Hi!
If this pill is having 2 mg (weight), you can give it to your son/daughter every 4 hourly.
If this pill is having 4 mg , you can repeat it after 8 hour.
Have a speedy recovery.
You can give him maximum of 2 or 3 tablets in a day. But keep a watch if he is drowsy you need not repeat the dose. contact allergist if he worsens because he may need adrenaline
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Disclaimer:
These answers are for your information only and not intended to replace your relationship with your treating physician.