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Zyrtec Abnormal Behaviour Side Effects

Zyrtec Abnormal Behaviour Side Effect Reports


The following Zyrtec Abnormal Behaviour side effect reports were submitted by healthcare professionals and consumers.

This information will help you understand how side effects, such as Abnormal Behaviour, can occur, and what you can do about them.

A side effect could appear soon after you start Zyrtec or it might take time to develop.



Mood Altered, Anger, Psychomotor Hyperactivity, Palpitations, Condition Aggravated, Abnormal Behaviour

This Abnormal Behaviour side effect was reported by a consumer or non-health professional from US. A 3-year-old female patient (weight:NA) experienced the following symptoms/conditions: NA. The patient was prescribed Zyrtec (dosage: 1/2 Tsp?twice Daily), which was started on NS. Concurrently used drugs: NA. When starting to take Zyrtec the consumer reported the following symptoms:
  • Mood Altered
  • Anger
  • Psychomotor Hyperactivity
  • Palpitations
  • Condition Aggravated
  • Abnormal Behaviour
These side effects may potentially be related to Zyrtec.
Anxiety, Nervousness, Suicidal Ideation, Abnormal Behaviour

This Abnormal Behaviour Zyrtec side effect was reported by a health professional from US on Jun 12, 2013. A Female , child 11 years of age, was diagnosed with and was treated with Zyrtec. The patient presented the following health conditions:
  • Anxiety
  • Nervousness
  • Suicidal Ideation
  • Abnormal Behaviour
. Zyrtec dosage: Qhs. Additional drugs used at the same time: NA.
Dysarthria, Amnesia, Abnormal Behaviour, Dizziness, Headache, Off Label Use

This is a Zyrtec side effect report of a 11-year-old patient (weight:NA) from CH, suffering from the following symptoms/conditions: NA, who was treated with Zyrtec (dosage:5 Mg Qd, Half Tablet, start time: Oct 06, 2012), combined with: NA., and developed a serious reaction and a Abnormal Behaviour side effect. The patient presented with:
  • Dysarthria
  • Amnesia
  • Abnormal Behaviour
  • Dizziness
  • Headache
  • Off Label Use
which developed after the beginning of treatment. This side effect report can indicate a possible existence of increased vulnerability to Zyrtec treatment in patients suffering from NA, resulting in Abnormal Behaviour.

Head Injury, Loss Of Consciousness, Palpitations, Balance Disorder, Abnormal Behaviour, Nonspecific Reaction, Dizziness

A 52-year-old patient (weight: NA) from US with the following symptoms: NA started Zyrtec treatment (dosage: NA) on NS. Soon after starting Zyrtec treatment, the consumer experienced several side effects, including:
  • Head Injury
  • Loss Of Consciousness
  • Palpitations
  • Balance Disorder
  • Abnormal Behaviour
  • Nonspecific Reaction
  • Dizziness
. Concurrently used drugs: NA. This finding indicates that some patients can be more vulnerable to developing Zyrtec side effects, such as Abnormal Behaviour.
Abnormal Behaviour, Emotional Disorder

A patient from UNITED STATES was prescribed and started Zyrtec on Mar 23, 2012. Patient felt the following Zyrtec side effects: abnormal behaviour, emotional disorder Additional patient health information: male , child 5 years of age, The consumer reported the following symptoms: . Zyrtec dosage: NA. Concurrently used drugs: NA.
Suicide Attempt, Abnormal Behaviour, Paranoia, Anxiety, Aggression, Suicidal Ideation, Tearfulness, Stress, Abdominal Pain

