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Drug Ratings for SINGULAIR

Average Rating: 2.1 (1124 Ratings)

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

RATING  REASONSIDE EFFECTS FOR SINGULAIRCOMMENTSSEXAGEDURATION/
DOSAGE
DATE ADDED
sort down sort up F  M  
 3  Allergies and asthma Oddly, my son has episodes of night terrors as well. I never thought of it possibly being related to the singulair until reading the other posts! M 9 10 days
30 mg
4/22/2014
Email
 1  Asthma I definitely urge parents not to take this medicine. My daughter is 3 years old and was given this occasionally when she had asthma. Maybe like 3 times year, for a short duration of 4 days. Recently, the doctor gave her this again for 4 days. Today is the 5th day that she has withdrawn from the medicine yet it has changed her personality completely. She has become aggressive and screams that she wants to throw out her favourite teddy bear in the garbage. It's scary. As you can see no kid in the right state of mind would ever suggest this. She was not joking, she was serious about it. My worst experience are the night terrors. At first she will kick and scream about opening the door for 10 minutes, now her episodes last for 30 minutes. It is very frightening to watch. I don't know when the side effects will wear off. I miss having a sweet and happy kid. F 3 4 days
4mg
4/10/2014

 1  seasonal allergies, rhinitis anxiety, depression, insomnia, isolation, panic attacks, She did take this for two years with no issues but once put back on it a year later things took a scary turn. I am posting this on behalf of my then 10 year old daughter who began taking Singulair (brand) at about age 7 until age 9 and then put her back on it at age 10 for about 16 days. After about three weeks, my daughter came home a completely different person. It was as if a light switch had gone on or off. She had anxiety at a level I've never experienced, panic attacks, feelings of throat tightening which I believe was a byproduct of the anxiety. Since, this was so sudden and not gradual I had to ask myself what had changed. I realized that she had just began taking the generic Singulair and stopped immediately and took her to the pediatrician for confirmation that it was the right thing to do (honestly, I would have done it with or without the doctors permission) This occurred on June 13, 2013 and within about 3 weeks we saw marked improvement and also had began seeing a counselor and doing a LOT of cognitive behavior therapy on a minute by minute basis. This was a happy go lucky, goofy, playful, funny, smart, outgoing child that retreated to her room and was in a panic when I was not near here. I literally slept in her room for 2 weeks. She would cry for no reason and stopped eating - lost about 7 pounds. It was quite possibly the most frightening time in my life and obviously hers. She has rebounded well but I do see some residual effects quite possibly because of the memory of how she felt. I would NEVER recommend taking this medication and especially not fo F 10 2 years
5mg 1X D
4/2/2014
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 1  asthma mental tics, depression, anxiety, high blood pressure, stomach pain, back pain, itching, inability to focus, insomnia, headaches, diarrhea, obsessions Within days of stopping the montelukast, my negative side effects began to rapidly go away. M 22 10 months
10 1X D
3/26/2014

 2  Asthma & mast cell activation disor Ear pain, upper back & chest pain (quite strong), sour stomache, sneezing fits, itchiness. F 49 4 days
10 mg
3/25/2014
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 2  allergies The worst insomnia imaginable(it's 5:01 as I write this and I've been trying to sleep since 10:30p), and a fatigue headache to match. Pretty much unbearable. Have noticed slight reduction in allergies but not enough to rival the sleep loss. Oh well. Might also mention I am taking the generic form of the drug. F 21 6 months
10mg
3/24/2014

 1  recurrent chest infections My 2y old son went from being normal 2yr old with the usual moods to a child with no interest in playing, aggressive `I'm cross and angry`, 3hr tantrums. He was like a different child.He no longer needed steroids but did still need ventolin. We got to a point when we couldn't cope and stopped montelukast. Within 3 days our happy playful little boy was back - singing and not being cross. Now is a normal 2yr old having tantrums still but 10mins not 3hrs. He's not going back on it. We felt awful for having put him through it. He couldn't express what was wrong so we don't know if it was psychological or physical. M 2 6 weeks
3/10/2014

