitis Depression, irritability, negative and hateful thoughts, mood swings, fatigue, difficulty getting out of bed This medicine helped my sinusitis immediately, but I was a depressed basket case while taking it. I was pissed off at everyone all the time and couldn't find a positive thought in my brain... very negative, mean, and depressed. I felt as if there were a pane of glass between the world and me... just couldn't connect. I also lost my libido -- absolutely no interest in sex. I also felt extremely exhausted for about two hours each morning, even after sleeping 9-10 hours (I was only taking 5 mg once per day, right before bed), and would just lie in bed not wanting to face the world. Once I stopped the drug, I felt normal within 24 hours. F 44 2.5 weeks
5 mg 1X D
3/28/2014
Email
 1  Allergies I will never take Zyrtec again! Talk about experiencing every crazy emotion you could possibly ever have in just one dose! My allergies have been very bad this season with intense itchy face and eyes, sneezing, couching, congestion, basically what everyone goes thru with Allergies. I dont like taking anykind of medicine at all and will avoid if possible, but I thought I was going to end up ripping my face and eyes out and needed some kind or relief a.s.a.p. Last nite I popped a zyrtec before bed, (Husbands allergy pills) within two hours I awoke right out of sleep and started to feel disoriented like I didnt know if I was really where I was. I then started to feel agitated,angry, upset, fidgety all for no reason. Here I am laying in bed its midnight, Im now wide awake with insomnia and Im feeling like I want to wake my husband up and start yelling at him. I get up and splash my face with cold water, now Im feeling scared and shaky for no reason. I try to lay back down close my eyes and convince myself everything will be okay, Im just overreacting. Out of no where my heart starts beating 240 and Im now convinced that there must be ephedrine in this zyrtec I just took. Im even convinced my Husband knew this zyrtec made you feel this way and let me take it anyway. I get up start pacing and almost thought of going to the Er in case I was having an allergic reaction. I had to try to lay back down cause my heart was beating so fast I thought I was going to pass out if I didnt tr F 39 1 days
10 mg
3/9/2014

 1  Seasonal Allergies Very vivid nightmares that would lead me to getting out of bed in a semi-conscious state. I also suffered from anxiety and paranoia. It took me so long to figure out that it was the Zyrtec D because I attributed the psychological stress to the stress of being a first-time father; I had started taking Zyrtec D about two months before my son was born. I am no longer suffering from the nasty side-effects since I stopped taking it about a month ago. It helped a lot with the seasonal allergies, but not worth the side effects! M 34 1.5 years
5mg/120mg 2X D
3/7/2014

 1  Allergic Rhinitis Deep depression, exhaustion, aching and tired limbs, suicidal thoughts. I started taking this drug to counter the effects of allergic rhinitis. I went from happy go lucky to wanting to sit in the chair and cry all day. When suicidal thoughts started to happen, I looked at what had changed and pinpointed Zyrtec as I noticed that at the end of the 24 hour period when the drug was wearing off, I started to feel better. These tablets have gone out with the rubbish, I feel a different person, the aches and pains have gone and I have my head back. I believe this is a very dangerous drug and should not be sold over the counter. I count myself lucky to not have had the other dreadful symptoms being reported on this webpage. F 64 2 days
10mg 1X D
3/3/2014
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 1  allergies and hives Weight gain, depression..blues F 53 10 years
2/26/2014

 1  Itchiness related to previous hives Heart racing and pounding After I discontinued the drug, it took a week to return to near-normal. It was an extremely unpleasant week--considered going to the ER at least once. F 67 11 days
10 mg 1X D
2/26/2014

