My son now 8 was taking Singulair when he was about six months old. Thinking back he used to have extreme tantrums and it was difficult to calm him down. Maybe he was having hallucinations at the time. He took Singulair for a few months in his bottle. When his brother was born, he was three years old and jealousy used to trigger uncontrollable tantrums where he seemed to take different personality with difficulty speaking, screaming and running. He could be a great kid one minute and turn into an uncontrollable monster following certain triggers. Now his allergies have subsided and is no longer taking allergy medicine. Although his behavior has improved he still has tantrums and during these tantrums he may curse, run around like he doesn’t know where he is going , talk like a young child and contort his body in strange positions, may have difficulty walking. It is now easier to talk him out of it. When he gets violent I have to pin him down and restrain him during which time he fights me, screams and can’t look at me in the eyes. When he comes out of it he apologizes and asks for help. He is very hard with his litter brother and so we constantly have to tell him to keep his hands to himself. He also took Zyrtec for some time. At school he functions very well , has good grades but I think we get the brunt of it at home when he has had a bad day. A psychiatrist diagnosed him with functioning ADHD and oppositional defiance dissorder. We are seeing a therapist but he behaves well there. A few times we have tried to take him to he psychiatric hospital but didn’t make it. I keep thinking that Singulair may have caused this problem. So far we haven’t been able to control the tantrums. Clearly my son has remorse after but doesn’t seem to be himself I am concerned for his future.

I have been taking Singulair (generic) for about 7 weeks. I have experienced crazy sleep patterns, terrible anxiety, some depression, and definite mood swings. At first I just thought it was a bad month in this menopause process, but have finally come to the conclusion it has to be the Singulair. I also take Zyrtec and believe the mixture may also contribute to the problem. I have also gained weight that is highly unusual. I have always been really thin and now I feel like a blimp. The unfortunate side of this is – I have insomnia, and for once, Iam sleeping – seemingly another “weird” side effect – but that works for me and is one of the blessings of it. But since it makes me sleep – that in itself says it is working on brain chemicals abnormally. Hate to admit it, but I think I have to say good bye to this wonderful asthma and allergy drug. I have taken my last one. I am looking forward to feeling “normal and not crazy again.”

Not to underestimate the side effects of a drug, they can often not be predicted.

Myself and my three kids have taken singulair with NO side effects like that. In fact the drug completely changed my kids life for the positive, sick always running to the hospital for asthma treatments, not growing because of the steroids. And on singulair, less treatments, less steroids, less trips to the hospital, less trauma of the oxygen mask, and for one kid less eczema.

I am not saying singulair didn’t cause these symptoms, i am just pointing out they don’t cause them in everyone.

I think mixing Singulair with other meds might have a lot to do with it and this of course is less documented and studied.

take care or yourself.

Our son, then 8 years old (now 14), was prescribed Singulair for his asthma. His doctors NEVER once mentioned any side effects. The paper they gave us at their office only listed “stomach upset” as a possible side effect. Within a few weeks, the nightmares started, along with not wanting to brush teeth because “there are bugs in the water, mom!” Became paranoid, saw things that weren’t there…. Sad thing is is that he knew they weren’t there. To hear a little boy keep asking, “What’s wrong with me?” One night (husband out of town) things got so bad that my friend told me to take him to the emergency room at Children’s Hospital. After a couple hours with the doctor, I am the one who came up with the idea that it was his meds. All the hospital wanted to do was give him activities to do when he was having an episode….. “read the phone book”, “match socks together”, anything to keep his mind occupied. Well, I wanted to know what had changed my perfectly happy child into a psychotic mess! Didn’t take long on the internet to figure it all out. I should have sued his allergy doctor for mental anguish. It took about 2 or 3 weeks after we stopped the Singulair for him to feel completely normal again. WORST, WORST experience of my life!!!!!

My doctor prescribed singulair to enhance the over the counter loratadine allergy med I am taking for my seasonal allergies. That is the only med I’m on. I took singulair for 3 nights and had nightmares each night. 3rd night was the worst – bats were attacking me, sticking to my arm, I’d have to peel them off and they’d stick right back on like they were magnetized. They were injecting me with stingers. If you’ve ever been on chloroquine (anti-malarial) and had chloroquine nightmares, it’s similar to that hell. 3 nights was enough for me – I stopped taking them. Never again.

I took montelukast in the winter 2009, i had then a depressive syndrom but i didn’t make the relationship in betwin first. I stoped it because it was no one effect on my asthma. On day, 3 month after, i took on pills of singulair, one hour after, i started to be creazy, i fell my brain like melting, and then i have made the relationship, of my depressive syndrom and the laps i took that toxic pill.
Of course i spok about it to my allergologue docteur, he aproove this way to describe the sides effect: stop treatment and retaking it suddenly.
I told him how can you give it to a child? A can a child speak about his mental feeling? For some adult it’s difficult, so…
Don’t take that pills! Besides there is no effect on asthma.
Singulair shouldn’t be allowed simply.
Pierre 37 old today in 2017, nurse.
From Nantes, france.
Nb: sorry for my english.

I moved into a new apartment about a year ago and began seeing a great increase in asthma attacks. This last spring my doctor concluded their was probably a mold issue in my basement apartment. I concurred, and he placed me on singulair.