 1  Asthma Non stop headaches, feeling faint, suicidal thoughts and a little itching Doctor though i had asthma so i was perscribed Montelkulast ( singulair) i have chronic phlegm that i have had for 2 years and i have bad panic attacks... im 17 and on the 3rd day i experience itching and a non stop headache that hasnt left since... my suicidal thoughts have included jumping out of the window or over dosing on medication.. I wont commit suicide or want to at all so i find it weird to have such dark thoughts... M 17 4 days
2 x 5mg 2X D
3/9/2014
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 1  Acute rhinitis Depression, thoughts about death, anxiety, sweats, heart pounding to just name a few! I know it is this drug as I didn't have ANY of these symptoms before I took that one pill. I am so glad I found this site. I thought I was loosing my mind. I will never take it again. F 44 1 days
3/9/2014

 3  Severe Allergies I never had any side effects while taking Singulair but since CVS/Caremark changed to the generic brand Montelukast, I have had many symptoms. Depression, suicidal thoughts, mood swings, anxiety which I have never had in my life, crying, night sweats, dizziness, frustration, trouble concentrating and numbness. I thought the symptoms were due to me being pre menopause but my suicidal thoughts are so bad I think it may be from the generic brand. I stopped taking it last night and I'm going to see what happens. I'm nervous about my allergies now because Singulair helped me for years, but I can't put my family through these mood swings anymore. F 47 5 years
10mg 1X D
3/8/2014
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 2  Allergies/chronic sinusitis After hearing from friends this drug did wonders for allergies, I decided to consult with my dr and began taking singulair. The first few days I noticed runny nose (which wasn't a usual symptom and sore throat). I have ulcerative colitis and receive remicade immune suppressing infusion every 8 weeks. Since having an immune disease and chronic sisusitus I wasn't surprised by the immediate onset of a sinus cold, but noticed the unusual runny nose. Shortly after I felt much better. Then I soon realized I had mistakenly left singulair out of my pill container upon refilling....i didn't notice until 5 or so missed doses. So I went back on it thinking it was unrelated and the symptoms immediately returned and worsened. I've noticed insomnia is also an issue (it is 2:30 am as I write this). My throat pain is immense and head hurts soooo bad and now it seems I have the onset of an ear infection. Not happy and stopped taking this drug 2 nights ago. I also noticed some red itchy blotches early today. Not fun. Would definitely not recommend it to anyone with non related heath issues. Thankfully no signs of depression. F 38 1 weeks
1
3/8/2014

 2  Asthma Nightmares/ night terrors, insomnia, depression, anxiety, irritability, suicidal thoughts, cramps, tremors, dry mouth, sore throat, headache, It did do wonders for my asthma, so I stopped and restarted it several times. When I stopped, the side effects went away, but returned as soon as I restarted. F 44 1 years
10mg 1X D
2/12/2014

 5  Asthma/Allergies None Completely unblocked my nose so I could breathe again. Asthma issues were gone, never had to use rescue inhaler. Helped tremendously with allergy issues. F 25 1 years
10MG 1X D
1/18/2014

 1  Allergies/Asthma I'm a sound sleeper ordinarily, and I had horrible violent night terrors that would jolt me out of bed. My doctor suggested adjusting the time of the day that I was taking it, and it didn't help. I came across these pills last night and decided to try one, not remembering if this was the medicine that caused the nightmares (I've tried a lot of different asthma meds), and I had night terrors once again. I could see the bad dreams leading to poor sleep habits and fatigue. And I see on this site folks talking about tingling hands and feet; that's indicative of hyperventilation from anxiety. I'm not taking this anymore. We have a drop box for unused prescription meds here in my town, and that's where this bottle is headed. F 38 2 weeks
10 MG
1/2/2014

 1  allergies My 4 year old daughter took this medicine. Sleeplessness, nightmares, complaining of monsters in her bedroom, extreme anxiety, mood swings, glazed disconnected look in her eyes at times, anger, aggression, destructiveness. It was like she was possessed. She's been off this for two months. The symptoms have almost all disappeared. This drug needs to be banned. These dangerous side effects are ruining children and families. This was the only drug my daughter was on. She had no control over her behavior and was diagnosed as having a mood disorder. She was put on antipsychotic medicine at the age of 4! I stopped those medicines shortly after I stopped the Singulair. The behaviors have almost all disappeared. F 49 11 months
4 mg 1X D
12/10/2013

