How Long Does It Take Zyrtec To Build Up In

Posted on Sun, 9 Jun 2019

Medically reviewed by Ask A Doctor - 24x7 Medical Review Team

Sun, 9 Jun 2019 Answered on

Last reviewed on

Question : How long does it take Zyrtec to build up in your system and be fully effective?

Answered by Dr. Drkaushal85 (4 hours later)

Brief Answer:
It should start its effect since the very first day.

Detailed Answer:
Thanks for your question on 'Ask A Doctor' forum.
I can understand your concern.

Zyrtec is having Cetirizine.
It is an antihistamine drug.
It will start its effect from the first dose.
So it will be fully effective from the first dose only.
No, build up thing for this drug.
Whenever you take it, it gives you effect.

If you want to take it for a longer duration (especially for allergic conditions), it will give full effect from the first dose.

Hope I have solved your query.
I will be happy to help you further.

Wish you good health.
Thanks.

Note: For further information on diet changes to reduce allergy symptoms or to boost your immunity, Ask here.

Above answer was peer-reviewed by : Dr. Arnab Banerjee