There are many drugs that are stronger than morphine including hydromorphone and oxymorphone but the strongest opiate which is known is Carfentanil. It is a synthetic analog of fentanyl and is the strongest known opiate. It is approximately 10,000 times more potent than morphine and 5000 times stronger than heroin. In fact, heroin which is laced with Carfentanil may lead to overdose and respiratory depression and may prove to be rapidly fatal. It is often illegally smuggled into the United States and has the potential to be used in bioterrorism as a weapon of mass destruction