The problems began immediately. I began having super vivid nightmares. They never let up. I immediately saw an uptick in Lupus flares, the worst I have had in years. Also, my neuropathy symptoms began suddenly getting much worse. Again, for the first time in years…

Additionally within the last month, after seven months on singulair, I began having kidney pain and extreme nausea in my lower abdomen, which was quite unusual. My neuropathic pain invaded my abdomen, my ribcage, my neck. I began shaking all the time and getting angry for little reason. I began having migraines again for the first time in two decades. I have had trouble swallowing, wasn’t able to sleep on a normal schedule and was suddenly experiencing neuropathic spasms at an ungodly rate, the frequency of which I had never experienced.

In the last week, I had begun to fear that my lupus was shutting down my kidneys and this may be it for me.

And then… it occurred to me that ALL of these horrendous symptoms started when I began taking singulair.

I stopped taking the singulair two days ago. I already feel better. I am sleeping better, my shakes and spasms are dissipating and the weird lower abdomen nausea (almost like very strange menstral cramps) has disappeared.

Sadly, this is the second time I stopped taking singular. I was on it a few years ago and had problems. I have a pcp who has no idea of how to deal with autoimmune issues and who’s only answer to anything is to push dangerous drugs on me. I obviously have to watch him like a hawk, and it’s my bad for letting him do this to me twice.

Back to my inhaler and nasonex (at least neither cause me any major problems) for me and the hope that my system adjusts to this apartment. Otherwise, I’ll move… but I won’t EVER take the chance on Singulair again.

After being through the ringer my 78 yr old mom is monitored by us when put on new drug. Singular recently, she was on it maybe five days, i began to notice a change in her, very quite, distant, very forgetful, and when asked how she felt was very agressive with “I am fine, dont worry”. I was worried, she has now been off of it for two days, she is back to herself, i have zero doubt it was the new drug. We have learned alot since Mom has been sick with a stomach issues that drugs can caues more problems in a health issue, so dont always think its another problem, check side effects to all drugs you or family members are prescribed. The crazist part is that the warning is always consult your doctor if you have ANY side effects, we would, they would never think or say it was the drug, no it would be another health issue, prescribe more drugs, pay attention, dont think you cant question the doctor, we did, saved our mothers life twice!!

I may have lost the love of my life (Lucia) because of the effects of Montelukast. After three of the most wonderful months I have ever spent with anyone, I started to undergo unusual changes after taking the drug for a month. First, the nightmares. One was about Lucia being a bad person, which was extremely disturbing. I told her about the dream (mistake!) and it really bothered her. Then I started crying easily, over nearly anything (not normal). Then the extreme anxiety set in which significantly reduced my appetite. All the while, my thought patterns were changing, just not myself. Even began having suicidal thoughts that would drift in and out of my mind uncontrollably. Poor Lucia! She could sense changes in me and it was scaring her away. Anyway, been off of the drug for 5 days and feeling much better. Hopefully Lucia will see the Tom she fell in love with again soon.

I’m 39 now, I started taking singulair when I was 18. And it almost killed me several times. And I was almost committed because of Singulair. It created a self destruct button in my head and it was like a second voice I could talk to. I got know the inside of the psych ward very well as it made me very suicidal and I never understood why. Then the meds they gave me to treat what they thought was bipolar never worked as it was treating singulair. When I stopped taking it after a car accident as it also suppressed my immune system, I found the self destruct button gone and the voice gone. I’ll probably never fully recover from the trauma of over a decade of hell and being made to feel insane. Luckily Singulair was not successful at taking my life. I’m still on SSI from it, I never had mental health issues before Singulair! And know I probably suffered permanent brain damage from all the overdoses from meds that made me manic from trying to treat Singulair that was making me suicidal…as no one suspected Singulair at that time and the information was just coming to light towards the end of my battle with it. If my immune system hadn’t tanked I’d probably be dead as it was the reason I went off Singulair only to then discover what else it was doing to me. I used to trust my asthma meds were safe as I had been on just about all of them since I was 5 yrs old. Never again. I use organic Elderberry syrup and natural supplements to manage my asthma and allergies now and it’s 100x better than any of those nasty meds! It’s been 5 yrs now since I stopped taking Singulair and life is so much better with the self destruct button/ voice gone! I remember standing in the middle of a hiking trail after getting rid of Singulair and having just had an argument with my husband and saying to him “The self destruct button/ voice telling me to kill myself is gone!” I had lived with it so long that it felt like a piece of my brain was gone…not that I will ever miss it! All I can do is continue to tell others to never let a loved one take Singulair! I wish I could sue them for everything I lost! I will never put my middle son on any of those meds as he takes after me with allergies and I have been able to treat him naturally as well. No one talks about the debilitating anxiety all these meds leave you with either! And I want those suffering to know there is another path if they are willing to do the research and use the information studies have found that those of us with asthma and allergies are deficient in certain vitamins etc. man made meds with horrible side effects doesn’t have to be your only choice. I used to be so scared thinking I wasn’t treatable only to find out it was Singulair making me sick. Also for those still taking Zyrtec, it says on there is can cause sinusitis…not after ditching that as well, I have next to no episodes of sinusitis in 5 yrs!

I took montelukast (Singulair) for years as a kid and subsequently developed depression, anxiety, and suicidal thoughts that continue to today, 15 years later. I’ve been in and out of therapist’s office for years, and have also developed PTSD due to increased sensitivity to trauma brought on by the effects of the drug.