 3  Severe Allergies My 5 year old son has been taking zyrtec for 2 years for severe allergies (tactile, seasonal and severe life-threatening allergies). He isn't able to leave the house without allergy medicine due to his high sensitivity to animal dander and other allergens. Many of my son's classmates have pets at home and, as soon as he comes into contact with them or their clothing, his eyes swell up and become itchy and red. Hives & asthma can also accompany these symptoms. The zyrtec allowed my son to get out the door every day and function without these allergic reactions. His pediatric allergist suggested I give it to him every day and that is where it all began. The zyrtec did do the job it was intended to do, I just don't think it is good for long term use (like any drug, it has it's side effects). I decided do a trial run of taking my son off of zyrtec after stumbling across many parents postings about irritability and mood changes they noticed while their child was taking zyrtec. Throughout my sons 2+ years of daily doses of zyrtec, his moods have swung from happy to sad within seconds. He also would have sudden screaming outbursts if he didn't like something we told him (something as simple as 'let's go to the park'). We're on Day 4 without zyrtec and my son (after 2 years of this roller coaster!) is starting to be much more reasonable and cooperative, and happy. He certainly still has his moments (let's remember, he's a 5 year old!) but we're noticing a huge difference already. I haven't heard one screaming outburst since we stopped zyrtec. Now we're focusing on the unbelievable itching he's experiencing at nighttime and trying to get through the next 2-3 weeks as his system is going through zyrtec withdrawal. We tried taking him off of zyrtec 6 months ago for allergy testing and we couldn't get through it due to the extreme itching. This time I'm determined to get past this phase and have been giving him a homeopathic allergy medicine every 4 hours throughout the night. I also give him a dose of the homeopathic allergy medicine in the morning before school and I'm happy to say he's done just fine with his allergies (he only has a 1/2 day of kindergarten so I'm fortunate I can monitor all this). We're taking it one day at a time but I have already decided F 34 2 years
10mg 1X D
1/2/2014

 2  cedar allergies heart palpatations,extreme fatigue,irratability,sore throat does not completely stop the running nose,or sneezing,makes me feel horrible.would not give to my kids.I taken this off an on in 2 yrs when allergies hit. F 37 2 years
10mg 1X D
1/2/2014
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 1  Head cold Tired and had vicious ghastly dreams that left me extremely frightened for several minutes after I awakened. Sad feelings during the day and even cried for no reason. Very curt with others even angered easily! Been Zyrtec free for 2 days and feeling Better. No more nightmares! This is a mind altering medicine. Will never take this medicine again! M 53 2 days
5mg
12/18/2013

 1  Allergies Anger, Anxiety, Restlessness, Irritability. My child had extreme side effects from this medication. This medication was prescribed for allergies. This medication did nothing but, change my child's behavior and personality. It was hard on my child and scared me half to death. All the negative reviews you read could happen. Not worth the risk. Find something else that has less side effects. 60 days
10 MG 1X D
12/16/2013

 1  allergies I've been taking zyrtec for seasonal allergies for 3 weeks and then stored taking them. During those 3 weeks I felt terribly depressed, I didn't want to do anything. I thought it was the allergies making me feel bad. I stopped taking it for a few months abd I felt extraordinary. Then the other day my allergies stated acting up a little so I started taking it... I sin began to have anxiety attacks for the smallest of things. M 17 3 weeks
12/7/2013

 4  seasonal runny nose & sneezing slept longer than usual which was fine because I needed it. But it seems to cause or aggravate constipation. I only use it occasionally for 1 or 2 days at a time because I get too lethargic if I use it longer. M 70 1 days
10mg 1X D
11/3/2013

 3  Cat allergies Drowsiness, weight gain, dizziness, shortness of breath, anger, mood swings, water retention, bloated and gas Works great for allergies. It stops my itchiness, no heart palpitations or dry nose/mouth but the side effects aren't wonderful. Gained 7 lbs in 1.5 month, water retention, stomach pains, bloating and gas. Go homeopathic if you can. It doesn't "work" as well but there are no side effects!!!! F 39 1.5 months
10mg 1X D
11/1/2013
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 1  Hay Fever My 3 1/2 year old who is normally full of energy and loves to joke and laugh has been taking this for the last 2 weeks because of hay fever symptoms. Since taking it his energy levels have decreased and he has started having tantrums. He is clingy and very emotional. He has been totally out of character since he has been taking the medicine. Alot of people have told me it is probably his age but I know (call it mothers intuition) that something else is causing this. Finally it clicked one night that it all started at the same time as he started taking Zyrtec. After researching it on the internet I'm finding about 9 out 10 people are having or have had this experience. I'm stopping this medicaton immediately and looking forward to my little man being himself again!! M 3 14 days
2.5Mil 1X D
10/28/2013

