Dear Patient Thanks for contacting HCM. I just want you to know that aleve (naproxen) is a nonsteroidal anti-inflammatory drug (NSAID)and overdose to these medications is very common. NSAID prevent production of prostaglandin and thos prostaglandin helps to protect stomach by increasing mucus and bicarbonate production. Mild to moderate ingestion may manifest with gastrointestinal symptoms such as nausea, vomiting etc (as in your husband case) and electrolyte abnormalities that resolve rapidly with supportive care. I dont know your husband s age and his general health condition so i would suggest you to ask him to contact emergency and have him under observation. Hope this has helped Regards