Medication is either a medicine or a regular dosage of drugs and medicines that a person takes for their health.
In the sense of the second, many agents of the PPC should be taking medication of some form or another on a regular basis; however, most of these agents, such as Agent Kayleigh Leonard, habitually do not take their pill cocktails, which helps raise the general level of insanity in HQ.
Sometimes fanfic writers forget to take their meds, too. This can lead to crackfic or badfic. Too much medication or not enough medication can lead to the latter being mistaken for the former. Sometimes it leads to the former being mistaken for the latter, but this is common even among people who aren't happy with their Claritin, Nyquil, and Ritalin party mix.
The PPC does not advocate using medications in a manner inconsistent with their labeling. The PPC has not been evaluated by the FDA and is not intended to diagnose, treat, cure, or prevent any illness.