 2  Hay fever & sinus symptons Heart palpitations, fatigue, achy joints, unsettled sleep, headache I thought I had sinus and hay fever, Zytec made me feel like I had the flu. the heart palpitations made me feel absolute crap, all I wanted to do was sleep, just not practical with 3 small kids! F 39 3 days
10 1X D
10/27/2013
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 1  Allergies I've rated Zyrtec previously mentioning vivid very strange dreams and nightmares. After having taken it on a few more occasions I've noticed that I feel terrible after taking it. (Note that I've only taken half-pills because the full pill makes me too sleepy.) After taking it always I feel like I am not being myself, have delusions, feel angry and "high" and like a zombie at the same time. In addition, I feel very sleepy, unable to concentrate and to make decisions, and also experience strong free-floating anxiety. This leads me to conclude that this drug influences the brain in some way. It would be reasonable to have this drug off the market to fully test it's side effects. It seems other site visitors have similar experience with this drug, and it needs to be further investigated. If you are considering taking this drug, stay away! M 28 1 days
Half doze 1X D
10/25/2013

 1  allergies When my son was very young he took Zyrtec for his allergies. During this time, the smallest thing would make him get extremely upset and angry. He would throw a fit for a couple hours and nothing we could do would settle him. He had no pain tollerance as well. Our older child had to have perfect behavior with him because anything could set him off. It got so bad I thought I was going to have to take him to a therapist. He had been such an easy going child before this. Fortunately he was a very articulate child and during these episodes he would be crying saying he couldn't control how he felt and didn't know why he was so angry. I read a blog that others had written about the same reaction, unable to control anger and no pain tolerance. I immediately took him off the Zyrtec and he returned immediately back to his sweet easy going self. He has been off it for about 7 years now and is the sweetest child you could ever meet. DO NOT PUT YOUR CHILD ON ZYRTEC!!!! M 5 2 years
1X D
10/16/2013
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 1  Interstitial Cystitis Night terrors are the worst - disturbing surreal nightmares and the inability to wake myself properly from these, resulting in freaky hallucinations whilst being semi-conscious. I started with milder nightmares and these have built up to full blown terrors. Hearing things, I.e. the doorbell ringing when it isn't. Inability to get my words out and pronouncing them wrong. Random feelings of depression. Tiredness and inability to wake up properly. Forgetting things and struggling to stay focused. So lucky that my boyfriend suggested that it could be because of the tablets, god knows what would've happened if I'd've kept taking them! Horrendous. Terrified of sleeping now due to nightmares. Stopping this drug right now!! F 21 1 months
10mg
10/13/2013

 4  intense sneezing from allergies No discernible side effects. Maybe sleepiness but not that overt. I'm hoping it's the cure for sneezing attacks so violent and long lasting that they damage my vocal chords and respiratory system due to blunt trauma. M 58
10 mg 1X D
10/2/2013

 2  Allergies/asthma HORRIBLE. I've tried this drug three times now and each time things are a little worse and I'm only taking a half dose! Horrible drowsiness, anxiety, shortness of breath feelings. Despite taking it at night, I was such a zombie the next day that I could barely function. Never taking it again. The only reason I gave this two stars over one is because it actually did dry out my sinuses and mucus. Too bad being on it is sheer hell. This drug should be banned. F 31 1 days
5mg 1X D
9/18/2013

 1  seasonal allergies completely exhausted zero motivation ignoring family and children HORRIBLE HORRIBLE HORRIBLE THIS DRUG SHOULD BE ILLEGAL I HAVENT BEEN MYSELF SINCE TAKING THIS DRUG AND AM ON DAY 3 OFF ZYRTEC AND FEEL LIKE CRAP F 33 2 months
1X D
9/14/2013

 1  allergies Racing heart, anxiety, sleepless nights, irritable and feel like I'm on a bad upper. Not a good medication; I'm hesitant to take medications unless there is a true medical need. My allergies (red eyes specifically) have been going on for years; finally broke down and tried something (doctors advice). This drug felt like poision in my body. F 35 5 days
10 MG 1X D
9/6/2013

