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Parepin is the brand name for a man-made [[Drugs in Year Zero|drug]] that is also sometimes referred to by its generic name, zeridine. Developed in a groundbreaking partnership between a major pharmaceutical company and the National Institute of Health, Parepin is a complex drug that bootstraps the immune system. Parepin is a revolutionary drug made possible by the advances in medical technology from the study of AIDS and other immune diseases. While antibiotics target bacteria and antiviral drugs target viruses, Parepin is not designed to combat a specific disease or set of diseases. Instead, it makes the body better able to combat all disease.

In the [[Year Zero Research|World Of Year Zero]], Parepin has been introduced into water sources all over America. The government claims it is to increase the citizens' immune system and protect them from biological terrorism. Apparently the drug may do a lot more than just boost the immune system. Apparent side effects are: an alteration of dopamine and serotonin levels (Drugs like Cocaine, Meth, and [[Opal]] do this, while no immune system booster, anti-biotic, or anti-viral does), muscle spasms, inability to reach orgasm, complacency, dulling of emotions, to name a few. However, studies showed that it made no difference in combatting diseases and providing protection in the event of a terror attack, leading some to conclude that the real reason it was added to the nation's water supply was to keep the populace complacent with their environments.