Zyrtec Loss Of Consciousness Side Effect Reports


The following Zyrtec Loss Of Consciousness side effect reports were submitted by healthcare professionals and consumers.

This information will help you understand how side effects, such as Loss Of Consciousness, 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.


Loss Of Consciousness, Blood Pressure Decreased

This Loss Of Consciousness side effect was reported by a consumer or non-health professional from US. A 80-year-old female patient (weight:NA) experienced the following symptoms/conditions: NA. The patient was prescribed Zyrtec-d (dosage: NA), which was started on NS. Concurrently used drugs: NA. When starting to take Zyrtec-d the consumer reported the following symptoms:
  • Loss Of Consciousness
  • Blood Pressure Decreased
These side effects may potentially be related to Zyrtec-d.
Immune System Disorder, Anaphylactic Reaction, Loss Of Consciousness, Urticaria, Rash, Overdose, Pyrexia

This Loss Of Consciousness Zyrtec Ir side effect was reported by a consumer or non-health professional from US on Jun 11, 2013. A male , 45 years of age, weighting 190.0 lb, was diagnosed with and was treated with Zyrtec Ir. The patient presented the following health conditions:
  • Immune System Disorder
  • Anaphylactic Reaction
  • Loss Of Consciousness
  • Urticaria
  • Rash
  • Overdose
  • Pyrexia
. Zyrtec Ir dosage: NA. Additional drugs used at the same time: NA. The patient was hospitalized.
Blood Pressure Decreased, Loss Of Consciousness, Fall, Pallor, Malaise

This is a Zyrtec side effect report of a 6.-year-old female patient (weight:NA) from JP, suffering from the following symptoms/conditions: NA, who was treated with Zyrtec (dosage:NA, start time: Sep 03, 2012), combined with: NA., and developed a serious reaction and a Loss Of Consciousness side effect. The patient presented with:
  • Blood Pressure Decreased
  • Loss Of Consciousness
  • Fall
  • Pallor
  • Malaise
which developed after the beginning of treatment. This side effect report can indicate a possible existence of increased vulnerability to Zyrtec treatment in female patients suffering from NA, resulting in Loss Of Consciousness.
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 Loss Of Consciousness.
Dyspnoea, Dizziness, Loss Of Consciousness, Palpitations

A patient from US was prescribed and started Zyrtec Ir on Sep 27, 2012. Patient felt the following Zyrtec side effects: dyspnoea, dizziness, loss of consciousness, palpitations Additional patient health information: male , 23 years of age, weighting 125.0 lb, The consumer reported the following symptoms: . Zyrtec Ir dosage: NA. Concurrently used drugs: NA.
Loss Of Consciousness, Pain In Extremity, Muscle Spasms, Off Label Use, Hyperhidrosis, Constipation, Nausea

This report suggests a potential Zyrtec Ir Loss Of Consciousness side effect(s) that can have serious consequences. A 61-year-old female patient from US (weight:NA) was diagnosed with the following health condition(s): NA and used Zyrtec Ir (dosage: NA) starting Apr 17, 2012. Soon after starting Zyrtec Ir the patient began experiencing various side effects, including:
  • Loss Of Consciousness
  • Pain In Extremity
  • Muscle Spasms
  • Off Label Use
  • Hyperhidrosis
  • Constipation
  • Nausea
Drugs used concurrently:NA. Although Zyrtec Ir demonstrated significant improvements in a number of clinically relevant cases, troublesome symptoms, such as Loss Of Consciousness, may still occur.
Presyncope, Abdominal Discomfort, Loss Of Consciousness

An adverse event was reported by a health professional on May 30, 2012 by a Female taking Zyrtec (dosage: NA) . Location: UNITED STATES , 53 years of age, patient began experiencing various side effects, including: Directly after treatment started, patient experienced the unwanted or unexpected Zyrtec side effects: presyncope, abdominal discomfort, loss of consciousness. Additional medications/treatments:
Associated medications used:
  • Tysabri
  • Tysabri
  • Acetaminophen
Head Injury, Decreased Appetite, Excoriation, Abdominal Pain Upper, Fall, Hypersomnia, Loss Of Consciousness

This Loss Of Consciousness problem was reported by a consumer or non-health professional from UNITED STATES. A patient (weight: NA) was diagnosed with the following medical condition(s): seasonal allergy,precocious puberty.On Nov 01, 2011 a consumer started treatment with Zyrtec (dosage: NA). The following drugs/medications were being taken at the same time:
  • Lupron
When commencing Zyrtec, the patient experienced the following unwanted symptoms /side effects:
  • Head Injury
  • Decreased Appetite
  • Excoriation
  • Abdominal Pain Upper
  • Fall
  • Hypersomnia
  • Loss Of Consciousness
Although all drugs are carefully tested before they are licensed for use, they carry potential side effect risks. Some side effects, such as Loss Of Consciousness, may become evident only after a product is in use by the general population.
Ventricular Flutter, Overdose, Ventricular Arrhythmia, Loss Of Consciousness, Hypokalaemia, Cardiac Arrest, Torsade De Pointes, Electrocardiogram Qt Prolonged

