Drug Ratings for ZYRTEC

Average Rating: 2.1 (1577 Ratings)

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Key to Ratings: 1=LOW (I would not recommend taking this medicine.)
5=HIGH (this medicine cured me or helped me a great deal.)   

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    Charts & graphs: Reviews Summary for ZYRTEC  | Top 10 Adverse Effects (reported to FDA)

RATING  REASONSIDE EFFECTS FOR ZYRTECCOMMENTSSEXAGEDURATION/
DOSAGE
DATE ADDED
sort down sort up F  M  
 3  ALLERGIES gained 30 pounds(can't get the weight off no matter how much I work out), very tired all day, trouble sleeping, weird dreams, more hungry late evening/night helped my allergies, but now that I have read about the awful side affects and realize my unusual weight gain is probably from the zyrtec, I am going to quit taking it and see if all of my exercising and diet will finally start showing results F 33 8 months
1X D
11/7/2014

 4  congestion Restlessness ,tossing and turning at night,waking up very often ,depressed I will not ever take this stuff again F 38 7 days
5 - 120
11/5/2014

 1  Allergies Doctor sais this will really help you. Ummm, NO! Felt like I was high! Took this stuff before bed. Woke up and could barely get out of my bed. Felt completely out of it like I was floating. Sat on the couch and my partner asked if I was okay. I yelled at him! That is so not me... It took almost all day for me to get off the couch. It has been 15 hours since I took this and it is just now barely starting to wear off. Be very careful if you decide to take this stuff, I guarantee you I never will again, it's not worth it. M 51 1 days
10mg 1X D
10/26/2014

 1  Seasonal Allergies Started Zyrec for seasonal allergies. The third day, my allergy symptoms were better. I was home alone, and stood up. Could not stand, as my legs and arms were heavy and the room was spinning. Terrified, I ran outside, so that a neighbor might see me and help. No neighbor around. I sat down, until it stopped, and stood up. Started again. Fortunately there is an emergency clinic about two minutes from my house. I hopped in the car, said a prayer, and drove there. They thought I was having a heart attack. Did an EKG. Nothing wrong. It was the stupid medication. Stopped it, and it took a couple of days before I felt myself again. Allergies returned, but I will deal with them naturally, as I cannot afford the medical bills that using Zyrtec, for only THREE days, cost me. DO NOT USE THIS DRUG. IT'S DANGEROUS. Should be taken off of the market. F 59 3 days
1X D
10/9/2014

 1  Allergies I recently moved to Texas and have been dealing with allergies for the first time in my life. I took half a zyrtec in the morning 2 days ago and FAINTED later in the day. It was terrifying but luckily someone caught me before I could hit my head on the concrete. I looked on the FDA site and read that 1.6% of users experience fainting as a side effect. F 27 1 days
15mg
10/6/2014
Email
 2  seasonal allergy rage, anger, anxiety, panic attacks, headache, dizziness F 45 7 days
10 mg 1X D
10/5/2014
Email
 1  Severe allergies: pets & seasonal Shortness of breath. Irregular heartbeat. Anxiety. Depression. Insomnia. Lack of focus. Drowsy. This helped with my allergy symptoms, but the side effects are not worth it. I felt like I was having a heart attack or asthm attack at times. Very scary. Beware of Zyrtec! F 23 7 months
10
9/23/2014

 1  Seasonal allergies I stopped taking cetirizine 5 days ago, the first night was horrible, itch all over my body, I took one pill of allegra 180 mg and all the symptoms were one, I kept having 1 pill of allegra for the next 3 days but I want to stop it today, I am itching but not so bad now, I'll see what happen when I stop taking allegra. I guess I can not take any medication at all, every time I take one I get so many symptoms that are way worse than the reason I am taking it. Anxiety, panic attacks, social phobia, and I also lost my hair, I feel like I have aged 10 years since I started this medication. Too bad I did not make the connection before. F 47 1 years
10 MG 1X D
9/12/2014

