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Doctor insights on: Zyrtec 24 Hour Side Effects

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Dr. John Chiu
563 doctors shared insights

Cetirizine (Definition)

Ceftirizine is the generic name of an antihistamine previously marketed under the ...Read more


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Any bad side effects of zyrtec (cetirizine)?

Any bad side effects of zyrtec (cetirizine)?

Sleepiness: 10% of the patients will experience sleepiness.Best time to take it is at bedtime to cut down this side effect. ...Read more

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What are the side effects of zyrtec (cetirizine)?

What are the side effects of zyrtec (cetirizine)?

Minimal side effects: The side effects of zyrtec (cetirizine) are minimal compared to old antihistamines. Very small incidences of headache, sleepiness, abdominal pain, dry mouth, and nose bleeds have been reported. ...Read more

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What are the side effects of zyrtec, (cetirizine) if any?

What are the side effects of zyrtec, (cetirizine) if any?

Sleepiness: The major side-effect of zyrtec (cetirizine) is sedation - sleepiness, fatigue, and slowed reaction time. This occurs in 1 out of 10 or 1 out of 12 users. Compare to Benadryl (diphenhydramine) 1 of 3 users or clariting 1 in 50 users. Also occasionally reported are stomachache, headache, diarrhea, constipation & dry mouth & throat. In older men zyrtec can sometimes cause difficulty with urination. ...Read more

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My brother took too many zyrtec (cetirizine) tablets.Side effects?

My brother took too many zyrtec (cetirizine) tablets.Side effects?

Drowsiness: Most likely will be drowsy. There can be respiratory suppression, at which point he would need to been evaluated in an emergency center. However, call poison control in your area to see if they have any other suggestions. Otherwise effects will wear off over time. ...Read more

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Side effects of using zyrtec (cetirizine) for hives?

Side effects of using zyrtec (cetirizine) for hives?

Read PI: All medications that are available have included a package insert that describes what the medication is and its side effects. ...Read more

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Long term side effects of effects of anti allergics (zyrtec)?

Long term side effects of effects of anti allergics (zyrtec)?

None: There have been no reported long-term side effects from use of zyrtec (cetirizine) in a trial involving toddlers and children with eczema, who were treated with zyrtec (cetirizine) for for years daily, and then there was an extension out to six years of total treatment. ...Read more

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What are the side effects of zyrtec (cetirizine) and how can I prevent them?

What are the side effects of zyrtec (cetirizine) and how can I prevent them?

Effects vs sides: The most common side effect is sedation, about 13%. Sometimes taking before bedtime helps, but some people still are affected and need a less sedating antihistamine. Refer to the drug information label for other side effects. ...Read more

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Are there side effects of mixing the medicine zyrtec (cetirizine) with alcohol?

Are there side effects of mixing the medicine zyrtec (cetirizine) with alcohol?

Possibly: Alcohol causes sedation (sleepiness). Zyrtec (cetirizine) can cause sedation (not in everyone, but in many). Mixing the two can compound the effect - making you extra sedated. Extra sleepy. But then that can translate to greater impairment in judgement. Meaning - not thinking clearly.... ...Read more

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Are there any side effects to taking Zyrtec, (cetirizine) lysozyme, kaloba long term in children 2-4 years old?

Are there any side effects to taking Zyrtec, (cetirizine) lysozyme, kaloba long term in children 2-4 years old?

Yes: There are side effects or potential side effects to all medications, supplements, vitamins, therapies, and life in general. A decision to use or not use any treatment is always a risk vs benefit analysis. You should discuss this with your children's doctor. ...Read more

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I think my 2 yr old has allergies. I bought childrens zyrtec (cetirizine) but im afraid of side effects. Is it more common for insomnia?

I think my 2 yr old has allergies. I bought childrens zyrtec (cetirizine) but im afraid of side effects. Is it more common for insomnia?

Not really: Zyrtec (cetirizine) is able to cross into the brain and effect the thinking process.Most kids or adults are actually sedated by its actions, which is why they advise giving it in the evening. A percentage of folks will have the opposite effect, probably 1/20, which could interfere with sleep.The response is unique to each & consistent.You can try it once and see if the kid gets hyper.If not it should work fine ...Read more

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How common is urinary retention from chronic use of zyrtec (cetirizine)? Any other side effects? I was prescribed to take it everyday but doc never mentioned this

How common is urinary retention from chronic use of zyrtec (cetirizine)? Any other side effects? I was prescribed to take it everyday but doc never mentioned this

Not common: Any antihistaminic can cause urine retention, but it's a rare side effect, other side effects such as dry mouth, somnolence r more common, usually common side effects r written on the patient info leaflet dispensed with drugs, or on boxes for over-the-counter meds. ...Read more

Dr. John Chiu
543 doctors shared insights

Zyrtec (Definition)

Zyrtec is a non-sedating antihistamine which is a kind of antihistamine type drug (common ...Read more