system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: If anti-histamines work by suppressing the immune system to avoid allergic reactions, then why do we not see an increase in infectious diseases such as the cold or flu in those who regularly take them?
gpt
Anti-histamine itself is as its name: it's anti 'histamine'. The histamine is a chemical produce by immune system. The medicine will directly suppress reaction of histamine that result in allergic reaction. It doesn't affect immune system. And because there're many ways that the immune system fight with pathogens, the suppression of histamine won't affect immune system operation that much.