 1  sinus I haven't started taking mines yet and just hearing these comments, I don't think I want to take it now. Now my question is, is your zyrtec you're taking regular zyrtec or zyrtec D? F 42 1 days
10mg
9/9/2014
Email
 5  Rhinitis Helped me with dry itchy eyes. And constant rhinitis. No side effects that I'm aware of. My right ear always had fluid in it during allergy season which makes me more susceptible to cold and flu viruses Zyrtec helps keep inflation to a minimum. F 50 10 years
10 Mg
9/8/2014
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 1  Allergies Helped the first day. However the second day... HORRIBLE rapid, uneven heartbeat, random panic attacks before falling asleep (seemed to have zero control over), anxiety, jumpyness, restlessness. I honestly got no sleep at all the second night, and I am a college student so the next day was awful as well. Like the woman above said, I HONESTLY THOUGHT I WAS DYING. Doooo NOT take this! F 19 2 days
9/3/2014
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 1  Allergies Horrible arrhythmia, short of breath, sea legs, foggy brain, lost sense of taste, dizzy, super lethargic, intense & dreadful panic attacks. I honestly thought I was dying. Thank God I ran into this site and read many with some of these effects! Have been off of it now 2 weeks and all symptoms are gone! Back to Benadryl! F 49 2 months
10 mg
8/27/2014

 3  Bug bite weakness, fatigue, depression, anger I took 1 10mg Zyrtec gelcap two days in a row to reduce the swelling of a baseball-sized bug bite on my leg. I took each dose before bed, and the swelling was greatly reduced by the morning. I was feeling more tired than usual during the day, but I was out of town for work and chalked it up to travel exhaustion. I took one again last night (two days after the second dose) and felt extremely combative with my boyfriend and had trouble falling asleep and staying asleep. This morning I still felt angry and was having lots of doom and gloom thoughts. The anger transitioned into depression and feeling physically like I had been run over by a steamroller. I wondered if I had caught the flu. I took a 2-hour nap and when I woke up, I could hardly move my body. Am feeling a bit better, although still a little off, almost 24 hours after the last dose. I'm disappointed because Benadryl tends to cause rapid heart beat and anxiety attacks for me, and I thought Zyrtec could be my go-to. F 27 3 days
10 MG 1X D
8/15/2014

 1  Seasonal Allergies Intense rage, anger, and mood changes. Started taking Zyrtec in May to combat seasonal allergies. Last year was extremely bad for me, so I wanted to get a head start on anything that would stop me from being miserable. After a few months of taking Zyrtec I started getting uncontrollable rage and anger when mildly arguing or confronted by friends, family, and co-workers. The rage and anger was so intense, it even scared me. During an argument/fight, I would seriously want to physically hurt the person I was fighting with, something that I have never truly felt. I sincerely thought I was losing my mind and going crazy. I've never felt that kind of anger. I went to my doctor and explained what was going on - I assumed it was hormonal and connected to my periods - it HAD to be! Next I was referred to a psychotherapist for changes in mood. Was told it was the stress at my job, anxiety, etc. When my allergies never really came about this season, I realized I should just stop taking Zyrtec - what's the point if I'm not sneezing/miserable? So, I stopped taking Zyrtec for about two weeks. Then I took Zyrtec randomly one evening after sneezing all day and the next day I was a crazy, psychotic, rage monster. It was then that I finally realized the correlation between the drug and my mood. I have been off Zyrtec for about one month. All rage/anger/mood change symptoms are gone. This drug should NOT be OTC. It took away two months of my life and made me feel beyond crazy. I never even considered that allergy medication could e F 33 3 months
10mg 1X D
8/13/2014

 5  cold. Not only did it help my cold symptoms but it also helped my depression by making me emotionally numb. F 29 3 days
8/4/2014

