Is children's Advil (ibuprofen) safe to mix with similasan cough & mucus? My 2 year old has a fever and I was wondering if that's safe to mix?

Try less. Otc cold remedies are not recommended and mixing can be even more dangerous. Treat the fever with advil or tylenol (acetaminophen) and consult your pediatrician for a flu culture and recommendation for additional treatment.
Medicine Mixing. The two are safe to mix. There is no interaction between the two. Be careful with reading labels to make sure you don't have any duplication of medications or medication categories.