 2  Allergies Did give me some relief with the internal swelling in my head and chest. Until the muscular cramping started. M 41 5 days
30 1X D
12/3/2013

 4  astma chronic coughing He has less coughing, sleepyness, he ha been using it since he was two. Without it it is non stop coughing. M 8 1 days
4mg
11/24/2013

 1  Severe allergies Worked great on allergies from the 1st day Wow I thought great than the ball dropped Severe severe leg and foot and thigh cramps sleep interrupted and nausea Would handle the sleep and the nausea Can NOT handle the cramping F 70 10 days
10
10/26/2013

 3  Asthma Symptoms of allergies and asthma have abated, which is good. However, depression and crying and thoughts of dying or never even being born have come up frequently. This last time has been the most severe and my son will not be taking another dose. Weighing benefits and side effects is up to the individual. A 9 year old is not mentally strong enough to fight depression. M 9 3 months
5mg 1X D
10/7/2013
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 1  Allergies My daughter is 3, after 1 week of taking this, she began bed wetting which she had never done, was seeing people who were not there, woke up screaming from nightmares that she said a man was trying to take her away, and worst of all last night she woke up screaming hysterically and was like this 4 hours, saying get them off spiders and other things were crawling on her and were getting her, she is. Ow scared of the dark, won't sleep. Even all day has said things were crawling on her. Scary to think our next 2 weeks may be like this paranoia schizophrenia episodes. And wonder the lasting mental scars it will leave for such a young child. My daughter has taken Singulair for the last 2 weeks and it has helped her symptoms of allergies greatly, it does not offset the extreme side effects it caused. F 3 2 weeks
4mg 1X D
9/25/2013

 1  Asthma Mood swing, depressed, severe joint pain, tendonitis, irritability, easily angered, crazy dreams, insomona, unable to function at times. F 26 3 years
10
9/24/2013
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 5  rhinitis Sleeplessness and vivid dreams, switched from night to morning dosing and side effects eliminated probably due to peak serum effect occurring during the day instead at night. Allergies well controlled and sleeping much improved due to a reduction of sleep apnea snoring. M 75 60 days
10 mg 1X D
9/12/2013

 1  Asthma Extreme aggression. On behalf of my son. He stopped this drug nearly 2 years ago, but is still very aggressive. Before singulair, there was no aggression at all. He is being checked out for residual damage from singulair. M 8 6 months
5mg 1X D
9/8/2013

 1  Itchy eyelids, skin allergies Within 1 hour of taking 1 pill I became extremely nauseous. It lasted about 2 hours. I was pleased to find this website, but greatly concerned about all the effects others are reporting. I will NOT be taking this drug again. F 45 1 days
1xD
9/5/2013
Email
 4  Asthma Works well for my asthma. Recently switched to the generic. Was fine with Teva generic and now experiencing headaches with the Glenmark generic. Don't know what could be different but I get cluster headaches within an hour of the dosage. Want regular Singulair back. F 28 7 years
10 mg
9/4/2013

 1  Allergies I experienced weight gain, libido loss, depression, anxiety, suicidal thoughts(which I've never had before), apathy, angst, distraction, forgetfulness, hate and anger. It severely messed with my marriage and ability to be a good mother. I became unable to function normally. This is the drug from hell. F 37 3 months
10 mg
8/31/2013
Email
 1  Rhinitis I am in the UK and was given this drugby my allergist. After taking it for 4 weeks, I began to feel very depressed and asked my allergist if I could stop it. She was quite bullying and insisted I stay on it, which I did. The last 5 months have been sheer hell! I needed emergency care from my GP after becoming suicidal (so bad that I was almost institutionalised for my safety), and was also now having varicella spots breaking out on my arms and side. My GP told me to stop the drug IMMEDIATELY! No amount of rhinitis symptom relief is worth the sheer hell I. have been through on this drug! F 44 5 months
10mg
8/19/2013