 1  Severe allergies, hives I moved to an area where I suddenly developed terrible seasonal allergies to trees, weeds, grass, and mold. It felt like I had a cold all the time with stuffy nose, itchy eyes and eyes, runny nose attacks, and hives. Then it became a food allergy where I had an itchy throat after eating fresh cantelope and carrots. So I started taking one zyrtec d in the morning and one zyrtec at night. And it was amazing how well it worked. All of the symptoms went away and I felt normal. But over the years my body has changed and I am finally realizing that this is all from the zyrtec. I developed dermatitis that no dermatologist could explain. As a woman this was devastating because my skin was rough, dry, and itchy. So I figured I was reacting to make up with my allergies. Then I developed acid reflux, and my joints ache and pop. I only pee 3 times a day and I just feel sluggish and have a hard time sleeping. So I even did a sleep study and got a cpap machine that didn't work! So i slowly ran out of pills and was in the midst of moving and didn't have time to get more. I decided to try not taking them and I've noticed a HUGE difference. My skin is normalizing, I'm peeing 7-8 a day, my joints feel better. I am getting out of the itchy phase but it wasn't terrible since I was itchy when I was on zyrtec. And I have had crazy vivid nightmares and trouble sleeping. Hopefully it goes away soon. On a side note, I even took doxycyclene to help with my skin and during a beach trip it damaged my na F 38 9 years
15
9/1/2013

 1  Terrible side effects over excitement, rage, violent behavior , mood swings, Anxiety, separation anxiety. Racing heart, stomach ache, crying for no reason. After being on Zyrtec we noticed a change in behavior, our 5 yr old became aggressive hitting and screaming crying over little things, It was thought at first he was just acting out. The next day after each out burst he was back to his normal docile self. After taking the drug he again became extremely agitated and violent. Stated didn't care if he lived or not. His behavior was extremely disturbing to us . I have experience in dealing with adults with mental health issues and have never encountered an adult with this much anger and rage. Taking him off this drug Today after reading more post we aren't alone in this belief that Zyrtec is the problem. M 5 6 months
5 ml prn 1X D
8/31/2013

 1  Allergies I was taking the All Day Allergy relief from the $ store and it helped with itching, however I was having suicidal thoughts and since reading all these comments I come to realize its the Zyrtec! I even went to a therapist! Then I went on Claritin D and the D is for DEPRESSION!...I am so glad I found this website through WEB MD... I was taking it to sleep at night but couldn't get up in the morning and when I did I was a zombie! My doctor gave me NATURAL D-HIST by Ortho Molecular Products and its also non drowsy...try it...I am on it now and feeling much better...also 1,000 Vitamin C a day can stop the running nose...natural is best. F 59 6 months
10 1X D
8/31/2013
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 1  allergies had the bloating and weight gain, then had a emotional meltdown today....no more zyrtec for me F 42 2 weeks
120 1X D
8/22/2013
Email
 5  severe eczema none. claritan didn't work and benedryl made me too sleepy. it helped with severe intense itching, pruitis and fissures in skin. my Son had the same from 3 months old (3/4 tsp once a day) and it was a God send due to severe food and environmental allergies. no personality changes or visible side effects and so my kids have taken it. I will note I am extremely sensitive to medication and side effects. many effective medications for others, have extremely negative side effects for me. the reaction my be biochemical and genetic in nature. F 34 3 years
20 1X D
8/12/2013
Email
 1  Sinus allergies Extreme dry mouth 3 minutes after taking, dizziness, sever onset of anxiety. Weak as if I had the flu. Severe stomach bloating and gas. Headache It may work for some but never, ever again for me. I was a basket case. Had to pull into a parking lot and compose myself. Severe anxiety came over me and I felt I needed to go to the emergency room most of the day. I got home and immediately fell asleep for 3 hours. I woke up so weak that I couldn't hardly get up. I wasn't sure if it was the Zyrtec or that I was really ill. The anxiety had my mind thinking very bad thoughts of Impending doom. Beware if you take this. If you've ever experienced anxiety, I wouldn't even consider it ever!!! M 45 2 days
Low 1X D
8/9/2013
Email
 1  seasonal allergies vertigo and itchy skin F 58 1 weeks
10 MG 1X D
8/6/2013