This report suggests a potential Zyrtec Abnormal Behaviour side effect(s) that can have serious consequences. A female patient from UNITED STATES (weight:NA) was diagnosed with the following health condition(s): NA and used Zyrtec (dosage: NA) starting Jan 01, 2009. Soon after starting Zyrtec the patient began experiencing various side effects, including:
  • Suicide Attempt
  • Abnormal Behaviour
  • Paranoia
  • Anxiety
  • Aggression
  • Suicidal Ideation
  • Tearfulness
  • Stress
  • Abdominal Pain
Drugs used concurrently:
  • Benadryl
  • Acetaminophen (Unk)
  • Sudafed 12 Hour
  • Nyquil (10 Tablets)
  • Yaz (Unk)
  • Yaz (Unk)
  • Nyquil (9 Tablets)
  • Yaz
The patient was hospitalized. Although Zyrtec demonstrated significant improvements in a number of clinically relevant cases, troublesome symptoms, such as Abnormal Behaviour, may still occur.
Abnormal Behaviour, Depression Suicidal

An adverse event was reported by a consumer or non-health professional on Dec 21, 2010 by a male taking Zyrtec (dosage: 5mg./10mg. 1 To 2 Daily Po) was diagnosed with and. Location: UNITED STATES , child 5 years of age, weighting 36.00 lb, patient began experiencing various side effects, including: Directly after treatment started, patient experienced the unwanted or unexpected Zyrtec side effects: abnormal behaviour, depression suicidal. Additional medications/treatments:
Abnormal Behaviour, Aggression, Depressed Mood, Fatigue, Mood Altered

This Abnormal Behaviour problem was reported by a consumer or non-health professional from UNITED STATES. A 5-year-old patient (weight: NA) was diagnosed with the following medical condition(s): seasonal allergy.On Apr 02, 2010 a consumer started treatment with Zyrtec (dosage: Dosage For 5 Year Old/weight 1x Day Po). The following drugs/medications were being taken at the same time: NA. When commencing Zyrtec, the patient experienced the following unwanted symptoms /side effects:
  • Abnormal Behaviour
  • Aggression
  • Depressed Mood
  • Fatigue
  • Mood Altered
Although all drugs are carefully tested before they are licensed for use, they carry potential side effect risks. Some side effects, such as Abnormal Behaviour, may become evident only after a product is in use by the general population.
Abnormal Behaviour, Feeling Drunk, Somnolence

This is a Zyrtec side effect report of a 4-year-old patient (weight: NA) from UNITED STATES. The patient developed the following symptoms/conditions: hypersensitivity and was treated with Zyrtec (dosage: 1 Teaspoon 1 In The Eve Po) starting Mar 28, 2010. Concurrently used drugs: NA. Soon after that, the consumer experienced the following of symptoms:
  • Abnormal Behaviour
  • Feeling Drunk
  • Somnolence
This opens a possibility that Zyrtec could cause Abnormal Behaviour and that some patients may be more susceptible.
Abnormal Behaviour, Choking, Overdose, Somnolence, Vomiting

This Abnormal Behaviour side effect was reported by a consumer or non-health professional from UNITED STATES on Apr 15, 2010. A patient from UNITED STATES , child 5 years of age, weighting 39.90 lb, was treated with Zyrtec. Directly after treatment started, patient experienced the unwanted or unexpected Zyrtec side effects: abnormal behaviour, choking, overdose, somnolence, vomiting. Zyrtec dosage: Text:1.5 Teaspoonfuls Once A Day. These side effects may potentially be related to Zyrtec.
Abnormal Behaviour, Aggression, Crying, Epistaxis, Headache, Increased Appetite, Irritability, Mood Swings, Nightmare

This Abnormal Behaviour side effect was reported by a consumer or non-health professional from UNITED STATES. A 5-year-old patient (weight:NA) experienced the following symptoms/conditions: hypersensitivity. The patient was prescribed Zyrtec (dosage: 2.5 Ml-5ml Every @4 Hours Po), which was started on NS. Concurrently used drugs: NA. When starting to take Zyrtec the consumer reported the following symptoms:
  • Abnormal Behaviour
  • Aggression
  • Crying
  • Epistaxis
  • Headache
  • Increased Appetite
  • Irritability
  • Mood Swings
  • Nightmare
These side effects may potentially be related to Zyrtec.
Abnormal Behaviour, Condition Aggravated, Off Label Use, Therapeutic Response Unexpected, Urticaria

