Yes. I've put Calpol in my child's drink before when they didn't want to take the medicine on its own.
A bit more:
You first need to check with your doctor or pharmacist to make sure your child can have that particular type of juice with his or her particular medication. Some juices, especially the acidic ones, can interferre with certain medications. And some meds, especially certain antibiotics, cannot be taken with dairy products.
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