Can you switch to losartan (Cozaar) or another medication to save money? Though valsartan is the generic version of Diovan itâs still expensive. Both valsartan and losartan are ARBs (angiotensin receptor blockers); out of the ARBs, losartan has been around the longest. Here are some simple things to know if youâve been told to switch your ARB to losartan: