system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why, as adults we are only prescribed pills for medication, when we're fully capable of taking liquids?
gpt
Liquids go bad much (_much_) faster than pills because the liquid (usually water) provides an active breeding ground for germs.  Most of the long-shelf-life liquid medicines out there have a natural preservative in them:  alcohol (next time you're in the drug store aisle, look at the ingredients on that bottle of nyquil).

In the case of medicines, they don't want to pack in many preservatives because the chemicals could react negatively with the medicine.