This is a Zyrtec side effect report of a 55-year-old female patient (weight: NA) from FRANCE. The patient developed the following symptoms/conditions: pruritus and was treated with Zyrtec (dosage: 10 Mg, 1x/day) starting Oct 23, 2003. Concurrently used drugs: NA. Soon after that, the consumer experienced the following of symptoms:
  • Ventricular Flutter
  • Overdose
  • Ventricular Arrhythmia
  • Loss Of Consciousness
  • Hypokalaemia
  • Cardiac Arrest
  • Torsade De Pointes
  • Electrocardiogram Qt Prolonged
The patient was hospitalized. This opens a possibility that Zyrtec could cause Loss Of Consciousness and that some female patients may be more susceptible.
Deep Vein Thrombosis, Pain, Cholecystitis Chronic, Embolism, Loss Of Consciousness, Pulmonary Embolism, Vaginal Haemorrhage, Bile Duct Stone, Gallbladder Disorder

This Loss Of Consciousness side effect was reported by a health professional from UNITED STATES on Jan 20, 2012. A female patient from UNITED STATES , 50 years of age, weighting 154.3 lb, was treated with Zyrtec. Directly after treatment started, patient experienced the unwanted or unexpected Zyrtec side effects: deep vein thrombosis, pain, cholecystitis chronic, embolism, loss of consciousness, pulmonary embolism, vaginal haemorrhage, bile duct stone, gallbladder disorder. Zyrtec dosage: 10 Mg, Unk.
Associated medications used:
  • Toprol-xl (25 Mg, Unk)
  • Yasmin (Unk)
  • Prozac (10 Mg, Unk)
  • Ibuprofen (Unk Unk, Prn)
  • Albuterol (Unk Unk, Prn)
  • Lexapro
  • Drospirenone And Ethinyl Estradiol (Unk)
  • Hydrocodone Bitartrate And Acetaminophen (5-500mg Tablet)
The patient was hospitalized. These side effects may potentially be related to Zyrtec.
Somnolence, Pain, Headache, Fatigue, Fall, Laceration, Loss Of Consciousness, Abdominal Pain Upper, Rash

This Loss Of Consciousness side effect was reported by a consumer or non-health professional from UNITED STATES. A 11-year-old female patient (weight:NA) experienced the following symptoms/conditions: NA. The patient was prescribed Zyrtec (dosage: NA), which was started on Nov 18, 2011. Concurrently used drugs:
  • Miralax
  • Gammagard Liquid
  • Adderall 5
  • Iron
  • Loratadine
  • Melatonin
  • Gammagard Liquid
  • Mobic
When starting to take Zyrtec the consumer reported the following symptoms:
  • Somnolence
  • Pain
  • Headache
  • Fatigue
  • Fall
  • Laceration
  • Loss Of Consciousness
  • Abdominal Pain Upper
  • Rash
The patient was hospitalized. These side effects may potentially be related to Zyrtec.
Pallor, Loss Of Consciousness, Blood Pressure Decreased

This Loss Of Consciousness Zyrtec side effect was reported by a consumer or non-health professional from NETHERLANDS on Jul 08, 2011. A male , child 11 years of age, was diagnosed with and was treated with Zyrtec. The patient presented the following health conditions:
  • Pallor
  • Loss Of Consciousness
  • Blood Pressure Decreased
. Zyrtec dosage: NA. Additional drugs used at the same time: NA. The patient was hospitalized.
Grand Mal Convulsion, Loss Of Consciousness, Petit Mal Epilepsy, Weight Increased

This is a Zyrtec side effect report of a 25-year-old female patient (weight:NA) from UNITED STATES, suffering from the following symptoms/conditions: NA, who was treated with Zyrtec (dosage:NA, start time: Feb 01, 2011), combined with:
  • Lexapro (10 Mg (10 Mg, 1 In 1 D), Oral)
, and developed a serious reaction and a Loss Of Consciousness side effect. The patient presented with:
  • Grand Mal Convulsion
  • Loss Of Consciousness
  • Petit Mal Epilepsy
  • Weight Increased
which developed after the beginning of treatment. This side effect report can indicate a possible existence of increased vulnerability to Zyrtec treatment in female patients suffering from NA, resulting in Loss Of Consciousness.
Loss Of Consciousness, Mood Swings, Vomiting, Headache, Palpitations, Presyncope, Abdominal Pain Upper, Ventricular Tachycardia, Biliary Dyskinesia

A female patient (weight: NA) from UNITED STATES with the following symptoms: seasonal allergy started Zyrtec treatment (dosage: NA) on Jul 01, 2007. Soon after starting Zyrtec treatment, the consumer experienced several side effects, including:
  • Loss Of Consciousness
  • Mood Swings
  • Vomiting
  • Headache
  • Palpitations
  • Presyncope
  • Abdominal Pain Upper
  • Ventricular Tachycardia
  • Biliary Dyskinesia
. Concurrently used drugs:
  • Oxycodone Hcl And Acetaminophen (Unit Dose 7.5/500mg)
  • Ocella
  • Ortho Tri-cyclen Lo
  • Yasmin
  • Ocella
  • Yaz
  • Zegerid
  • Yasmin
The patient was hospitalized. This finding indicates that some patients can be more vulnerable to developing Zyrtec side effects, such as Loss Of Consciousness.
Loss Of Consciousness, Memory Impairment, Fall, Face Injury, Grunting, Convulsion, Bladder Disorder

