Never take expired Valium for any reason, according to the U.S. Food and Drug Administration. The chemical composition of pharmaceutical drugs changes over time and can cause the drug to become either ineffective or potentially dangerous.
Since the 1970's, the expiration date placed on all medication has been used to determine how long the medication is safe for human consumption, according to the FDA. Recent studies suggest that some medications may be both safe and effective well past expiration dates but only under certain circumstances such as proper refrigeration, according to Family Health Guide. Finding an old bottle of pills is a different scenario entirely. Pills that look excessively powdery or are showing signs of separation have already begun to break down to their original chemical components and should be disposed of properly, according to the FDA.