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I'm not a doctor, but what they told you above is on the right track. The truth is that the safest thing is to check exactly what the prescription or the medicine bottle says, because the doctor already took your kid's age and all that into account when prescribing it. I've had to give antihistamines to my nephews and it always happens to me that I want to stick my nose in where I shouldn't instead of trusting what the doctor says, so it's better you don't improvise with the doses.
Loratadine is generally taken once a day, but that depends on your son's age and the specific dose the doctor prescribed. How old is he? The best thing is to follow exactly what the prescription or medicine bottle says, because that's where the correct dose for his weight and age is. If you have any doubts, call the pharmacy or check again with the doctor, it's better to be sure about these things.
I would follow exactly what the prescription the doctor gave you says, because the dose can vary depending on your son's age and weight. The normal thing is once a day, but some cases need more, so the best thing is not to improvise and follow the medical instructions to the letter. If you have any doubts after reading the prescription, you can call the pharmacy or the pediatrician's office to confirm it for you, they're used to these kinds of questions anyway.
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