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Hypersensitivity and Zyrtec

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Hypersensitivity Symptoms and Causes

An allergy is a reaction by your immune system to something that does not bother most other people. People who have allergies often are sensitive to more than one thing. Substances that often cause reactions are

  • Pollen
  • Dust mites
  • Mold spores
  • Pet dander
  • Food
  • Insect stings
  • Medicines

Normally, your immune system fights germs. It is your body's defense system. In most allergic reactions, however, it is responding to a false alarm. Genes and the environment probably both play a role.

Allergies can cause a variety of symptoms such as a runny nose, sneezing, itching, rashes, swelling, or asthma. Allergies can range from minor to severe. Anaphylaxis is a severe reaction that can be life-threatening. Doctors use skin and blood tests to diagnose allergies. Treatments include medicines, allergy shots, and avoiding the substances that cause the reactions.

Check out the latest treatments for hypersensitivity

hypersensitivity treatment research studies

Zyrtec clinical trials, surveys and public health registries


Find Drug Side Effect reports



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)
Injury (39)
Withdrawal Syndrome (39)
Pulmonary Embolism (38)
Irritability (36)
Pyrexia (36)
Vomiting (36)
Abdominal Pain Upper (35)
Hallucination (34)
Fall (34)
Deep Vein Thrombosis (34)
Asthma (33)
Diarrhoea (31)
Malaise (30)
Palpitations (30)
Suicidal Ideation (29)
Blood Pressure Increased (28)
Abdominal Pain (28)
Cough (27)
Disturbance In Attention (27)
Pain In Extremity (27)
Dry Mouth (26)
Contusion (26)
Chest Discomfort (26)
Anger (25)
Cholecystitis Chronic (25)
Weight Increased (25)
Cholelithiasis (24)

➢ More


Common Meds

Abilify (10132)
Adderall (1304)
Amlodipine (6664)
Amoxicillin (4387)
Benadryl (1568)
Celebrex (12876 )
Celexa (1342)
Cialis (2975)
Cipro (8580)
Citalopram (7792)
Crestor (18839)
Cymbalta (14373)
Doxycycline (1757)
Effexor (7289)
Flexeril (435)
Flomax (2177)
Fluoxetine (4261)
Gabapentin (4593)
Hydrocodone (2469)
Ibuprofen (8222)
Lantus (10968)
Lexapro (3499)
Lipitor (17769)
Lisinopril (8919)
Lyrica (27148)
Medrol (650)
Mirena (41254)
Mobic (957)
Morphine (5356)
Naproxen (538)
Neurontin (6501)
Oxycodone (4438)
Pradaxa (13372)
Prednisone (5926)
Prilosec (2631)
Prozac (1954)
Seroquel (27216)
Simvastatin (8348)
Synthroid (4452)
Tamiflu (5585)
Topamax (3748)
Tramadol (5054)
Trazodone (1458)
Viagra (5394)
Vicodin (1153)
Wellbutrin (6324)
Xanax (2847)
Zocor (5718)
Zoloft(6792)
Zyrtec(1669)

Recent Reviews

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

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?

Have you had him checked for P.A.N.D.A.S which is a syndrome related to strep throat. One major symptom can be sudden onset of Tourette's. ALso can cause OCD, depression, and other psychiatric conditions. My son has it. SOme doctors don't believe in

I have a 12 year old son who took Zyrtec for year-round allergies. He now has tourettes syndrome and westrongly feelthe Zyrtec played a role in this health issue. I started searching the web for info regarding

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.

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?

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

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 a

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.

I had a severe reaction to iv cefazolin that was not taken seriously by er nurse and failed to completely subside. i progressively became weaker and ill and believe that it is the cause of the autoimmune disorder and hypersensitivity vasculitis that

Took imigran nasal spray once for serious migraine went to bed the whole of my right side collapsed my right leg does not work i get exqiste hypersensitivity from my knee down my right shoulder has been badly damaged the muscles right side of my back

Hypersensitivity Clinical Trials and Studies

Treatments might be new drugs or new combinations of drugs, new surgical procedures or devices, or new ways to use existing treatments. The goal of clinical trials is to determine if a new test or treatment works and is safe. Clinical trials can also look at other aspects of care, such as improving the quality of life for people with chronic illnesses. People participate in clinical trials for a variety of reasons. Healthy volunteers say they participate to help others and to contribute to moving science forward. Participants with an illness or disease also participate to help others, but also to possibly receive the newest treatment and to have the additional care and attention from the clinical trial staff.