Antifolates are drugs that antagonise (that is, block) the actions of folic acid (vitamin B9). Folic acid`s primary function in the body is as a cofactor to various methyltransferases involved in serine, methionine, thymidine and purine biosynthesis. Consequently antifolates inhibit cell division, DNA/RNA synthesis and repair and protein synthesi.... Found on http://en.wikipedia.org/wiki/Antifolate
A substance that blocks the activity of folic acid. Antifolates are used to treat cancer. Also called folate antagonist. Found on http://www.cancer.gov/dictionary?expand=A