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Claritin vs Zyrtec vs Allegra, a side effect and effectiveness comparison for a male patient aged 44

This is personalized comparison of Claritin vs Zyrtec vs Allegra for a male aged 44. The study is created by eHealthMe based on reports from FDA and social media.

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On Apr, 10, 2014: 3,046 male patients aged 39 who take the drugs are studied in Claritin vs Zyrtec vs Allegra

Information of patient in study:

GenderAgeReason for the drug

Drugs to compare:

Claritin loratadinenot specified
Zyrtec cetirizine hydrochlorideMcneil Consumer
Allegra fexofenadine hydrochlorideSanofi Aventis Us

eHealthMe real world results:

For males aged 39 (±5):

Most common side effects:

(click on each outcome to view in-depth analysis, incl. how people recovered)
ClaritinZyrtec (Mcneil Consumer)Allegra (Sanofi Aventis Us)
DepressionFatigue (feeling of tiredness)Fatigue (feeling of tiredness)
Nausea (feeling of having an urge to vomit)DepressionHeadache (pain in head)
Insomnia (sleeplessness)Asthenia (weakness)Chest Pain
DizzinessHeadache (pain in head)Depression
Headache (pain in head)AnxietyNausea (feeling of having an urge to vomit)
Drug IneffectiveDyspnoea (difficult or laboured respiration)Drug Ineffective
Back PainNausea (feeling of having an urge to vomit)Dizziness
Pyrexia (fever)DizzinessDyspnoea (difficult or laboured respiration)
Asthenia (weakness)Drug IneffectiveBack Pain
AnxietyPyrexia (fever)Asthenia (weakness)

Most common side effects experienced by people in long term use:

(click on each outcome to view in-depth analysis, incl. how people recovered)
ClaritinZyrtec (Mcneil Consumer)Allegra (Sanofi Aventis Us)
Emotional DisorderLipodystrophy (abnormal or degenerative conditions of the body's adipose tissue)Anxiety
Dyskinesia (abnormality or impairment of voluntary movement)Syncope (loss of consciousness with an inability to maintain postural tone)Rotator Cuff Syndrome (a spectrum of conditions affecting the rotator cuff tendons of the shoulder)
Alanine Aminotransferase IncreasedHydronephrosis (water inside the kidney)Headache (pain in head)
Erection Difficulties - Age RelatedPerianal Fungal InfectionBlood Cholesterol Increased
Hallucination, Visual (seeing things that aren't there)Insomnia (sleeplessness)Pulmonary Embolism (blockage of the main artery of the lung)
Hypothermia (body temperature drops below the required temperature for normal metabolism and body functions)Muscle Cramps (painful sensations caused by muscle contraction)Pleural Effusion (water on the lungs)
InfectionHaematuria (presence of blood in urine)Diarrhoea
Hallucination, Auditory (perceiving sounds without auditory stimulus)Drug DependencePneumonia
Cardiac ArrestSleep DisorderDepression
Insomnia (sleeplessness)Pruritus (severe itching of the skin)Intentional Overdose

Drug effectiveness:

not at allsomewhatmoderatehighvery high

How to use the study: print a copy of the study and bring it to your health teams to ensure drug risks and benefits are fully discussed and understood.

Related topic: Allegra, Allergies, Claritin, Zyrtec

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Drug effectiveness in real world:

Alternative drugs:

Side effects in real world:

On eHealthMe, Claritin (loratadine) is often used to treat allergen. Zyrtec (cetirizine hydrochloride) is often used to treat allergies. Allegra (fexofenadine hydrochloride) is often used to treat allergies. Find out below the conditions the drugs are used for, how effective they are, and any alternative drugs that you can use to treat those same conditions.

What is the drug used for and how effective is it:

Other drugs that are used to treat the same conditions:

Recent related drug comparison:

NOTE: The study is based on active ingredients. Other drugs that have the same active ingredients are also considered.

WARNING: Please DO NOT STOP MEDICATIONS without first consulting a physician since doing so could be hazardous to your health.

DISCLAIMER: All material available on is for informational purposes only, and is not a substitute for medical advice, diagnosis, or treatment provided by a qualified healthcare provider. All information is observation-only, and has not been supported by scientific studies or clinical trials unless otherwise stated. Different individuals may respond to medication in different ways. Every effort has been made to ensure that all information is accurate, up-to-date, and complete, but no guarantee is made to that effect. The use of the eHealthMe site and its content is at your own risk.

You may report adverse side effects to the FDA at or 1-800-FDA-1088 (1-800-332-1088).

If you use this eHealthMe study on publication, please acknowledge it with a citation: study title, URL, accessed date.

Related studies

- Allegra side effects
- Claritin side effects
- Zyrtec side effects


Related conditions

- Allergies



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