First, look at the instructions of two kinds of roxithromycin capsules. If the ingredients and specifications are the same, it is no problem to mix them. If the specifications are inconsistent and the ingredients are the same, take them separately according to the instructions, and there is no problem in mixing them. If the ingredients are inconsistent, consult a doctor.
And whether you can eat roxithromycin depends on the cause. Antibiotics can't be eaten casually, although roxithromycin is less allergic!