Penoxycyline
Penoxycyline is a medical drug in RimWorld which was introduced in Alpha 16, and succeeds Malari-Block. Unlike its predecessor, Penoxycline blocks against 3 diseases: malaria, sleeping sickness, and the dreaded plague - whereas Malari-block only blocked against malaria.
Like Malari-Block; Penoxycyline can either be purchased from traders, or crafted at a drug lab - but for a mere 3 neutroamine as opposed to the 5 which Malari-block took. However, in order to make Penoxycyline, you need to have penoxycyline production researched, which in turn requires drug production, and Neutroamine has to either be purchased from traders, or found in cargo pods.
Penoxycline can be administered if one has one of the diseases it protects against, and doing so will boost the immunity by 35%; greatly improving their chances of survival.