Does medicine contradict the law of natural selection? The main

natural selection is a descriptive law, not a moral one

No, it just changes what things are selected for.

>>8971423
Natural selection occurs regardless of whether humans overcome nature through medicine, so it's not logically a contradiction of the law of natural selection. If you mean to ask whether natural selection applies when medicine is used to direct our own survival depends if you consider "natural" to pertain only to incidental factors, such as the disease agent's own viability, the chance that a human being has a favorable genetic adaption or would acquire a genetic adaption to the disease agent, the degree that a human being can spread a genetic disease through subsequent generations, etc.

Intellect itself can be argued to be an adaptation to challenges presented by nature, which, when applied to medicine, allows us to overcome genetic and acquired diseases, therefore I don't see the direction of our own survival through medicine to be a contradiction.