I've had to give it to both of my kids. They both react to bites really badly. Dd whole arm swelled from just a mozzie bite. She was only 13 months at the time but a special dose was given based on weight and it was given over three doses instead of one big dose.
It made both my kids drowsy but they didn't sleep any longer, they just got grumpy.

My aunt used to give it to both her kids every single night, although that was 25 years ago. My ex bil used( I say used because i wouldn't have a clue now that he's not around) to give to my nephew everyday, even for naps! Terrible!

I don't think it's a drug to be given willy-nilly but, there sometimes is a need when a child isn't sleeping and all other options have been explored.