There are no other ingredients in zyrtec; however, zyrtec-d, a separate formulation, has in addition to the antihistamine a decongestant. Read more See 1 more doctor answer It's best to adhere to the dosing recommended.It would be hard to overdo it with the zyrtec , 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 ? Read more See 1 more doctor answer Natural treatments are medications too.
I would think you need to talk with your doctor about other options to achieve safe allergy control. Usually not as well studied or characterized for benefit and safety as those approved by the fda.
I don't know of any natural antihistamines per se but butterbur has been reported to have benefits.
This is a common side effect of Zyrtec, but it is different for everyone.
If Zyrtec makes you drowsy, you could try the other 2 common anti-histamines instead - Allegra or Claritin. Read more Which drug is better fora specific patient cannot be predicted.
They will not necessarily make him feel any better than using a single medication and runs the risk of overdosing/other adverse effects. Read more See 2 more doctor answers Zyrtec *is* an antihistamine.
Zyrtec is an antihistamine used for treating allergy symptoms and itching due to hives.