 1  Allergies/Asthma After 4 days I felt as if I became extremely aggressive, agitated at everything and everyone, verge of losing patience at everyone, for no reason at all. This is not how I behave at all. Scary. Scary. Stay away from this drug. Also had insomnia, and even with a prescription sleeping pill had trouble sleeping, heart racing. awful. This drug is the worse drug I have ever been prescribed. Awful experience. F 44 4 days
10 1X D
8/11/2013
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 5  asthma and nasal congestion None Took the drug for asthma. After taking it for a couple weeks I suddenly noticed I could smell again, chronic nasal congestion was significantly reduced. Use of asthma inhalers reduced dramatically -- I now use an inhaler about a dozen times a year or less. M 65 6 years
10 mg 1X D
7/24/2013

 5  seasonal allergies none wonder drug for me, for my whole life i stayed inside during the late summer until it frosted. singulair is the ONLY medication i have ever taken that has worked for me M 63 5 years
1X D
6/2/2013

 5  Asthma None on Brand Singulair. Once switched to generic all symptoms returned. Told by pharmacy that the manufacturer has quit making brand since losing patent. Very frustrating F 55 6 years
10 mg 1X D
5/28/2013

 5  Seasonal asthma None Wonderful medicine. Totally erased my seasonal asthma. I can now breathe! M 64 1 months
10 MG 1X D
5/25/2013
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 2  allergy & exercise induced asthma Dreams, interrupted sleep, concentration problems, feeling gloomy, feeling disconnected, lack of caring, thoughts of dying, muscle and joint pain. Though my breathing difficulties and chest tightness did improve with this medication, the side effects started right away and worsened quickly each day. I was willing to keep taking it to see if side effects might subside, but on day 4 the muscle and joint pain during and after exercising was excruciating. I apparently just cannot tolerate this drug. F 52 4 days
10mg 1X D
5/20/2013

 1  COPD and Asthma Extreme Anger all the time. Was never able to stop feeling mad., became abusive towards my wife, which is totally opposite for me. felt like I had hate in my heart and also became very selfish. Blood pressure ALWAYS higher than before. Insomnia that even sleeping pills couldn't cure. M 52 9 months
5/15/2013

 1  Severe Asthma Bed Wetting Night Sweats Bad Dreams Depression Anger Wants to be alone Not Social Cries that I will leave him for good Lashes out for no reason Somedays no emotion Spacey Lost *** this all started in the last 7 months Bad Moody swings my son is not himself I don't know if its this med or Zyrtec but I'm removing him from this med. I've questioned it 3 yrs ago when a friend told me her daughter was being suicidal M 5 3 years
4mg
5/14/2013

 1  severe allergies insomnia Claritin and Veramyst used to control my allergies. But this year pollen was so bad I developed bronchitis. So the doctor gave me an inhaler and singulair. After the second sleepless night I started reading this site. I have no desire to find out if I will develop other side effects and I am discontinuing. F 43 2 days
10 mg 1X D
5/9/2013

 1  Sinus Night mares , crying , mood changes , crying a lot M 2 2 weeks
Granuals
5/7/2013

 1  Allergies I began having sternum pain. Then my elbows, knees, back, and hips started hurting. I thought I was getting arthritis or fibromyalgia. Finally, I realized I had just started a new medication. Pain subsided less than a week after I stopped taking the medicine. F 32 3 weeks
5/4/2013

 4  Severe allergies Absence of stuffy nose. Yay!! F 30 2 weeks
10mg
4/26/2013

 2  Asthma Anger, frustration, angst, introversion, depression, fainting My son began taking Singulair when he was 7. We were warned about behavioral issues (ADD like symptoms, insomnia, irritability, etc.) and didn't really notice any change. We recently noticed that my son was hiding it and not taking it (chalk it up to being 12?). Oddly, this surly, angry, frustrated tween I've been dealing with for 2 years went away and my son is back to his silly, funny, not perfect but fun self. He's not as obsessive and introverted (e.g., hooked on video games) and is back out playing basketball with his brother, volunteering to help with his dad, etc. We thought, for a moment, he grew out of being a surly pre-teen. But no...the day we realized he stopped taking it (mid spring-flowering trees, of course), we asked, and he insisted it was an accident and took it in front of us. He fainted at school. Come to find out that fainting is a rare but side effect of singulair. Meanwhile, I add that together with this "normal" kid who is back in our lives and I realize that something happens pre-puberty where kids just don't process it the same. If your kid is on Singulair and you're noticing the "teen angst" -- consider it might be his meds. M 12 5 years
5 mg 1X D
4/26/2013

