It is available as 5 mg and 10 mg tablets. If
you are on 5 mg tablets and plain
Zyrtec then
you can take one more tablet but if
you are taking 10 mg dose, then it is not to be taken again.
It is very difficult to precisely confirm a diagnosis without examination and investigations and the answer is based on the medical information provided. For exact diagnosis, you are requested to consult your doctor. Treatment can be started only when the diagnosis is confirmed. I sincerely hope that helps.