Hi, I had gone through your question and understand your concerns. Naproxen is a NSAID medicine, used for relief of pain , in high doses it may cause gastritis, and effect on liver and kidney . But if he had sucked on them only , I mean if pills are intact you need not concern, as most pills are coated and absorption with just sucking is unlikely . So if pills are intact you need not do anything , take care in future . Hope this answers your question. If you have additional questions then please do not hesitate in writing to us. • DISCLAIMER: - All the information provided here is for information purpose only , it is not a substitute for the advice of a physician after physical examination , it is not intended to replace your relationship with your doctor. This information in no way establishes a doctor-patient relationship. Before acting anything based on this information do consult your doctor. I recommend that online users seek the advice of a physician who can perform an in-person physical examination