I am on meloxicam and celabenzaprine a muscle relaxer is it safe to take amoxicillin while on them pills?

Maybe. Amoxicillin and Meloxicam together may increase blood levels of the other, so if you are at higher doses of either drug, you may be more likely to have side effects. All drugs have side effects, so your final check should be with the doctor giving you the prescriptions and your pharmacist.