A female patient from UNITED STATES was prescribed and started Zyrtec on Feb 25, 2011. After Zyrtec was administered, patient encountered several Zyrtec side effects: loss of consciousness, memory impairment, fall, face injury, grunting, convulsion, bladder disorder Additional patient health information: Female , 32 years of age, weighting 209.0 lb, The consumer reported the following symptoms: . Zyrtec dosage: NA. Concurrently used drugs:
  • Ibuprofen
  • Xanax
  • Neurontin
  • Lidoderm
  • Meclizine /00072801/ (meclozine)
  • Avonex
  • Ampyra (10 Mg, Bid Oral)
  • Wellbutrin
The patient was hospitalized.
Blood Pressure Increased, Haematemesis, Loss Of Consciousness, Nausea

This report suggests a potential Zyrtec Loss Of Consciousness side effect(s) that can have serious consequences. A 83-year-old female patient from JAPAN (weight:NA) was diagnosed with the following health condition(s): seasonal allergy and used Zyrtec (dosage: Text:10 Mg Qd) starting Jan 01, 2000. Soon after starting Zyrtec the patient began experiencing various side effects, including:
  • Blood Pressure Increased
  • Haematemesis
  • Loss Of Consciousness
  • Nausea
Drugs used concurrently:NA. The patient was hospitalized. Although Zyrtec demonstrated significant improvements in a number of clinically relevant cases, troublesome symptoms, such as Loss Of Consciousness, may still occur.
Loss Of Consciousness

An adverse event was reported by a consumer or non-health professional on Jul 26, 2010 by a Female taking Zyrtec (dosage: NA) was diagnosed with and. Location: UNITED STATES , 65 years of age, weighting 160.1 lb, patient began experiencing various side effects, including: Patient felt the following Zyrtec side effects: loss of consciousness. Additional medications/treatments:
Convulsion, Dizziness, Loss Of Consciousness, Overdose

This Loss Of Consciousness problem was reported by a health professional from UNITED STATES. A female patient (weight: NA) was diagnosed with the following medical condition(s): seasonal allergy.On Sep 01, 2009 a consumer started treatment with Zyrtec (dosage: NA). The following drugs/medications were being taken at the same time: NA. When commencing Zyrtec, the patient experienced the following unwanted symptoms /side effects:
  • Convulsion
  • Dizziness
  • Loss Of Consciousness
  • Overdose
Although all drugs are carefully tested before they are licensed for use, they carry potential side effect risks. Some side effects, such as Loss Of Consciousness, may become evident only after a product is in use by the general population.
Convulsion, Dizziness, Loss Of Consciousness, Overdose

This is a Zyrtec side effect report of a female patient (weight: NA) from UNITED STATES. The patient developed the following symptoms/conditions: seasonal allergy and was treated with Zyrtec (dosage: NA) starting Sep 02, 2009. Concurrently used drugs: NA. Soon after that, the consumer experienced the following of symptoms:
  • Convulsion
  • Dizziness
  • Loss Of Consciousness
  • Overdose
This opens a possibility that Zyrtec could cause Loss Of Consciousness and that some female patients may be more susceptible.
Convulsion, Loss Of Consciousness, Overdose

This Loss Of Consciousness side effect was reported by a consumer or non-health professional from UNITED STATES on Sep 21, 2009. A female patient from UNITED STATES , 31 years of age, weighting 130.1 lb, was diagnosed with and was treated with Zyrtec. Patient felt the following Zyrtec side effects: convulsion, loss of consciousness, overdose. Zyrtec dosage: NA. 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 Loss Of Consciousness Causes and Reviews


Reye syndrome is a rare illness that can affect the blood, liver, and brain of someone who has recently had a viral infection. It always follows another illness. Although it mostly affects children and teens, anyone can get it. It can develop quickly and without warning. It is most common during flu season. Symptoms include

  • Nausea and vomiting
  • Listlessness
  • Personality change - such as irritability, combativeness or confusion
  • Delirium
  • Convulsions
  • Loss of consciousness

If these symptoms occur soon after a viral illness, seek medical attention immediately. Reye syndrome can lead to a coma and brain death, so quick diagnosis and treatment are critical. Treatment focuses on preventing brain damage. There is no cure.

The cause of Reye syndrome is unknown. Studies have shown that taking aspirin increases the risk of getting it. Because of that, health care professionals now recommend other pain relievers for young patients.

NIH: National Institute of Neurological Disorders and Stroke


Zyrtec Loss Of Consciousness 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 (211)
Pain (145)
Dizziness (139)
Fatigue (138)
Somnolence (133)
Urticaria (132)
Dyspnoea (128)
Nausea (116)
Hypersensitivity (114)
Headache (113)
Insomnia (112)
Depression (105)
Feeling Abnormal (104)
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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