Hello and welcome to Healthcare Magic. Thanks for your query.
LCZ (Levocetrizine) and Allegra
) are anti-allergy
medication which are called "anti-histamines". They act by preventing the release of allergy-mediating chemicals called "histamines"
These anti-allergy medication do not cause any addiction and generally, there would be no necessity to keep increasing the medication as time goes by. However, usually, these medication are prescribed for short periods
only, with the hope that the body will slowly get 'sensitized' or adjusted to the allergen and will be able to tackle it without the necessity of the medication.
Both LCZ and Allegra are usually prescribed as once daily doses, because their duration of action is roughly one day - i.e. the optimum effects of the medication last for one day. But in your case, you mention that one tablet is effective for 4 days. If you are comfortable taking Allegra once a day, then it should be quite okay. There is no hard and fast rule that they have to be taken daily.
Wish you all the best.
Dr. Sheeba Stephen