 1  Allergy related asthma Anxiety, irregular heartbeat, weird dreams. M 65 21 days
30 1X D
4/21/2013

 1  asthma Bed wetting, nightmares, mood swings, anger outburst, very sensitive and would cry easily. My son was prescribed this medication in attempt to help his asthma. He became a different person. After reading the side effects, I decided to stop this medication. I am thankful he was only on it for 3 months. I wish we never started it. M 6 3 months
1X D
4/13/2013

 5  allergy related asthma So far so wonderful! F 48 5 days
10 mg
4/7/2013

 1  Chronic Bronchitis Irregular heartbeat, heart rate that varies from a low of 68 BPM to 160 over a 24-hour period, weight gain, inability to concentrate I never connected Singulair to any of these symptoms until I was sent to a cardiologist for high blood pressure (my normal blood pressure is low) and a very high heart rate. After a thorough heart work-up, my cardiologist could not find a reason for the symptoms and suggested that Singulair was the problem. I have now gone off the drug and will see if it makes a difference. F 69 2 years
10 mg 1X D
4/4/2013

 5  Asthma/allergies Was on name brand but insurance made me switch. Generic NOT helping. F 41 4 years
20mg
3/29/2013

 2  asthma and Mast Cell Activation Syn Weight gain....Insomnia F 29 30 days
1X D
3/25/2013
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 5  severe allergies Panic Attacks, Severe Anxiety, Depression, Lack of focus,Mood swings. Worked great for my allergies but the side effects were hellish,stope taking it and got back to normal after three days. Thank God! M 51 11 days
10mg 1X D
3/17/2013
Email
 5  control asthma None with brand singulair. Since going on generic, I have had ear pain, headachs, blured vision, and sinus pressure. Will be contacting Doctor in the morning. M 56 20 years
5MG 1X D
3/11/2013
Email
 1  Asthma Dizziness, loss of muscle strength in legs and back, overall pain in joints and headache daily. Well I could breath better but what a cost....plus insomnia, sleeping every 3rd day. No more. F 63 4 weeks
10 mg.
3/11/2013

 5  COPD w/ exercise-induced asthma I haven't experienced negative side effects. I began taking this when my albuterol inhaler (Proventil) and inhaled corticosteroid (Pulmicort) were not adequately treating my shortness of breath. In subsequent years, my pulmonologist added Spriva, and I am now taking my albuterol via nebulizer. A generic equivalent (montelukast) is now available. I've been reluctant to switch, but the cost difference is substantial. Now I've seen some reviews (on this site and elsewhere) from people who, like me, had a good, long-term experience with the brand drug, but began experiencing seriously negative side effects when they switched to the generic. I wonder if anyone else has noticed this. F 62 8 years
10 MG 1X D
3/10/2013
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 1  COPD, breathing problems took 2 different times. wasn't sure what med was my problem. started cortef same time. last time took 3 days. head itching,red spots in scalp,flaking, BP went up, can't sleep, shaking, face red, attention span not good. was in hospital for anxiety befor starting these 2 new meds. Don't like what i read about side effects every1 is having! M 62 3 days
30mg 1X D
3/5/2013

