Yes, it is quite possible that your grandson is experiencing one of the Singulair’s side effects.
The side effects may occur anytime and I don’t know about
fever but others that are not so troublesome usually disappear once the body gets used to the drug.
Considering your grandson is having fever, I would call a doctor and consulted him and asked whether the drug should be discontinued or the
dosage lowered, etc
There aren’t any other side effects, are there?
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