 1  Seasonal allergies 2 year old daughter started stuttering, having adverse behavior, and became very emotional...a completely different child than before she started taking it. I would NOT recommend this medicine as it made my child a completely different person! F 2 5 months
5 ml 1X D
7/29/2013

 1  Seasonal allergies Horrible horrible withdrawl symptom!!!!! BEWARE!!!! Took for three months with great success and no side effects BUT once the seasonal allergies were over I stopped taking Zyrtec. Day 7 with THE MOST INTENSE itching hives ALL over my body!!! NO WAY TO RELIEVE WITHOUT TAKING ZYRTEC FOR THE REST OF MY LIFE!! Google itching withdrawl from Zyrtec and you will be SHOCKED at how this can be a life altering symptom!!!!! THE LONGER YOU TAKE THE LONGER YOU WILL SUFFER WHEN STOPPING!!!! F 43 3 months
7/13/2013
Email
 1  My 18 month old has been on it My son has been on it for two days and is hyper at night and cries all night in his sleep and is clingy and emotional all day! I am stopping this med NOW M 1 1 days
7/9/2013
Email
 1  allergies stomach pain, weight gain, headaches, deterioration of vision, mood swings, digestion problems, rash, body aches, brain fog, memory loss I took zyrtec for about 2 years almost every day. I recently stopped taking it due to the realization that I didn't need allergy medicine year round and its a financial burden. I have never experienced withdrawal symptoms from a drug in my life, but on day 3 of no zyrtec I experienced hell. I had unbearable itching all over my body, from my fingertips to my scalp, to my eyelids, and the inside of my toes. You name it, it itched. The itching was so bad I made myself bleed from scratching. Then the nausea hit. I could only keep down a few bites of food and that's it. I started having blurred vision which led to vertigo. I am currently on day 5 of no zyrtec and the itching is still severe. The only thing I want to do is get zyrtec off the market. I went to the doctor to see if there was anything to do for the discomfort, and he told me to begin taking zyrtec again. No one believes that an allergy med can have withdrawal symptoms, but thank God for forums like this. I don't feel like I'm crazy anymore. This product needs to be taken off the market! F 28 2 years
10 mg 1X D
6/27/2013

 1  allergies fatigue, body aches, severe stomach aches, headaches, extreme anger, depression My son started taking this at 26 months for 8 years. At the time, there was very little information about this drug on the internet. At every DR apt I inquired about side effects and every DR would always tell me they haven't heard of any negative long term ones. Well, if you or your child is taking this "poison" get off of it immediately. It will turn you into a devil. There is not enough time or space to describe the details, but my son would "zone" out and become extremely violent trying to harm himself and us. Fortunately, he was young and small enough for us to control. After 48 hours off this poison, he was a different person. He has been off this for 4 years and over time he hasn't had any meltdowns or anger problems. If you have a child taking this now and can't control their anger, stop giving it to them immediately. They might itch for a week or 2 but that can be controlled with Benedryl until the zyrtec is out of their system. Zyrtec should be banned. It is a horrible medicine. M 15 8 years
1X D
6/14/2013

 1  Allergies Daily headaches, restlessness at night, heart palpitations I couldn't understand the reason for my headaches (which I never get) and heart palpitations. It finally clicked that I just haven't felt like myself since I started taking this medication. Which did NOTHING at all to help my allergies. I stopped taking it and it's been three days off of it and I'm feeling back to my old self again. I will never take that crap again! F 42 1 months
10 1X D
6/10/2013
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 2  Itchy ears,throat,runny nose,sneezi I took just under 1tsp of the children's liquid at 9:30 last night. Within five minutes of taking this, I noticed a little bit of dizziness. My arms and legs felt like lead, and I started to be extremely tired. I felt some loss of coordination as well, ended up dropping things,etc. The worst symptom was feeling anxious, and not being able to really catch my breath. I am not normally an anxious person, nor one who writes reviews, but just wanted others to be aware. I felt slightly better after 2 hours, and able to breathe a little easier, but I still feel tired and slightly uncoordinated today 17 hours into it. I have been giving this to my five year old for a while now. I hope he doesn't feel like I did! I usually only give him half a dose(1/4 tsp or 1.25 mg). It does work well against his allergies, but I will definitely be more cautious now! I didn't know anything about the emotional aspects until finding this site, so I will watch for those. As far as I am concerned, I will never take a full dose again. If I ever try it again, it will be at half the recommended dosage. Even at that, I don't know if I will ever dare try it again. It was a pretty strong reaction! I was really wanting it to work out for me too because it worked really well against the runny nose, sneezing and itchy ears and throat. F 44 1 days
5mg 1X D
6/6/2013

