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Doctor insights on: Zyrtec 24 Hour

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Dr. John Chiu
569 Doctors shared insights

Cetirizine (Definition)

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


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Can I take a 12 hour Alegra D now at 4:30pm when I took a (plain) Zyrtec (cetirizine) (24 hour) at midnight. Will I feel drousey?

Can I take a 12 hour Alegra D now at 4:30pm when I took a (plain) Zyrtec (cetirizine) (24 hour) at midnight. Will I feel drousey?

Antihistamine doses: Greetings. The dosing of your meds should be ok. We commonly double the dose of antihistamines for better allergy coverage. I wouldn't recommend continued use of these meds in this way but on occasion this will be ok. The decongestant and Zyrtec may counteract each' side effects. You probably won't have the am " hangover " effect. Good luck and consider a steroid nasal spray for continued use. ...Read more

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Messed up Zyrtec schedule - took one 24 hour 10mg this morning around 7:00am and just accidentally took another at midnight same day. Is this bad?

Messed up Zyrtec schedule - took one 24 hour 10mg this morning around 7:00am and just accidentally took another at midnight same day. Is this bad?

No, but: It may cause drowsiness, so don't drive or operate machinery if this happens. You can go back to schedule tomorrow at 7 am, or change it to midnight (s), best wishes ...Read more

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Is it safe to take another 24-hour zyrtec (cetirizine) antihistamine if there's still about 8 hours left before the previous one wears off?

Is it safe to take another 24-hour zyrtec (cetirizine) antihistamine if there's still about 8 hours left before the previous one wears off?

Follow dosing: It's best to adhere to the dosing recommended. It would be hard to overdo it with the zyrtec (cetirizine), the way you are suggesting, but it begs the question- how well does the rx work, if you want more before the proper dosing interval? I would think you need to talk with your doctor about other options to achieve safe allergy control. Sometimes more than one rx is necessary. ...Read more

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Can you take a night time sleep-aid diphenhydramine with 24 hour zyrtec (cetirizine) equivalent in your system?

Can you take a night time sleep-aid diphenhydramine with 24 hour zyrtec (cetirizine) equivalent in your system?

Yes, but caution: Zyrtec (cetirizine) is a minimal sedating antihistamine while Diphenhydramine (benadryl) is a first generation antihistamine with significant drowsy side effects. There may be carry over effect from diphenhydramine. Avoid drinking alcohol. Consider another sleep aid if this is a persistent problem. ...Read more

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What happens if you take more then one cetirizine in a 24 hour period? Does it work better?

What happens if you take more then one cetirizine in a 24 hour period? Does it work better?

Possible side effect: Cetirizine is only recommended to be take once every 24 hours. Taking more than the recommended dose can be harmful in terms of increasing the chances of side effects. If your allergy symptoms are not relieved by taking over the counter anti-histamines then talk with your physician to determine additional or alternative therapies. The symptoms may be something other than allegies. ...Read more

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Can I take 10 mg zyrtec (cetirizine) after 12 hours?

Can I take 10 mg zyrtec (cetirizine) after 12 hours?

Not advised: Zytrtec is fda approved for only once a day dosing. See an allergist for additional symptom relief. ...Read more

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Is it OK to take another zyrtec (cetirizine) after about 15 hours? It makes me lazy so I want to switch taking it from. Am to pm

Is it OK to take another zyrtec (cetirizine) after about 15 hours? It makes me lazy so I want to switch taking it from. Am to pm

Be patient: Zyrtec (cetirizine) is designed to be a once a day medication - meaning it can effects for almost 24 hours. You are reporting some sedation on it - I would not take tonight and skip the morning dose and start back up tomorrow night. Be careful if taking in alcohol or driving as drowsiness may impair your decision making. May consider trial OTC Nasocort nose spray to help nose congestion and skip the oral meds. ...Read more

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I accidentally took an expired (18 months ago!) Zyrtec pill. Should I take the correct (unexpired) one nowbad well or should I wait 24 hours?

Wait: Medication can lose it's effectiveness past expiration date, but I would not expect it to not be effective at all; especially if only 18 months expired. It will not be harmful at all that you took an expired zyrtec. It will probably still be almost as effective as it was prior to expiration, so I would just wait and take a new one at your normal time the next day. Hope this helps! ...Read more

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Can I take nyquil a few hours after taking zyrtec (cetirizine)?

Can I take nyquil a few hours after taking zyrtec (cetirizine)?

Not recommended: Nyquil has an antihistamine in it and zyrtec (cetirizine) is also an antihistamine. You'll be getting an excessive amount of antihistamine and this is not the best way to take care of your cold/allergy symptoms. ...Read more

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Can I drink after I took an over the counter Zyrtec 7 or 8 hours ago?

Can I drink after I took an over the counter Zyrtec 7 or 8 hours ago?

Likely ok: Although Zyrtec may cause drowsiness in about 10% of the people, this effect should have mostly subsided after 7-8 hrs. As always, be sure that you are alert enough before operating any machinery after a drink regardless of what other medication you might have taken. ...Read more

Dr. John Chiu
549 Doctors shared insights

Zyrtec (Definition)

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