 1  seasonal allergies My son is unable to take ANY of the 24 hour allergy medications...he becomes enraged, physically aggressive, tantrums, runs away from school...my very sweet boy turns into a demonic entity...we have tried Zyrtec, Allegra, Claritin, and their generics all have turned him into the most impossible child. We tried the OTC nasal steroids this spring...what an amazing difference...he was back to his normal boy behaviors!!! M 7 10 days
10mg
8/2/2014
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 2  seasonal allergies Tachycardia, palpitations, variable vision, vivid dreams Although Zyrtec relieved my allergy symptoms, I cannot tolerate the side effects. Thought I was developing heart disease until I started thinking my symptoms might be related to Zyrtec. An online search confirmed my suspicions. F 54 60 days
1X D
7/31/2014

 1  Seasonal Allegries- children's dose dramatic behavior changes, tantrums and rage, inability to focus We started seeking drastic medical care, blood tests and therapists for the rapid change in our child. Unfortunately it took us almost a month to correlate the possibility. Within 4 days of stopping the medication, she was herself. I am not saying that this is a "bad" drug, but warnings should be given, especially with an OTC medication. And based on the numerous accounts, I am one of the many parents that have suffered through this. F 6 4 weeks
10 1X D
7/19/2014

 1  Congestion Horrid. Wild dreams and this is the next day and I can not wake up enough to get out of bed. Mind altering. F 62 1 days
10mg 1X D
7/5/2014

 1  Seasonal allergies Horrible nightmares. Anxiety. Panic. Affected brain/thoughts. Colic/constipation/diarrhea - yes, turned GI upside down. Vision got worse, haven't recovered. M 53 2 weeks
10 mg 1X D
7/1/2014

 1  Allergies My 11 year old son's usually agreeable personality dramatically changed. He slept until 8:30 am when he always gets up around 7am and then proceeded to yell and be disagreeable all day long. He even called me names he has never dared use before! When I read about the medication and realized it might be a factor talked to him about why he was behaving the way he was. He apologized and said the medication made him feel "out of control" when he got angry. Unbelievable that a pediatrician had prescribed this for mild allergy symptoms! I hate to think of all the children out there who are taking this - this should be taken off the market in my opinion. M 11 1 days
1X D
6/27/2014

 1  seasonal allergies My 2.5 year-old son started behaving very abnormal after 2 days on it. Very irritable, cranky, crying with no reason, hitting his head on the floor, hitting us....completely the opposite of what he normally is. I can't believe our pediatrician recommended this. M 2.5 3 days
5 mg 1X D
6/25/2014

 1  Seasonal allergies tree pollen Depression, easily agitated, angry for no reason, tired all all the time, hair loss. I started taking this 6 years ago for 4 months out of each year for pollen allergies. Each year I realized in the spring and early summer I would become a mean angry depressed person who didn't feel like doing anything. My hair also falls out a lot. Also each time I stop taking it I have intense itchy skin and scalp for 2 weeks or so afterwards but my mind clears up and I feel better mentally but the physical withdraws are terrible also I cannot sleep at night once I stop taking it. I will never take it again I cannot deal with the mental symtoms from it anymore it effects me and the people around me. It worked great for my Sneezing and itchy eyes but the side effects and withdraw are not worth it anymore. F 25 6 years
10mg
6/15/2014