This Abnormal Behaviour Zyrtec side effect was reported by a consumer or non-health professional from UNITED STATES on Jun 04, 2009. A male , child 11 years of age, weighting 54.01 lb, was diagnosed with and was treated with Zyrtec. The patient presented the following health conditions:
  • Abnormal Behaviour
  • Condition Aggravated
  • Off Label Use
  • Therapeutic Response Unexpected
  • Urticaria
. Zyrtec dosage: Text:one Tablet Once Daily. Additional drugs used at the same time:
  • Zoloft (Text:25 Mg, Once Daily)
  • Risperdal (Text:0.25 Mg, Once Daily)
The patient was hospitalized.
Abnormal Behaviour, Condition Aggravated, Off Label Use, Therapeutic Response Unexpected, Urticaria

This is a Zyrtec side effect report of a 11-year-old patient (weight:NA) from UNITED STATES, suffering from the following symptoms/conditions: seasonal allergy,depression, who was treated with Zyrtec (dosage:Text:one Tablet Once Daily, start time: Apr 01, 2009), combined with:
  • Zoloft (Text:25 Mg, Once Daily)
  • Risperdal (Text:0.25 Mg, Once Daily)
, and developed a serious reaction and a Abnormal Behaviour side effect. The patient presented with:
  • Abnormal Behaviour
  • Condition Aggravated
  • Off Label Use
  • Therapeutic Response Unexpected
  • Urticaria
which developed after the beginning of treatment. The patient was hospitalized. This side effect report can indicate a possible existence of increased vulnerability to Zyrtec treatment in patients suffering from seasonal allergy,depression, resulting in Abnormal Behaviour.
Abnormal Behaviour, Aggression, Agitation, Crying, Self Injurious Behaviour

A female patient (weight: NA) from UNITED STATES with the following symptoms: multiple allergies,rhinorrhoea,sneezing started Zyrtec treatment (dosage: 1/2 Tsp Once Daily Po 3 Months/daily) on Mar 26, 2009. Soon after starting Zyrtec treatment, the consumer experienced several side effects, including:
  • Abnormal Behaviour
  • Aggression
  • Agitation
  • Crying
  • Self Injurious Behaviour
. Concurrently used drugs: NA. This finding indicates that some patients can be more vulnerable to developing Zyrtec side effects, such as Abnormal Behaviour.
Abnormal Behaviour, Aggression, Anger, Suicidal Ideation

A female patient from UNITED STATES was prescribed and started Zyrtec on Sep 08, 2008. After Zyrtec was administered, patient encountered several Zyrtec side effects: abnormal behaviour, aggression, anger, suicidal ideation Additional patient health information: Female , child 11 years of age, weighting 78.00 lb, The consumer reported the following symptoms: was diagnosed with and. Zyrtec dosage: 10mg At Bedtime Po. Concurrently used drugs: NA.
Abnormal Behaviour, Aggression, Emotional Disorder, Irritability, Mood Swings, Nightmare, Pruritus, Sleep Disorder, Suicidal Ideation

This report suggests a potential Zyrtec Abnormal Behaviour side effect(s) that can have serious consequences. A female patient from UNITED STATES (weight:NA) was diagnosed with the following health condition(s): hypersensitivity and used Zyrtec (dosage: 1/2 Tsp Nightly Oral) starting Oct 01, 2007. Soon after starting Zyrtec the patient began experiencing various side effects, including:
  • Abnormal Behaviour
  • Aggression
  • Emotional Disorder
  • Irritability
  • Mood Swings
  • Nightmare
  • Pruritus
  • Sleep Disorder
  • Suicidal Ideation
Drugs used concurrently:NA. Although Zyrtec demonstrated significant improvements in a number of clinically relevant cases, troublesome symptoms, such as Abnormal Behaviour, may still occur.
Abnormal Behaviour, Anger, Condition Aggravated