 3  Seasonal Allergies, Ragweed, Polen Depression, Mood Swings. Zyrtec handled my allergy symptoms pretty well. Unfortunately I was as crazy as a loon while taking it. M 35 20 days
10 MG 1X D
6/5/2013

 3  Sinus infection from allergies Atypical irritability M 53 10 days
10 mg
6/5/2013

 3  Allergies Even though the package says non-drowsy it still makes me super tired, I take it at night and it helps me sleep better but when I wake up I'm still tired! I feel like no one wants to be around me and I get random bursts of dizziness. It makes my knees ache more than they usually do too. It works great for allergies but the side effects are horrible. F 15 2 weeks
10mg
5/31/2013

 1  Allergies Anxiety, depression, rage, dark thoughts, insecurity I which I could give a negative rating for ZYRTEC. Zyrtec turned my daughter into a different child. Over the past three months she has changed from a typical 11 year old (with occasional drama but always good natured, kind and reasonable) into a girl that has intense irrational meltdowns several times a day. I am very sad to say that we initial brushed her behavior off as typical preteen drama but the intensity of her outburst made me believe that something else was going on with her. I finally made the connection this morning and began researching the side effects. I called my child's doctor and sadly they have never heard of any side effects like this from Zyrtec - wow- so scary! I encourage anyone who has had side-effects to log them here. I usually do not do this, but I am so scared for the kids that are taking this drug. If parents do not make the link between ZYRTEC and behavior these children could easily and unnecessarily get diagnosed with a mental health condition. F 11 3 months
1X D
5/31/2013

 1  Seasonal allergies Fatigue, sudden anxiety, depression, paranoia F 33 7 days
5/28/2013

 2  Allergies Moodiness , drowsy , weight gain F 69 1 years
30
5/27/2013

 1  Seasonal allergies Tired, lack of energy, weight gain, exhaustion, spacey, jello brain, can't focus, irritable, no motivation, muscle weakness, muscle aches, headaches, nightmare F 27 2 months
1xD night
5/24/2013

 5  sinusitis from allergies relaxes me when I take it at night Zyrtec is the only allergy medicine I have taken that actually works and does not give me bad side effects. When I take it daily it keeps my sinuses clear, and I no longer have itchy watery eyes and ears. Without Zyrtec, I cannot breathe through my nose. This medicine has greatly improved my enjoyment of life and I am so glad it does not give me any bad side effects! F 52 6 years
10mg 1X D
5/20/2013

 3  Seasonal allergies Fatigue, lethargy, increased hunger, weight gain, feelings of nausea several hours after taking it, irregular sleep. While Zyrtec does a great job controlling my seasonal allergies it comes at a high price. I find it hard to believe that only 2% of Zyrtec users are affected by weight gain. Seems like a tons of complaints about it. I've always been a 3 meals a day person but since I started taking this I'm hungry all the time and my stomach is growling between meals. I take it around 8:00 at night so that I can sleep off the drowsy side affects, but they still linger through the next day. I've also encountered some waves of nausea 7-8 hours after taking it (and yes I take it with food). Adding Zyrtec is the only change I've made to my routine so I can't attribute these problems to anything else. F 44 3 weeks
10 mg 1X D
5/9/2013

