Can you break a Valium in half?

It can, but it will not alter it's effect. The best effect will come from swallowing it whole. It is very uncomfortable, to take nasally and you would unlikely feel it at all. Injecting it will give not intensify it either but could lease to blindness or a stroke if done regularly. Cutting a tablet in half and swallowing it is OK. Crushing it and putting in Applesauce will give the same effect as swallowing.