Doctor insights on:
Zyrtec 24 Hour
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
Can you take sudafed 24 hour at the same time as zyrtec (cetirizine) 24 hour. My face is getting numb by taking both. Why would that be?
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?
Yes: No problem.Get a more detailed answer ›
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
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
If I normally take a 24 hour zyrtec everyday, can I take it and a benadryl (diphenhydramine) at the same time for allergy eyes?
I took a Claritan DM this morning around 10:00. It has helped a little but I still have runny nose, itchy eyes, and cough. I have a 24 hour Zyrtec?
Rx: I think that you should select the medication that has the best result for your symptoms. ...Read more
Can you take more than one 24 hour allergy medicine a day? Like Claritin, Zyrtec or Allegra. Could you also do that in addition to a nasal Spary like
Yes: For non-sedating AH, you can take up to 4x a day. ...Read more
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
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
Gave my small 11 mth old 2.5ml of zyrtec (cetirizine). An hour later my husband gave him a 2nd 2.5ml not knowing I had. Will he be alright?
Yes: He may be extra sleepy, but should be fine. ...Read more
Can I take my second dose of Zyrtec (cetirizine) D in 8 hours if I need it, opposed to the recommended 12 hours? Took it at 10am would like to take it now 7:30pm
Should be Ok: Try then to change to the recommended schedule as soon as it seems to be working ...Read more
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
I took 10 mg. Zyrtec (cetirizine) about 7 hours ago and wonder if I can take a dose of NyQuil before going to bed.
YES: However the use of both products should not exceed the doses you are using and you may have increased sedation. ...Read more
I took my Zyrtec about20 hours ago. I want to take it now so that when I wake up, my allergies will be better. Is that okay?
Go for it: This would be a reasonable schedule and not get you into any trouble. ...Read more
Is it okay to take a 24 hr zyrtec in the am and a 12 hour allegra (fexofenadine) at night? The zyrtec alone hasn't been working well enough lately.
Zyrtec (cetirizine) is only effective for 10 hours for me. Is there any other medication I can take at night to help my allrrgies along with zyrtec (cetirizine) in the morning?
More zyrtec (cetirizine) for nose: zyrtec (cetirizine) can be taken safely more than the package states. It can cause some drowsiness in about 13% of people; that's why the low dose of ten mg is recommended. The simplest answer to your problem is to simply take another zyrtec (cetirizine) at night, if your morning dose doesn't last all day. ...Read more