 2  Dust mites, animal dander Serious behavior issues. 8 year old daughter was prescribed singulair first and we went off that because of extreme mood swings. Tried zyrtec next, it wasn't as bad as the singulair so we continued it. Issues at home started increasing, lots of crying, anxiety, and physical anger issues. Her reaction to everything was so extreme. 3 months after starting zyrtec, her report card came home. Where she normally had +'s in behavior, she had -'s now! Teacher commented about her being distracted and not getting work done. Extremely unusual for her. I believe it worked well for allergies, not sure as it may have been the work we did in the house to try to minimize dust and dander. Am planning to cut her dosage in half and see if it helps. F 8 3 months
10 MG 1X D
6/13/2014
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 1  Allergies. Dust mites and dust spec I almost never believe people when they say they have weird side effects. I took this for a year. Thought it was causing me to gain weight(I don't think so really) so I decided to stop taking this. I kept waking up in the middle of the night and eating! That may have been the Zyrtec. Then when I ran out and was literally scrounging around in my car at 1 am since I couldn't sleep without Zyrtec my husband joked. " I think you are addicted to Zyrtec". I barely drink and take no other meds! So I stopped. WOW. The itchiness was so unbearable. I thought I had lice(no) then bedbugs(no). A late night internet search revealed other crazies like me. STILL not a believer I started Zyrtec again when I moved into a dusty house with no AC and windows open... I took it for about a week 5-10mg a night. 2 nights ago I stopped. I just washed my sheets because I was convinced AGAIN I had lice. I have welts on my back this time. I itch ALL over and feel like there are bugs crawling all over me at night! I am so mad!!!! F 43 1 years
10mg
6/9/2014

 1  Dust mite allergy/allergic rhinitus The allergy doctor prescribed Zyrtec for my 4 yr old son to help alleviate the symptoms leading to his wheezing cough/respiratory conditions. Pretty soon I noticed that our normally easy-going, sweet boy turned aggressive, and completely over-reacted to things which frustrated him. His heart seemed to be racing faster than normal also. I realised this started the first day he was on Zyrtec. This one has been tipped down the sink! I'll be looking for more natural alternatives. Should have known better than to trust a pharmaceutical drug! M 4 5 days
2.5mls 1X D
6/7/2014

 1  Seasonal allergies Anxiety, racing thoughts, head pressure, inability to focus, quickened heart rate. Originally I thought it was my morning coffee that gave me these symptoms, but I've drank two cups every morning for many years. I found that I had an extremely hard time studying school material, retaining information and just feeling at ease. I noticed I would feel better in the late evening which makes sense as the drug would be in my blood to a lesser degree. I take no other medications and have never experienced these effects on other allergy mess. I'll take my mild allergy symptoms any day. Never again will I take Zyrtec! M 25 2 days
10mg
6/6/2014

 1  animal allergies chronic fatigue, weakness, confusion, anxiety, depression, horrible withdrawal I work with animals and became sensitized to them. Upon recommendation by the veterinarian with whom I work, I started taking Zyrtec. After 2 days, I was so tired and weak, I could barely move. I couldn't remember what day it was, felt anxious one minute and severely depressed the next. I continued taking it thinking/hoping the side effects were temporary. After 2 weeks of hell, I stopped taking it, and now I am experiencing painful, all-over itching so badly, that it is nearly driving me crazy. I will get through this. What I can't understand is why this medication is OTC, let alone why it was ever prescribed for human consumption. F 53 14 days
10 mg 1X D
5/24/2014

 1  Sinus problem Chills, dizzy, tired, evil DON'T TAKE M 65 2 days
20 1X D
5/22/2014

 1  Seasonal allergys Irregular heart beat. Either PAC's or PVC's. Terrible shaking. Vision problems. I quit taking it and the shakes and irregular heart problems went way. My vision has not returned to normal and it's been a few months Are there any class action suits againt the makers of this terrible drug. I'm an RN and I can't believe Zyrtec is allowed to stay on the market M 56 10 days
1X D
5/21/2014

 1  Allergies Thought this medicine was a God send until the second day when I could no longer urinate beyond a dribble at a time. That scared me because I drink up to 11 glasses of water a day. My urethra and bladder have been hurting since I began taking this.I decided to look up the side effects and lo and behold painful urination is a side effect. I took my last pill the night before and today I am up and walking around, I had previously lain in bed for 5 days in agony after the doctor told me there's nothing wrong. I'd also like to know if these urinary problems are reversible? Be VERY careful with this medicine. F 36 8 days
10mg
5/15/2014
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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
Email
 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

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