An adverse event was reported by a consumer or non-health professional on Jul 30, 2008 by a Female taking Zyrtec (dosage: NA) was diagnosed with and. Location: UNITED STATES , child 2 years of age, patient began experiencing various side effects, including: Patient felt the following Zyrtec side effects: abnormal behaviour, anger, condition aggravated. Additional medications/treatments:
Abnormal Behaviour, Dizziness, Feeling Abnormal, Nausea, Psychomotor Hyperactivity, Suicidal Ideation

This Abnormal Behaviour problem was reported by a consumer or non-health professional from UNITED STATES. A 56-year-old female patient (weight: NA) was diagnosed with the following medical condition(s): hypersensitivity.On May 05, 2008 a consumer started treatment with Zyrtec (dosage: 1 Tablet 1 X A Day, Oral). The following drugs/medications were being taken at the same time: NA. When commencing Zyrtec, the patient experienced the following unwanted symptoms /side effects:
  • Abnormal Behaviour
  • Dizziness
  • Feeling Abnormal
  • Nausea
  • Psychomotor Hyperactivity
  • Suicidal Ideation
Although all drugs are carefully tested before they are licensed for use, they carry potential side effect risks. Some side effects, such as Abnormal Behaviour, may become evident only after a product is in use by the general population.
Abnormal Behaviour, Disturbance In Attention, Fatigue, Feeling Abnormal, Lethargy, Sensation Of Heaviness, Somnolence

This is a Zyrtec side effect report of a female patient (weight: NA) from UNITED STATES. The patient developed the following symptoms/conditions: hypersensitivity and was treated with Zyrtec (dosage: 1 Pill Per Day Po) starting May 19, 2008. Concurrently used drugs: NA. Soon after that, the consumer experienced the following of symptoms:
  • Abnormal Behaviour
  • Disturbance In Attention
  • Fatigue
  • Feeling Abnormal
  • Lethargy
  • Sensation Of Heaviness
  • Somnolence
This opens a possibility that Zyrtec could cause Abnormal Behaviour and that some female patients may be more susceptible.
Abnormal Behaviour, Aggression, Anger, Irritability, Lethargy, Mood Swings, Oppositional Defiant Disorder, Sleep Disorder

This Abnormal Behaviour side effect was reported by a consumer or non-health professional from UNITED STATES on May 13, 2008. A patient from UNITED STATES , weighting 35.00 lb, was diagnosed with and was treated with Zyrtec. Patient felt the following Zyrtec side effects: abnormal behaviour, aggression, anger, irritability, lethargy, mood swings, oppositional defiant disorder, sleep disorder. Zyrtec dosage: 2.5 Mg 1x Daily Po. These side effects may potentially be related to Zyrtec.
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DISCLAIMER: ALL DATA PROVIDED AS-IS, refer to terms of use for additional information.

Zyrtec Abnormal Behaviour Causes and Reviews


Alcohol can harm your baby at any stage during a pregnancy. That includes the earliest stages, before you even know you are pregnant. Drinking during pregnancy can cause a group of conditions called fetal alcohol spectrum disorders (FASDs). Children who are born with FASD can have a mix of problems, such as medical, behavioral, educational, and social problems. The kinds of problems they have depend on which type of FASD they have. The problems could include

  • Abnormal facial features, such as a smooth ridge between the nose and upper lip
  • Small head size
  • Shorter-than-average height
  • Low body weight
  • Poor coordination
  • Hyperactive behavior
  • Difficulty with attention and memory
  • Learning disabilities and difficulty in school
  • Speech and language delays
  • Intellectual disability or low IQ
  • Poor reasoning and judgment skills
  • Sleep and sucking problems as a baby
  • Vision or hearing problems
  • Problems with the heart, kidneys, or bones

Fetal alcohol syndrome (FAS) is the most serious type of FASD. People with fetal alcohol syndrome have facial abnormalities, including wide-set and narrow eyes, growth problems and nervous system abnormalities.

