Among these drugs are Colchicine or Colchimid that depolymerizes microtubules and blocks mitosis, Cytoclasin B, D or E etc which inhibit addition of actin monomers thus preventing cytokinesis, Vinblastin or vincristine, or taxol which stabilize microtubules thus preventing mitosis. Poisons can control cell division. Many types of animal cells grow only when in the presence of a particular protein or growth regulator. PDGF is one example that promotes fibroblasts. FGF-1 is another that promotes development of endothelial cells, or TCGF which is a T cell growth factor.
Growth factors are important in regulating many types of cell division.
When cells get to touching each other they stop growing. Same with a cut, when it fills in the cells stop proliferating. Cell density is an important controlling factor. Again, especially when in vitro, normal animal cells are dependent on having a substrate to attach to. They will not divide if in a liquid culture.