Loratadine or cetirizine?
Cetirizine is marginally more effective for some people; loratadine is marginally less likely to cause drowsiness. Both are reasonable, and trying the other is sensible if one disappoints.
Is it safe in pregnancy?
It has the most reassuring pregnancy data of the antihistamines, and is usually the first choice. Still worth mentioning to whoever is caring for you.
Can I give it to my child?
Yes, from age 2 as syrup, dosed by weight. Follow the packaging carefully.
Why is it not working for my blocked nose?
Because antihistamines are weak for congestion. A steroid nasal spray is the treatment for that, and it is the missing piece in most disappointing hay fever treatment.
Can I drink alcohol?
Loratadine does not add meaningfully to alcohol's sedative effect, unlike older antihistamines.