Diagnosing FASD can be hard because there is no medical test for it. The health care provider will make a diagnosis by looking at the child's signs and symptoms, and will ask whether the mother drank alcohol during pregnancy.

FASDs last a lifetime. There is no cure for FASDs, but treatments can help. These include medicines to help with some symptoms, medical care for health problems, behavior and education therapy, and parent training. A good treatment plan is specific to the child's problems. It should include close monitoring, follow-ups, and changes when needed.

Certain "protective factors" can help reduce the effects of FASDs and help people who have them reach their full potential. They include

  • Diagnosis before 6 years of age
  • Loving, nurturing, and stable home environment during the school years
  • Absence of violence around them
  • Involvement in special education and social services

There is no known safe amount of alcohol during pregnancy. To prevent FASDs, you should not drink alcohol while you are pregnant, or when you might get pregnant.

Centers for Disease Control and Prevention


Zyrtec Abnormal Behaviour Reviews

Fri, 21 May 2010

I took one dose and experienced a bout of pancreatitis. I suffer from chronic pancreatitis and know what most of my "triggers" are.....never thought a simple allergy medication would cause such a problem, I think I would rather suffer allergies than risk pancreatitis.

Sat, 05 Nov 2011

Started on Zyrtec on the suggestion of my dermatologist for treatment of hives. Rash that resulted from the Zyrtec a MILLION times worse than the original hives. Had the same reaction to Seldane.

Tue, 09 Feb 2010

I have Type 2 Diabetes, when taking my level in the morning I noticed my level was elevated, and the only thing I had ingested was a Zyrtec pill about 2 hours prior? Could the pill be the cause?

Wed, 03 Dec 2008
Does Zyrtec inrease blood sugar levels? I have been taking 10m a day for 10 days and have notices symptoms of high blood sugar, when tested it was in the high 100's. Has anyone heard of this side effect?
Sat, 13 Aug 2011
I have had and am having a bad reaction to Zyrtec. My eyes are inflamed and my throat is sore. Lips are swollen. My tongue is white. I will be forced to go to the Emergency at the hospital.
Sun, 28 Mar 2010
I took Zyrtec for a week and while it does solve my allergy issues, it makes me a raving lunatic. Severe aggression, mood swings, and nightmares are the norm for me n this medicine. I would not recommend it if you are taking any anti anxiety or anti depressants.
Mon, 23 May 2011
bad gastritis or abdominal pain; had to get into tub with hot shower on my belly;never had a worse experience or pain; thought I was going to die; malaise; moderate ear pain
DISCLAIMER: ALL DATA PROVIDED AS-IS, refer to terms of use for additional information.

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Top Zyrtec Side Effects

Pruritus (212)
Pain (145)
Fatigue (145)
Dizziness (140)
Somnolence (133)
Urticaria (132)
Dyspnoea (132)
Nausea (116)
Hypersensitivity (114)
Headache (113)
Insomnia (112)
Depression (105)
Feeling Abnormal (105)
Rash (103)
Anxiety (96)
Off Label Use (94)
Convulsion (93)
Product Quality Issue (92)
Condition Aggravated (80)
Abnormal Behaviour (79)
Loss Of Consciousness (43)
Aggression (43)
Overdose (41)
Withdrawal Syndrome (39)
Injury (39)
Pulmonary Embolism (38)
Irritability (36)
Vomiting (36)
Pyrexia (36)
Abdominal Pain Upper (35)
Deep Vein Thrombosis (34)
Hallucination (34)
Fall (34)
Asthma (33)
Diarrhoea (31)
Palpitations (30)
Malaise (30)
Suicidal Ideation (29)
Blood Pressure Increased (28)
Abdominal Pain (28)
Disturbance In Attention (27)
Cough (27)
Pain In Extremity (27)
Contusion (26)
Dry Mouth (26)
Chest Discomfort (26)
Anger (25)
Cholecystitis Chronic (25)
Weight Increased (25)
Back Pain (24)

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