Do not foward unverified information. Always check with reliable sources,whether online or offline. We must also determine what kind of information we are reading, be it comprehensive or biased, consistent or different, current or outdated.
He should also not forward this email in case others get spammed or believed; cheated and fall for the information.
He should not open the file in case of computer virus. He should also mark the email as spam in case the opposite party send the information again.
He should not buy the medicine. It might be scam,just to cheat his money. Even if there is the medicine, there is a high chance that it is unreliable. It might just be crap.