 1  Asthma/Allergy nightmares, hair loss, depression, suicidal ideology. I am posting on behalf of my daughter, age 16. She was on Singulair for approx. 6 years, switching over to the generic form August 2012. Mood changes were gradual and attributed to "teenager". Five weeks ago, the thoughts of suicide were dominant and she was removed from the drug asap - they are unsure if it is her age or the switch to the generic form that triggered this. My question is - how long before the aftereffects of this drug go away? The hair loss has just started improving but the suicidal thoughts are still present. (yes, she is under a doctor's care and seeing a therapist) F 16 6 years
5-10mgs. 1X D
2/28/2013
Email
 1  Sinusitis The drug was great at eliminating nasal congestion and reducing my cough but only one pill kept me wake. I took the pill the first day in the morning. At 4:00AM the next morning I was still looking at the clock. I also felt disconnected from myself. After only one pill I realize I can't tolerate this drug and will not ever take it again. F 54 1 days
10 MG 1X D
2/24/2013
Email
 5  seasonal allergies None F 38 10 years
10mg 1X D
1/24/2013

 1  Allergies Hallucination, night terror, fear, anxiety, restless, insomnia, etc. My two boys 7 and 8, and myself 38 has been on this drug 6 months and longer,and I NEVER did the connection to this drug till a friend of mine mention her problem with her child and had made the connection to this medication. I found this site and I was very much disturbed reading other parents description on their children. It was like reading my own children's problem. My son after being on this med were telling me he saw an angel at night staring at him by his door,both boys were afraid to go to different areas of the house, mode swings, terrified to go to sleep in fear of the bad dreams, 3-4 hours every night before they both could fall asleep, wetting their beds, could not sit still at dinner etc, legs keep moving and they were very restless, teasing each other all the time about everything, crying very easy, both started talking more about death and had a lot of deep questions about it. They were both getting very sensitive about things and very emotional about things, panic attacks, example: one son was very overwhelmed about how he was going to care for his teddy bears and had a panic attack and hyperventilate about it, you could see the fear in their eyes. Fear about the weather all the time... I can go on and on and on and my two boys had changed so much in just six months. I thought maybe they were just going through a phase. I also have a third boy who is five who didn't have any of this behavior M 8 6 months
1/23/2013

 3  Asthma & Allergies My child has been taking Singulair. She experiences excessive bed wetting. Another issue is that her teeth are all full of decay and we are wondering if its the little pink pill that sits on her teeth all night long after we dispense at bedtime. Have other families seen tooth decay/broken molars as an issue with Singulaire? I know if we stay on this medication, we are changing the time we give her the Singulaire chewable pill, definitely before brushing our teeth. F 6 2 years
5MG 1X D
1/21/2013
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 1  Severe allergies Severe anxiety attacks-even at home for no apparent reason, irritability, sadness, lack of interest, unusual thoughts of death, feelings as though I were going to faint F 38 9 months
30
1/21/2013

 3  Bronchittis sinusitis asthma I am so happy to have found this site. Now i know im not crazy! thank you! I have had night terrors insomnia general ill ease and ANGER! omg I was cleaning the kitchen and ended up kicking some bowls that were out of place. I mean Come On! Irritability is off the hook. I am stopping tomorrow. It did help clear my stuffy nose- and helped with coughing. But nothing is worth these horrible side effects. Back to Dulera and simbicort religiously. F 38 2 months
10mg
1/14/2013

 2  Allergies Aggresion, Irritable, major mood swings - jumpy muscles and twitches, major stomach issues with pain and bowel problems, terrible headaches I liked the way it worked on my allergies but the side effects were awful- the whole twitch - jumpy leg thing scared me to pieces! F 48 30 days
1X D
1/11/2013
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 5  Severe Asthma & Angioedema Within the 1st week, crazy vivid dreams. Then, after 3 months of consistently taking meds: insomnia (restlessness in bed, jumpy legs), severe irratibility (snapping at people over minor issues, total loss of patience), and scary agression (almost reached out & slapped someone in anger - i have never hit anyone in my life & rarely raise my voice). This drug is a miracle for me, it was the only med to completely fix my severe recurring angioadema and athsma allowing me to return to work (in truth, to hold a job) and sleep at night without waking up b/c I couldn't breathe. I'm so saddened these side effects have started. I don't know what to do; no other medication has so effectively helped, but I can't imagine continuing with this severe change in my personality - it scares me and it's not fair to my family. F 40 3 months
10 1X D
1/7/2013
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