<prompt> All of the following are adverse effects of sodium valproate except:Weight gainAlopeciaLiver damageOsteomalacia  <response>: Osteomalacia is not a side effect of sodium valproate. However, Phenytoin on the other hand can cause this problem. Other side effects include weight gain, tremors, fulminant hepatitis and polycystic ovarian disease. REF: GOODMAN AND GILLMAN 13TH ED. 