 1  seasonal allergies Facial tic (eye squinting/blinking) My 9-year old son developed a facial tic immediately after starting zyrtec. One eye was squinting/blinking non-stop, every few seconds all day. At first, we thought it was a coincidence...but it started again when we tried to reintroduce it. His pediatrician said it's not uncommon. M 9 4 days
7.5 mg 1X D
5/3/2013
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 1  Hayfever, season allergies I have never taken allergy medicine but this season my allergies seemed worse. I do not have any nasal congestion, but terrible itchy eyes and nose. I took this for a few days and noticed that I was irritable, very drowsy, lethargic and it did not change my hayfever symptoms at all. In fact my nose burned and my eyes itched worse than ever. I am extremely sensitive to medication of any kind. One benedryl will knock me out for a day. Everyone is different. My husband takes zyrtec with no side effects. My advice if you are someone who struggles with anxiety or tends to be very sensitive to medication, do not take this. I have been off of it for a few days and feel back to myself again. I am thankful that I realized what was causing these changes in me before I took it long enough to experience worse side effects. I would not recommend this to anyone who is similar to me in sensitivity to medicine. F 31 1 months
1xday
5/1/2013

 1  Allergies With Zyrtec, you fall into a deep sleep that is extremely difficult to wake from, so much so that I actually almost wet the bed! Also, I have been in a bit of a mental fog for most of the time. When I am not in a fog, I am getting irritated, easily, for no real reason.... F 3 days
10 mg 1X D
4/29/2013
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 1  seasonal allergies This is actually a rating for my 2 year old daughter's experience. Her doctor recommend OTC childrens zyrtec for slight seasonal allergies. We thought she had suddenly and aggressively started with the terrible two's. She was having constant meltdowns over the tiniest things, hitting constantly, and just being downright malicious. Finally I happened to mention to my sister that my child was on Zyrtec and she told me to take her off it. Turns out my sister gets the same side effects on this drug and since then I have met many people who say that they have had the same experience. My daughter reverted back to her happy-go-lucky, joy to be around self in a matter of a few days. She will NEVER take this medication again. I have started to notice some of these side affects in myself when i started to take Zyrtec this year. I am switching to claritin or allegra. F 2 3 weeks
1 pill 1X D
4/26/2013

 2  Allergic rhinitis The first day I took Zyrtec, I did not feel any effects, good or bad. The second day, I woke up without a sore throat, but I could barely move. I slept the day away and had muscle and joint pain, similar to the flu. I would not recommend this to anyone. F 27 2 days
10 mg
4/20/2013

 1  Seasonal allergies This medicine makes me extremely tired like a ZOMBIE!! Its horrible! I am not motivated and sometimes down and depressed when taking this!! I am no longer taking this it is HORRIBLE! F 32 10 days
10mg
4/13/2013

 3  hives Extremely increased anxiety, difficulty falling asleep, difficulty waking up. However, it leaves me functioning enough to go to classes, which Benedryl did not. I am on double the over the counter dose due to the severity of my allergic reaction F 20 4 weeks
10 MG 2X D
4/8/2013

 2  Hives, dermatographia Extreme lethargy. Foggy brain. Mood swings. Spacey. F 44 2 years
4/7/2013

 3  Allergies Dry skin, dry mouth, irritability, anxiety, lack of motivation. Works really well on allergies. But I can't stand the loss off attention, dry mouth, anxiety. M 22 15 years
10mg 1X D
4/3/2013

 1  seasonal allergies dry mouth, sore throat, EXTREME irritability I have suffered my whole life with seasonal allergies. I have tried many otc allergy medicines. Most do nothing but make me sleepy. Upon trying this medicine, I thought I finally found the one! I have had no allergy problems at all. Unfortunately, it did make me extremely thirsty and give me a sore throat. Those are side effects I could deal with. However, I noticed that I was not my normal cheerful self. I am a very happy person, but today, I was so negative about everything. The only change was the medicine. Everything made me so mad, even the littlest things. I teach elementary school and feel so bad about the way I treated my students today. I snapped at them for every little thing, even things they could not control. I will NEVER take this medicine again. I would rather go through months of being drowsy from Benadryl than dealing with these side effects. F 38 1 days
10 1X D
4/2/2013

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