It should be taken at the same time(s) everyday.
When testing was done on humans with excessive dosages no additional adverse reactions were experienced. Tell your doctor of certain pre-existing conditions like kidney disease and pregnancy. It may be taken by adults and children above the age of two years old. Extending the period between doses may cause allergic symptoms to materialize. Fexofenadine does not easily traverse the blood-brain barrier, and subsequently will not induce sleepiness. Therefore, you will need to take it even when symptoms are no longer apparent. Fexofenadine should not be taken with fruit juices such as orange, grapefruit, or apple juice as the acidic content may interfere with the functioning of the pill.